Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd6c4a6c55620188…

MALICIOUS

PDF

78.1 KB Created: 2021-09-05 22:14:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 672cd9c2a7ef2c9b9b71d61e73e68fda SHA-1: 7dd4ec67b8688be17a09e9b749818c3c8b1cac52 SHA-256: fd6c4a6c556201882709665e3788b92792f844bca0acd776018f82528fbaa6fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking clear user-facing content but containing embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf53b8493f---13833333245.pdf In PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/52aef9f84ac1bb5f74fd784e52b70019/48363825051.pdfIn PDF document text
    • http://dgjst.com/upfile/file/96425981984.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/a2dcd5e5c96bc0bcf84b727096ae72f2/rixafoderesowov.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c77fc851df4---viwenewunazo.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cb40f145c---difepiwu.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac920e8750---xitagamuronupuresa.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b519870a43---jinokidogemuxejejo.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/61613917743.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/musijexu.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/b62580a9a6838148c5cf973a2e17f73e/70270651835.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/13729879672.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/85907065461.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/25134648781.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/vulomobuzemapowize.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/3dafe53fa2693151f3d43ea447b465a8/81880812154.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/79545225241.pdfIn PDF document text
    • https://baongochoa.com/upload/file/81213747478.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/lagokawugiromabufenudow.pdfIn PDF document text
    • http://eko-uklid.com/files/file/dogakenatenanizuf.pdfIn PDF document text
    • https://unosms.us/userfiles/file/15088171670.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/26879625960.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/37884285713.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161161a5d31136---kowogimekuzanajolaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=convertidor+de+pdf+a+word+nitro+en+lineaPDF link annotation
    • 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

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_off0000ce6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6D 17108 bytes
SHA-256: 59a651ab46e9477232214a91346da704879e537fb439f2dcffba94a3133f886b
font_01_sfnt_off0000fa0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0B 10508 bytes
SHA-256: 2e508833c0171e5d48e52bf4c54258d9ad4143f9aa3ec66994840f2c7c8ab430
font_02_sfnt_off0001122a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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