Malicious PDF — malware analysis report

Static analysis result for SHA-256 644499d70371db09…

MALICIOUS

PDF

118.3 KB Created: 2021-09-06 16:22:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f1cd1c64975e7761b945dd5f3028960c SHA-1: f7121864b4066e37adcb61da9125a723f0f6063f SHA-256: 644499d70371db09fbe1261750226c7167d5869cca41827931e0161855b53285
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms, many hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious lure, likely intended to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://medvor.ru/uplcv?utm_term=staffing+company+profile+pdf PDF link annotation
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/qi909lmi5r8r6hd83lp4llqa85/88199697238.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/72622429767.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/67690308829.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160788e56a9fb9---nakarenem.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/zerijanowojitaj.pdfIn PDF document text
    • http://randalljroutson.com/clients/44711/File/33591223213.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/43299954809.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/84395fbd5aa0eeef8a2bbf3530c2f188/95598247211.pdfIn PDF document text
    • http://bakoca.hu/files/file/50339150498.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/18475996498.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/zibolapisibelezijufije.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab0e4f0c92---95658448378.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611622ce17d15---peradetunaxix.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/1110e0e32e655714c0167dd0a3af7026/gixosejupeburafonuj.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/newowijim.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/31720606121.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/72001074209.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/sapaguvi.pdfIn PDF document text
    • http://banquat.com/userfiles/files/lesorazivomofimek.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/68168173683.pdfIn PDF document text
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/49059900562.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/eebdbb5e3416c49960eee0401b9b51ac/35911755622.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/xumezeluvax.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/84191651770.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_off0001688c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1688C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001809e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1809E 19260 bytes
SHA-256: c802d8b6e7273025c9e3b551bf4e04a840d7dd0f8137206b021587623a56b3b6
font_02_sfnt_off0001b249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B249 10984 bytes
SHA-256: f50022cd5a06bfabd42ecd295e705c5ad09d9ac8670d93aea541384b784f8c9b

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