Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3c6b68a086a7e75…

MALICIOUS

PDF

83.3 KB Created: 2021-09-06 14:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a2a8f0fa6e8c44cd3cfb762c64afa33b SHA-1: 9a916b4de1689cb2d937f529b32af82a4c1e71bb SHA-256: f3c6b68a086a7e75073fc6013c8e95f7cdab9424aaf3c2214b899dc82d8138bc
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed for SEO manipulation or to obscure malicious destinations. The presence of embedded JavaScript suggests potential for further malicious actions, such as downloading additional payloads or redirecting the user to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=conceptual+physics+answers+pdf PDF link annotation
    • http://accomplishtheimpossible.com/userfiles_ati/file/dupurelogiwitoma.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/24246748709.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/risumiri.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/46611166674.pdfIn PDF document text
    • https://fallsplat.se/file/79384406555.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/ee9be9f58b4f115c04d2754b2861c500/jotopibofek.pdfIn PDF document text
    • http://airbaankhubon.com/userfiles/file/sekarivupagapojisekunu.pdfIn PDF document text
    • http://nenorm.com/files/files/3248525549.pdfIn PDF document text
    • https://revive.fashion/upload/files/gemegeledu.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c003e73b6e6---92867472323.pdfIn PDF document text
    • http://jonmechina.com/ckupload/files/486837136.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcedfe6bd2---losowugusuvogomumuje.pdfIn PDF document text
    • http://wajl.net/img/file/202171401027.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc11ec5c2a---60653705298.pdfIn PDF document text
    • http://www.asslar.de/downloads/fezalumokepi.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c171c735858---nonetowoxagez.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/61129399173.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160aa6b984676d---31684201668.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/12496779470.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160961018652c9---94331628537.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/rozituwozi.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/e130c2f3ddd8a17722ffe64eeeb7e24e/27355974665.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/69768584494.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecbc2821ca2---zedobemuxoz.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_off0000df32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF744 18052 bytes
SHA-256: 596d354e310886a0df7d4d60140edeb7a35f21ebd503e888552ae49b92ab6e63
font_02_sfnt_off00012604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12604 11048 bytes
SHA-256: bdfaa432906c0a26d99ff7f9218d466924a92723a4244d41e10d8ef4d1da4cd7

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