Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d71fb9ea908cc66…

MALICIOUS

PDF

84.7 KB Created: 2021-07-05 07:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 04c0394b78ed5e3c02fcd1177bf79ff4 SHA-1: aa01ae05ee87ef42fdc2b0a4fa3e9f188fcde697 SHA-256: 9d71fb9ea908cc6657acc558a0a1cefe9174c6389d0920f6037f0483c2792a70
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document impersonates the USPS brand, a common lure for phishing or malware delivery. It contains numerous links, many pointing to compromised WordPress sites, and one external URI to 'allytemp.ru' which is likely malicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead the user to a credential harvesting page or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://allytemp.ru/uplcv?utm_term=how+to+change+the+address+your+car+is+registered+at.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://allytemp.ru/uplcv?utm_term=how+to+change+the+address+your+car+is+registered+at PDF link annotation
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608223ae2131b---xibenaxinebofolixo.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c021dadb76c---8894328729.pdfIn PDF document text
    • https://stayatrosetta.com/wp-content/plugins/super-forms/uploads/php/files/ed10qhn7skouclii4ghg3123bi/malatujetazatap.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff8862ea20---xowekalabuzujozuk.pdfIn PDF document text
    • https://jetaime-shop.com/files/15940944707.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/ccb3ceb9764dcd4621b1e71b71a1c2c6/49388030079.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/vvalktr2ot3su6q24k4im5jqf7/90470931680.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c6379c19216---tufuzeloribokimip.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/lidomawonemurepex.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/7554cc43a3165b5831198c8363156a4a/dukozamusipurifumirixi.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/senumidub.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830f20dc88d---44479320291.pdfIn PDF document text
    • https://ortechindustries.ca/ci/userfiles/files/desudonenefogufemex.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/fipenudus.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/zaruwifanigagu.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/2c2defd5b506a54663aebd553a309a38/tirezavobubuwi.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/bc2b97ba16488aa74d37c40c9db6cc6e/gapewoguzoginerizu.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16078212734d51---jogapojixivoz.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/271898752.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/434d300b88963def3bbd90958ff3cf8f/vonobilure.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/34509559066.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/83655049400.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/5rvupq8p2mfudvq36ui0dfaoej/68769185869.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/89876965111.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///vulofigitepuviboxomipo.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/30048383661.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/16337634797.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F5 10896 bytes
SHA-256: 7e224e35ace97eda970365700567d49431dad7b75dfd48477dfd66268d86a26b
font_01_sfnt_off000100f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001190b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190B 16672 bytes
SHA-256: b4022427fd0d11b1122fec383c559cd27a8ecac78244d0fa0cf4710465bf0260