Malicious PDF — malware analysis report

Static analysis result for SHA-256 75737aac15d39941…

MALICIOUS

PDF

89.1 KB Created: 2021-09-19 02:35:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 65f8734c8fcb535de5e69a5c88fa4b20 SHA-1: 366619324f6e6ea3f1f8662d7fd613e7fbe0c23c SHA-256: 75737aac15d399412dc0bd6948a02a11152cf8834d8620271921a2f4353a2ebd
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm, suggesting an attempt to direct users to malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick users into calling a phone number, a common tactic in phishing and tech-support scams. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/518ff55479024178121eec310e58de19/26825696667.pdf In PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/38401045372.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/64375015546.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f529d8c440---zareta.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c96956ec0---kolajimomelugisenimojusa.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/97320131127.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/94987031937.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/62525935048.pdfIn PDF document text
    • http://magiepourenfants.com/images/mediamanager/file/23079214898.pdfIn PDF document text
    • http://espwireless.net/uploads/file/fukuxazilenigig.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/54691470250.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ededbc43f3---47436463786.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/ginideserebebinemidi.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/87134478558.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/94114563673.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/27557833465.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/27079261881.pdfIn PDF document text
    • http://imbirimbir.ru/files/sexadibodoviduliruxez.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/gowuwuweketinugu.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/68881836597.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/61323461793.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/91231366193.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/muvaxip.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/xifamaleniso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=watch+after+we+collided+2020+full+movie+onlinePDF 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_off0000f568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF568 18160 bytes
SHA-256: 4c75b825c17b13a4403d1897df689219db9c8ca5934da2fdd28037d686ba88cf
font_01_sfnt_off000124a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013cb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB9 11060 bytes
SHA-256: b43019b56671522dfdabf879aad4816ff33483504d30dd3155ba012edbec6610

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