Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ffd3be0762eb489…

MALICIOUS

PDF

77.6 KB Created: 2021-10-13 10:09:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 90150386bb3d49b4a3f7374a3eeb0b9e SHA-1: 05a75fc88677378dbb9b0e1777e797262237ea9a SHA-256: 9ffd3be0762eb48952db4385d7320219d3470878d64a9d92189426dfb9de610b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating it is a malicious phishing lure, specifically referencing invoice and callback scams. It embeds numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to execute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://smidgel.ru/uplcv?utm_term=factoring+in+financial+management PDF link annotation
    • http://proart.by/media/file/pivufinuvuraf.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/busilorodax.pdfIn PDF document text
    • http://e-district.org/userfiles/file/38710324569.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/wavoguxogupimuninu.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/lapugurajejipixedu.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/18182453726.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/96638646029.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/75429338812.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/nijekaduxamoxevarugerofi.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16154153b46b56---zapob.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109181615202357.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/69301183738.pdfIn PDF document text
    • http://kaies.cn/upfiles/210910130204634467vaacpy.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d95a47c8c---83377771858.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/ce3dfeab414aeb70b316b96923090ab7/guxodamutirebija.pdfIn PDF document text
    • http://reflita.lt/uploads/files/rigad.pdfIn PDF document text
    • http://tion.hu/upload/file/jokixipufafurudejaxunadaw.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/1952c4diq8ind27q5cdg3th36n/64924742626.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/19099379214.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/96109915516.pdfIn PDF document text
    • http://thaiurethane.com/userfiles/file/90269850858.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/80073124764.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_off0000ca70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA70 10488 bytes
SHA-256: 96c1e19711ab13000d0f2f3df27fda6b17e71cc86e96ffd9b45dbb9eb332a3f3
font_01_sfnt_off0000e242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE242 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA54 18212 bytes
SHA-256: b5c2775a48275569f356f5bdb283fa3713c30f93a0d285fbadd911205b1ff1d8

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