Malicious PDF — malware analysis report

Static analysis result for SHA-256 d90ebb0e36b638f4…

MALICIOUS

PDF

84.1 KB Created: 2021-06-26 23:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2517c54b82ff2bd18b56e4021c67164c SHA-1: b056f2d6dfb62b029de09c913da5c4d38e24c57c SHA-256: d90ebb0e36b638f4552ff281bc0b225152f83b86ef2033852b98ea81bbb8a5ea
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised WordPress installations. These URLs likely serve as a link farm to redirect users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crewmak.ru/uplcv?utm_term=front+pull+ups
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ab84ae26b---74691031769.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16077c4f64a9f2---45099416709.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b172017d779---60961181499.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bca95d4d22e---12864205366.pdf
    • https://ctsgroups.asia/images/file/25748140368.pdf
    • https://ntpuvoice.com/ckfinder/userfiles/files/takojejidobed.pdf
    • http://arcomproltd.com/userfiles/file/guludoxabigew.pdf
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/9099f37989d264e13be7e26169eda8bf/zurixipule.pdf
    • https://1877painters.com/FCKeditor/file/zafiwenigituvoxokosenif.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/3bc08ac0d6328f0411da19f8324e642b/38510871929.pdf
    • https://gegeny.hu/uploads/file/bipugufuni.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160967cd3d4213---97157671246.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/7863aaabee9dfaaf5369af3bdc967d8a/xobenevix.pdf
    • http://softwarefactory.nl/images/file/zadabidame.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/52374577260b473a58e6e8.pdf
    • http://puppiesjust4u.com/clients/c/c8/c8a8d0e690f73854b1e7a5fbb9521f82/File/xukipewedufod.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8db80cc5f---liguzix.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/87dodf9du4q8552cnjid7sa016/74525502804.pdf
    • http://mail-ex.net/userfiles/file/87055073884.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a460f729f6f---59392594291.pdf
    • http://olsztyntransportmedyczny.pl/userfiles/file/pemururi.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/c58a5872d272bba1a4210c87d639a3db/biwewato.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098aa2a770f5---90037094564.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_off0000e78e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE78E 16792 bytes
font_01_sfnt_off0000ffa0.bin
f321f966cd77f24fe541aa08b8c0c7d0ffe513a4cb1621e4e81eb83738d87480
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA0 17568 bytes
font_02_sfnt_off00012c16.bin
a056ee23fcd187b1e85d1aed5e19ae788054f9fbe6a0b6d88949602481aaab9c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C16 9936 bytes