Malicious PDF — malware analysis report

Static analysis result for SHA-256 8503da1b614e0c4f…

MALICIOUS

PDF

84.2 KB Created: 2021-06-25 21:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b6f41e8a90c291d9cd749d88c7457030 SHA-1: 82cb777f16b14e1edad71a986aef385ee0ba7106 SHA-256: 8503da1b614e0c4f1c7586ee06c14fc21e7ecfed8e968ffe04edbcf941dc1c60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It functions as a link farm, containing numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://krisoc.ru/uplcv?utm_term=local+stationery+stores
    • https://allcreaturesinc.com/files/files/42531129516.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebb89620a0---tutepese.pdf
    • http://marthomaiticherukole.com/userfiles/file/jefusipulaze.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/16bfa47fdef06a6bb1c1563690157f5f/18903958111.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/980489c9f50605172fa56027b4d2aadb/17937668168.pdf
    • https://amrapalispot.com/userfiles/file/semozafetu.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/76259700ad866b0a34f057838209de39/88372881145.pdf
    • http://akcjonariusz.com/UserFiles/file/89399772489.pdf
    • http://aliglobshop.com/userfiles/file/vaguladod.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f636d6cab---jivedewotexawarak.pdf
    • https://anthonygillant.com/userfiles/file/27523982929.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/50ad332cd94755e266b746362053f793/peverasu.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c924bb2163---rezebim.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b41fd774b---nigogileb.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160aa318597bce---41550140040.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082192762c42---xirujexuxupipipelefad.pdf
    • http://absolutelyneon.com/userfiles/file/68189813791.pdf
    • http://studioarchperissinotto.eu/userfiles/files/tuxabamawibutanofogu.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9076558a9---16724137196.pdf
    • https://ecotranslation.ca/upload/editor/file/14171598675.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c3524f3b473---11381537873.pdf
    • http://mertlakustika.cz/images/pages/file/pojazam.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607092cf30dba---14079117638.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/1ecb9cf19fbe21eaad65103320bdf132/ruwofurulujijoluv.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_off0000e989.bin
92dfcbe3607eedf077502b869d6f61def0ed1cdec0ac62b9151a4bc802f776ba
pdf-font-stream PDF embedded font (sfnt) at offset 0xE989 10296 bytes
font_01_sfnt_off000100de.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x100DE 16792 bytes
font_02_sfnt_off000118f0.bin
0ba939b378d099ac03c49893e3f1bf94e93eef057cb3e3c97c52ed519717a1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x118F0 16596 bytes