Malicious PDF — malware analysis report

Static analysis result for SHA-256 976fe0ec9d86a0b0…

MALICIOUS

PDF

67.5 KB Created: 2021-09-07 23:26:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: eb35c7d2b076ba309a6ef0fd6a142ac4 SHA-1: 1b808cf2a49b22944d561eb30e3e1ad918f1c272 SHA-256: 976fe0ec9d86a0b0eeff65af56921f6d615ae942186dd88271ce5151b7449a29
176 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. Heuristics indicate it's an image-only document with clickable links pointing to compromised WordPress upload directories and disposable hosting. These links likely serve as a link farm to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • 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://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/0019057aee9bb02da8111d7a7708f668/busuk.pdf In PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/17c050a0f465b4f757ee34e4314fb459/jutukewuveziporowuz.pdfIn PDF document text
    • https://netlandschool.cl/files/buwalavotuborabipevaso.pdfIn PDF document text
    • http://mrbossamktown.com/uploads/files/21954254079.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b43844f4182---bimizurekafiwa.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160738011be2f7---wikitugop.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab0c84f7e6---19993269383.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/famosidoludobunomepaje.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfa64843992---pamedigavizisewi.pdfIn PDF document text
    • http://nanopena.cz/upload/file/jilugozavofazojitef.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/9046101968.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/9da3g11qd36j6o0d6k8b98p484/33805537244.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/84843372861.pdfIn PDF document text
    • http://dgone.kr/userfiles/file/20210822071154.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/982645124.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7ab51dfa05---wulewukaku.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085573b9c008---18284703646.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/tesoratelikupuku.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/fezutivasitelajapaxanegi.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/lamowi.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4bfe8bf6e---logebovolu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=the+gothic+tarot+compendium+pdfPDF 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_off0000adba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADBA 13752 bytes
SHA-256: 7d8f5ab4bd0d8d0edcaeb9718b5049702731632d9a9f9cfd728a01c08f01f95e
font_01_sfnt_off0000cfba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D1 10916 bytes
SHA-256: 247a47c9124efc914dd636fbe18455020c36c5d0391bc9311b44a03ac94c306c

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