Malicious PDF — malware analysis report

Static analysis result for SHA-256 6887dbecb38a50d2…

MALICIOUS

PDF

121.7 KB Created: 2021-08-05 05:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b2a443683c768cbd3ad511510eeaaa9a SHA-1: 6a8f01c868826b780a7351990f18f5c019314ae3 SHA-256: 6887dbecb38a50d2d02bb4ed817bd7d62ec22a5f5fef53cba786bd6308376555
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a payment redirection lure and brand-impersonation credential phishing. It contains numerous links to compromised WordPress upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated, but the heuristics indicate a lure related to payment or bank details, potentially impersonating LinkedIn.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=information+systems+auditor+jobs+in+canada.
  • 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.
  • 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 http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608df05699ab8---86211975332.pdf In PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16099f90f3bb21---sorofodudisarezusilolir.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cdadc88b777---xekazurasojukolegep.pdfIn PDF document text
    • http://firegallery.ru/img/upload/70020273795.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7092210be---61624632317.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/fabekitupemagelu.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/piand3rgqlilu9cjmgibq7t313/xebalezokalaru.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/nodofo.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/revasuvow.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/zemozevewuxikifaxebiveru.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/nezanixuduxozem.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16079f1608c108---rodixomevogenirorota.pdfIn PDF document text
    • http://beateromer.com/bilder/file/60160699479.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/39416350977.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160930c2766bb0---65288057480.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/90056868557.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/a27mn0si03m9ih3dh4e13t67k7/ximakubi.pdfIn PDF document text
    • https://superpart.com/files/lebisuwedudap.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/kodaranonisuroverupe.pdfIn PDF document text
    • https://energooptima.hu/upload/File/76477677233.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/pupibajusekamifapariseret.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c0e779c32---keriji.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/kkjvp2eqcer8748kddig4mql4u/vigujifusajusedi.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/7e4df5309c37a6b5a6ad4a3d2b8192a3/46673289223.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1781499f1---suwazesopedafav.pdfIn PDF document text
    • https://mabuksusu.com/contents//files/bavimexulekexuzabubiwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=information+systems+auditor+jobs+in+canadaPDF link annotation
    • 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_off000177f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00019009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19009 17624 bytes
SHA-256: 530603272f522b51e4bd5092d094fa65da9171bed4666507005193f195e88738
font_02_sfnt_off0001be21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE21 11024 bytes
SHA-256: c776dce8765c16794650fa75dc0f8f2bf14b8208de94524a12917bef4282414a

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