Malicious PDF — malware analysis report

Static analysis result for SHA-256 8259feac37abc8ae…

MALICIOUS

PDF

85.6 KB Created: 2021-06-29 19:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c07966214ea330b6890c6e0a48717488 SHA-1: cef740eae8bc19bba06a10115961962b54424bc9 SHA-256: 8259feac37abc8ae89ec35ca2345192869c10db40e48f9db2150cd73826fbbbc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://rubenferro.com/userfiles/file/30732702485.pdf In PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/ca87ae149bc1388491761be5c47144d4/buzadolinedagi.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/d5c751bcec6735bb8d38290acc562720/bopobunegopeva.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c2cb3ce4202---69891281266.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/167ecad11e81dd026b440b624b0cc9b0/bufuvonewuxixexepuj.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c780d5312b---52215388459.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/livoziga.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/12692727921.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160986ae4796b2---gamebuziveveb.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/6768354231.pdfIn PDF document text
    • http://ashioke.com/images/library/File/87259418745.pdfIn PDF document text
    • https://svrcontractors.com/wp-content/plugins/super-forms/uploads/php/files/5c6e285a2744600d232998c7acca9b33/68936809141.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/vt271jouq4fdvqh6bgcj4t4nlt/xipowibiluzifonaxev.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/33029813374.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210521195440.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078fade536b5---74593799347.pdfIn PDF document text
    • http://aps-mes.com/files/file/29358997212.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2e3ee7751---vasevovivoxa.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/95585000605.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/79461e2f5914b6fa5a54d61daf063f27/12060736750.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/16101798193.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/kibusoke.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/sifubakosuwenarodizumutut.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5af19d2ae---69518992431.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=waiting+for+tonight+mp3+song+downloadPDF 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_off0000eb68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001037f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037F 11064 bytes
SHA-256: d24e548971408f6e409f3266d974cbbd74cecd10293f7baf9532990736689402
font_02_sfnt_off00011ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE7 16936 bytes
SHA-256: 5340d3837e34dbddef8fc7125205f5ed53034df11f28e33725d34c50103be389

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