Malicious PDF — malware analysis report

Static analysis result for SHA-256 57d6315f74a8ae81…

MALICIOUS

PDF

88.3 KB Created: 2021-07-03 19:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 983f8dc5df848bdb36869f7ce39a996c SHA-1: 4ed33ae3116d18e8aa22a4f5775f600695b5b538 SHA-256: 57d6315f74a8ae81f151f8dc50494a0ce8728b24f6d56f7f90c112eb581c5a93
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure as a link farm, combined with the use of compromised CMS uploads, points towards an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://irlanc.ru/uplcv?utm_term=bible+verse+the+peace+of+god+that+surpasses+all+understanding PDF link annotation
    • https://bbpartner.cz/userfiles/file/powisupoxewikitobizanu.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983d1da93f7---65249653295.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/vamajor.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/19513824712.pdfIn PDF document text
    • http://vetcarefoundation.org/userfiles/file/40342682459.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b70cf5d446---zizodapaweguz.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/5866008087.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/13345196765.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/45288439388.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/kakajoza.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/abfdbd83692baf8cdad82921fdac328a/tugibuxakobazorononezege.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/gukasajotusijar.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bc3f25de0---18292771558.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/e99d1e6c899f8cca4c78fe1fb4b8218d/lotetasosen.pdfIn PDF document text
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708b2314c07---41271498618.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a8bf191b07b---34213491242.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92dea11c87---bumalewalupotu.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609298fd4e399---kalerogilatutixox.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/22812919007.pdfIn PDF document text
    • http://upbfassadenbau.com/upload/file/57089015798.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/vq1u6t1tvg7nnujuqtscsiamt5/wifaviduzotekoxuwakeruga.pdfIn PDF document text
    • http://didopack.com/files/nedubeveludapoxulonerufuj.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099b0bd367b3---tamojumisu.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b439f18965---14260846403.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb5949c5d2---17172244699.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_off0000f555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF555 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6C 11256 bytes
SHA-256: 3cfae2f126532321a7940808fc3aeec6dc01c9dbbba0801ea25beb4551731dd3
font_02_sfnt_off00012769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12769 16868 bytes
SHA-256: 0869aeecc4bb21a9e42e6019647da6121d01ed984f432c83fcec14aef53abd42

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