Malicious PDF — malware analysis report

Static analysis result for SHA-256 878551123a52e9ee…

MALICIOUS

PDF

192.4 KB Created: 2021-06-12 07:21:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0c61f980a3e9575af9dc28c17e56c9ac SHA-1: 95aed28bd239200048fbf6d82a34a23d6497eae2 SHA-256: 878551123a52e9eecd106e90836aba564fad04e4da8d3bccd70a94ecf61cbea1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://drafthe.ru/uplcv?utm_term=miku+by+anamanaguchi PDF link annotation
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607246a4c8de6---70382255688.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/qmkg577592j7d9b79ub9nb9331/46217624051.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/lcohrd0bd8vk7b4aqj1uah10o5/gopajowinuti.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/lafiporejigu.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a318f519d7e---83997722718.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62b85e9f5e---pozaloxovadalitatexeruso.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5d34e0020---56321691321.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/sizefizubu.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0e52e6449---vefanoxogexijejiruf.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bec605829e8---dulefexalufitosemasaxozu.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/j00ca598egs5tar49ip3tlol22/tosutikawaneteresa.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081bdffc77b2---lesirimubopexibesa.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/25oejt78jgn5mfgauebcr27oak/susapomibezudatibene.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/877fe8fd76458c4fc93388155a498376/segejoxazoxa.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a5e4e6a6e---17719407394.pdfIn PDF document text
    • http://rotarylaspalmas.orgdocumentos/file/68769854259.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19714 85008 bytes
SHA-256: c8cdd4a6be7dd48204f1a5a3d2902895868517e445aeddce1d1d2a5105d7928a
font_01_sfnt_off000293ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x293EC 4792 bytes
SHA-256: c0c9edaed66664b3efbc7b232cc07fa775dd13bfad710cd3533f8af265468d63
font_02_sfnt_off0002a40e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A40E 13300 bytes
SHA-256: 740d539a301192937dfb9e44d8beff0ccddb81bbb22d2ecacbcaf78516c8d0ee
font_03_sfnt_off0002cfd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CFD1 16268 bytes
SHA-256: 9f49415ff1e84e982edbeb43a8c4ae2ecc51b531b09d6df209dc2c2d1a141382
font_04_sfnt_off0002e52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E52E 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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