Malicious PDF — malware analysis report

Static analysis result for SHA-256 4177c9762e0294b8…

MALICIOUS

PDF

69.4 KB Created: 2021-05-02 09:11:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 64dc49295ac84dad9e5cce25feda938b SHA-1: 8d4bafc16e6601b6ef7ca862b074f6dea30856c3 SHA-256: 4177c9762e0294b8caa2959d3d7c751c841b63bad06b8eb7cf1a1b1d489a4e61
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress upload directories, indicating a link farm designed to host malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0e2f24f0e---topokenujunetudibib.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e08bec99f3---ponotigarajopapisal.pdf
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa826a56a7---jaribobovutowexojibewen.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081ce44001c4---96661536986.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/r0a5iq5ei3kmoi9u27uj8bfbj1/tulun.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608937a1a7b72---62907371205.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160892873ba1da---46210024494.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5a33d6653---gebifomol.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d52eb1e13---89430243951.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/abdbbed6dma3jd7oj6t21iktkv/71897736197.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/d4830da0262a2ae53a0c5fd1f5a2cd02/pobemewivixudu.pdf
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/88248fcb7ec8431e1acd674d541f1a01/zutilurog.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/mtvqq8rpbsnjmiisecvgukc3d6/dipetom.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160843e8ea5584---laletenetonuxowikupiwugub.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/a06d1461adc38963896b8b6f5c4d063d/50148051350.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/3b4870aa203c4d083c614dde698daa61/27000741412.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160796f7338d7c---zenomajizipizelovejuj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=ib+language+ab+initio+guide+2020
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d72f.bin
f464556428691fd738cc43e557f9f7d06d55199be45c499d89767961680f2456
pdf-font-stream PDF embedded font (sfnt) at offset 0xD72F 5068 bytes
font_01_sfnt_off0000e87e.bin
8f7193481de584b2aa3f6b228bc56d81262ced71e010cfc644aff5f9b8fa8faa
pdf-font-stream PDF embedded font (sfnt) at offset 0xE87E 9880 bytes