Malicious PDF — malware analysis report

Static analysis result for SHA-256 86bc56e181eee578…

MALICIOUS

PDF

105.6 KB Created: 2021-07-03 07:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 71c7ec46673d0c69f840687024f19466 SHA-1: c8599aec42e8741bd9774c5357dfa2d08a36d82b SHA-256: 86bc56e181eee57867a359174bee2e384b0f5a735a3c562baa8cb02948274b91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are identified as disposable hosting or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the structure suggests a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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://nomylo.ru/uplcv?utm_term=heuristic+approach+definition PDF link annotation
    • http://candientuvibra.com/images/file/xivorojuj.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/noroderenuxedet.pdfIn PDF document text
    • http://fuga-hotel.com/CKEdit/upload/files/muwijovepag.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160828daf2cdeb---kibovuba.pdfIn PDF document text
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/ko35iefpapgvqugr18b3m9fv67/vafer.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/45536793074.pdfIn PDF document text
    • http://ezibra.pl/upload//file/keseduso.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/xagovowuz.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/on9m39rk5es1a2m4ms275tb712/32746250504.pdfIn PDF document text
    • https://attack.lt/images/files/87648412032.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/19088132812.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc111def18---68016543137.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e84dca43f---zatometizona.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1606f689b2e4ba---87025123287.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/vquk0nah1ri63ditq6jlgeag34/fenukujowofudiduwedopu.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/muund189tketjp3of4u87t6k5i/mamebego.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160789d1f69474---fowogegosorisaxaxaloful.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/rglm7moblu6faitnri04php5p4/24803245287.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/82256107892.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/4591692818.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/vevubajokejorozi.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/4t7o3n8jiurdjdtfdn23nks96s/dasal.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/5efeb0a32d9b41b9350b179ccbeccf0c/lurisimagemolenezif.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/3712aff889f583f057a70bb108d3bd11/wufipivexufureroribibaguk.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b5fcf155ba7---11030574710.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/9747e0b0502cbbf630fd6868ff56f962/67952050443.pdfIn 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://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_off00013409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13409 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014c1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C1B 20148 bytes
SHA-256: a5f3202e21db089cea1f767eaa71dda181d07bf541611992050c42d96b05a53a
font_02_sfnt_off00018084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18084 10760 bytes
SHA-256: d4a5907a5c51778a66f67da81d088812d231c0a8bdb38a7fb5a650184174825b

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