Malicious PDF — malware analysis report

Static analysis result for SHA-256 6043787797883a52…

MALICIOUS

PDF

81.8 KB Created: 2021-09-03 18:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b9222c82d5ba80d72a0d04f2cfbd4d81 SHA-1: 9af09f0e23d62cda0a3ce46a4c1d076e1538b17f SHA-256: 6043787797883a521a6d38a9b3dbcb61e11b530fd29c4f5864965fc24d76d886
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous external URIs and link farms pointing to compromised WordPress sites, suggesting it's designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a tactic to leverage compromised infrastructure for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://crysiq.ru/uplcv?utm_term=honeywell+water+heater+manual PDF link annotation
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16070cbc8b9ed8---39558138372.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2bbdbb1280---binuzebajifunurudasujoxav.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c1e7266668---14836570723.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a895c0704---62852738478.pdfIn PDF document text
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/56675687129.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/421mgkkpu42esr2iaf0q11o4s3/24333335258.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/34f086ad5ao07mnlvl82cr9247/keduzadetiwewim.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/1533490409.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/83063926657.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094440412923---kobigotetutogimedawuka.pdfIn PDF document text
    • https://advik.net/userfiles/file/81741226302.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608824ea693c0---basegexugoxuvenipulud.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/jesedokulerimavipikexuri.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/b9519763cd71a4fb78f46086af4556c9/75554057263.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/43762620236.pdfIn PDF document text
    • http://www.pvvc.cz/files/13322915265.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/53526602443.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/9lc3kkkg56oh5ubq70hkfg872v/84860627645.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d19d5d0cf22---ginasewuboxikukewovosij.pdfIn PDF document text
    • https://senhewood.com/d/files/bopobulaviki.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160940a1f14063---44625001882.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/33242616243.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/41472277749.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE76 10404 bytes
SHA-256: ee49fadf5c218b5737e77968e37c8f48dd4c9035ea349ca9ce6fed86289af08d
font_01_sfnt_off0000f5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D8 17696 bytes
SHA-256: 3c74daa5321a18a9ba642400adc2f5c89873c45d0b50ac7b73046fe357dc8d56
font_02_sfnt_off000123af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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