Malicious PDF — malware analysis report

Static analysis result for SHA-256 f51537750be6753c…

MALICIOUS

PDF

105.3 KB Created: 2021-07-02 19:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2c4008fb378c0bee1a9a1fd414dd62ed SHA-1: 8dbdb368694e3f953a8a97d7e2592abd17013e93 SHA-256: f51537750be6753ca00bb76842088c170fec5c322eab44e4a463a61316511ca8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF document contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to obscure the ultimate destination. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick the user into calling a phone number, a common tactic in tech-support scams and callback phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://akinmedical.com/uploads/file/kubolaxajadonigefitovi.pdf In PDF document text
    • http://ronaldtan.nl/images/photo/95176386212.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/kjamve6cn4j7fsdcq6p5tlnq4k/68417565144.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/mulubowevopofer.pdfIn PDF document text
    • http://dalaichau.com/files/45383271789.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/38365938390.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b34d1589a---kerudejulovuluferoxixu.pdfIn PDF document text
    • http://aa-nusd.jp/suzenexizurixekukemarexap.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/8607cdd243a06ec8210143ae3b20f9f7/bapovitonekepavamuku.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bca815ce05a---dewinilunil.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/n8h6p8ut42f6qvptm05pa9ar6r/denikavugufeginar.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/8c30f0d2c8b38433dc33c66a8fa1f0f9/nonixapejebotagawagitazut.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/30393723028.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/7fee69156daabb0022a88096e4e3e1fb/taramofijurijukepifovi.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f11bd2487---59106085097.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/9860ef2387407938b737fe94b5d579d8/67684914584.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/litexugivudegebunipojib.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/35284006801.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086ff74ca353---16942129464.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5f27c3343---76085580425.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608e16779835a---neguratasisikanovose.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/80fque28gu3a2o22jdfbq9q306/xupeferibelejeketunew.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfee1ddafc---wigimokotibal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=woolies+westgate+mallPDF 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_off00013c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001544e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1544E 16940 bytes
SHA-256: 964889279a7fd1981bef38e4ed529235a3cf3b1a0459d9cf2d8bb07d942bf132
font_02_sfnt_off000180c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180C4 10324 bytes
SHA-256: 8f87b25b5b5875add986187e84a1d72d6fdcd5d9c0dfd07bcaff2e0450e1277f

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