Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd62ad7b731d2c2d…

MALICIOUS

PDF

74.0 KB Created: 2021-09-05 07:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e234f7eaec14427040ac2eaa31b1ffff SHA-1: 92b9c9cd9b2a3b71d3df3690def90d84666fb263 SHA-256: bd62ad7b731d2c2d3f867775bc5cc546aec130377152e2556d7a5bd60d199887
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to assess the attack pattern.

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://drafthe.ru/uplcv?utm_term=put+multiple+pdfs+in+one+file PDF link annotation
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae84219ab9---38168822981.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/dm4fb6ule1ofjij81t3tvkk3at/3403915540.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/59877559862.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/3fe674ac3e464c486097b17640e12d1d/58366926881.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/xovudezimefanulume.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161042665a2337---6768012166.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/l3pu1m4qofkm1kjfgtp9jlmvv2/25627889307.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/vinowena.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aeabdd7c96---23007545705.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/sosunutufimiwowewav.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/66868530871.pdfIn PDF document text
    • http://ailizia.com/userfiles/gikabonajomujefeselaj.pdfIn PDF document text
    • http://douzonebnf.com/upload/file///52833463981.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/3987741818.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/koviwabituxugifikujarul.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/tikabusezo.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/govolopibepo.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/96372870754.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/gds1mduukod5h6r4lva0ivhdv1/jopufumepimibevozexe.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/93126702626.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/29707909901.pdfIn PDF document text
    • http://wwstationery.com/files/file/bixuvodufikudis.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/99949d6f052c47bbfcf2b85aebde2b5b/61237197041.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/46752057018.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_off0000c003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC003 16708 bytes
SHA-256: c65dfbcedae9c0ca7a4b56ea05afa14f3f2c08ae59de5b024a475f195c81f702
font_01_sfnt_off0000eaec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10303 10496 bytes
SHA-256: 431351aa9f0741e675684c16966a0c195a364907e1c2f57388d2d133664eb6d0