Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a16f9afca3a2dbd…

MALICIOUS

PDF

84.6 KB Created: 2021-09-07 11:28:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5d0c3705abf0fb251f479b740c724f89 SHA-1: 268d824d3d1bb15fcd1e1234c1f6bb573d81174b SHA-256: 6a16f9afca3a2dbd0813a5c1ac539ea20d57035eb62551231748a61ba80768e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, likely to lure users into clicking malicious links. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://coretry.ru/uplcv?utm_term=cogat+form+7+level+13+pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609455e874a91---talizabosit.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfded50a96f---gowowugubofefoxu.pdf
    • https://hutechsolar.com/upload/user_upload/files/54065800159.pdf
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607195387f559---xivoketuvutuletatile.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/9e43ada41d7965cd56f017792e50d326/30155915457.pdf
    • http://mrs724.ir/basefile/drtiketcom/files/51685594194.pdf
    • http://yaqeen-eg.com/userfiles/file/11732484828.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dbf4120fd9a---xadikigorusefapuzixixa.pdf
    • https://ctners.com/ckfinder/userfiles/files/27728533752.pdf
    • http://burelomdo.com/ckfinder/userfiles/files/kebivi.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/9ef0749466fbadc22770385935b8d22f/64822881269.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/2827cb922f044dca7f2f3b591f745d68/vumapaladiwonu.pdf
    • http://knoxvillecentralhs1966.com/clients/8/8c/8c0a3a1fea337096d337135aeb812fb1/File/ruvanuv.pdf
    • http://hoadondientu-ptp.vn/images/ckeditor/files/favuj.pdf
    • http://cmtdental.com/upload/ckimg/files/runibudiborosibirare.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a68c1c7182f---totevawusefumefur.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/dnibse04bf3aut763jsurgogg7/vubafuxabomewosukiguv.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/9a8a960afbba61c478146dac166e16ad/27924229116.pdf
    • http://p-jtech.com/userData/board/file/76169225197.pdf
    • http://onlineexpert.in/userfiles/file/ferakisaw.pdf
    • http://syarmarka.ru/userfiles/files/14641578823.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/e76d8f5bde08380d13888be6c71157ea/bisuvozifikopupolodenim.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0b6a05023---77576568067.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e08d.bin
54787168584723cbed48519c11fc75fea0158db8e59375c71973c0faacd299d2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE08D 19580 bytes
font_01_sfnt_off000113e7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x113E7 16792 bytes
font_02_sfnt_off00012bfe.bin
59c466281c8977ad8b5f0dfc6b4acdbfa8c2b0ffe9af2098cc54a1180d5d0e1b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BFE 10848 bytes