Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7d61c230bc53489…

MALICIOUS

PDF

73.8 KB Created: 2021-06-25 07:21:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ebd7817a4fd0429ef76b21232d17175a SHA-1: 28870a4ccc16985839d53a0330f3bcdbeaccea66 SHA-256: d7d61c230bc5348980b31ce60a2c522651272452c9f4bbc07c47169a39555956
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised WordPress sites, suggesting it is part of a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains text related to a 'missing dollar riddle solved', likely a lure to entice users to click the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://pistant.ru/uplcv?utm_term=missing+dollar+riddle+solved PDF link annotation
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609086fbb4571---xurazevekamovo.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5d37c79d3---55392547450.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4d323dffc---lijolezexokilepi.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/1526f451693219c3470a8d5cd3a4c5cf/74146892493.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/gavomukifirowob.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/h35j2pv3n3djbrra7ucv74ce5q/94945458297.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b64ffc0a9df---maramefapogodazunozawumi.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a986bc25e7a---pobatogujex.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a324618f684---kemis.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/wimuxajekewojivakokatob.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/hr2o4b5gpi98fjanjab7i6sg87/gepikopaninubopirod.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/2tmuf3qvnp331g6hvit1fes9ob/93913587115.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160876b2c920ef---vipiniduwogenusi.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/zujupituwazakizotepu.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/f9d94693fe6ef2a067202f27bfd8a6be/fuxekadozepajatajega.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19F 5056 bytes
SHA-256: f33d3cd150de32774bbfaf612f0430ae02d51abda5c3a5616aec2231a295af6c
font_01_sfnt_off0000f2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F0 11020 bytes
SHA-256: c8fd6169c64499d535de136513e40c1d2cf5dd95b51a8decd0a8cbd7e86a41c2