Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4e34332a4897f4e…

MALICIOUS

PDF

81.3 KB Created: 2021-06-09 18:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: efdb8c749fadc9e4b8a675f31e61fe31 SHA-1: 1a5d2021db5665658d5d17f5792b2c0196ae0b5b SHA-256: d4e34332a4897f4ebe91ca41022d4b8c826e509f32d5c73d32f6fa4f8e89e5ae
176 Risk Score

Malware Insights

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

The PDF contains numerous links to potentially compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to exploit users by directing them to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://allytemp.ru/uplcv?utm_term=rotational+viscometer+pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bde7a5c2a4---wolibodosefigefanu.pdf
    • http://harasim.cz/uploaded/files/95100688183.pdf
    • http://austria-ex.com/images/blog//file/14597237471.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/302909872f766244b2df1556e78fd55e/nolakexe.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1967ec970---fijugadevajurewomo.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/d0d45108d633deb7eee4e392faec9539/bikamuririla.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7cdf158d5---343344906.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/5686b7e7756cceae76af8c4a52424480/ruloguvekupumufiwubana.pdf
    • http://ecohost.ru/pics/images/file/xogosodirunosinixixego.pdf
    • https://abeess.com/userfiles/file/8141190386.pdf
    • https://aspaeng.com/files/image/files/finalonuvenumiripu.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7333a75eb3---78770638296.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/uf459vmp0oc698m7d9jvoh190c/retozekujaji.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd11b4f2d3---4418189449.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de0a913390---40033672648.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://medlab.webd.pl/upload/file/10414647991.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eac2.bin
cb6c46d1f331950be5251f9a0b8eb8bf538944b7618dcfcb839c3d985868ca14
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC2 5156 bytes
font_01_sfnt_off0000fc34.bin
80459a23800ffba6737fc5874b05377010397d615dca7a41ef006bc30257d4ef
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC34 14516 bytes
font_02_sfnt_off00012a5a.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5A 4324 bytes