Malicious PDF — malware analysis report

Static analysis result for SHA-256 baf20820bb712dc4…

MALICIOUS

PDF

80.8 KB Created: 2021-09-13 18:12:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8f3025206a4ec2c9b8cd3526d4aa7cda SHA-1: 5d85b8504c22cd6de0c464498e937e29a32823a8 SHA-256: baf20820bb712dc491fd9fca70fed0d12dafd97969d6b8d877c28c4aa3aa2262
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a callback phishing or tech-support scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. It contains numerous URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting an attempt to host malicious content or redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • 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://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613133193f970---zozopibupovopurabot.pdf In PDF document text
    • http://4998horo.gmmwireless.com/contents/files/nidejijifekorizes.pdfIn PDF document text
    • http://kirche-treuen.de/UserFiles/File/bepofanabivuxep.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/sufivakunu.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/91816773288.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/bubiwozozepitek.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/xunamoxov.pdfIn PDF document text
    • http://101balkon.ru/upload/files/puxegasedojusuxuxos.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/4ff4cc969b5a5e50acc810491fb8ddad/47162818257.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/jelaxojibagol.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/kamobimibewenusipofusi.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/91569899064.pdfIn PDF document text
    • http://fitviewer.com/files/file/rexemewurekogemapibex.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/7010954460.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613a79bd5eaa7---nitasab.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161386b730de04---penagifor.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/movevare.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/dotabepasavos.pdfIn PDF document text
    • http://hak-al.com/resimler/files/52539385060.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161369531d142b---57432224939.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/ruzobinomogifowuw.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/370653961.pdfIn PDF document text
    • http://coachhouse.info/assets/file/82157639958.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=pc+games+in+android+apkPDF 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_off0000d6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F2 17464 bytes
SHA-256: 4b72cd3cf070e8c913969b3868a59167857cbdfa7ee8c7e347bfe3919a5c1a60
font_01_sfnt_off000103e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E7 10808 bytes
SHA-256: 00a235127186f1b7bc2d0851b221f88aee78c895690a86b921344ca1cd49d036
font_02_sfnt_off00011c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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