Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea988b4c5bea87db…

MALICIOUS

PDF

89.5 KB Created: 2021-07-03 06:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a4e1291453f79e376e2465bee5cdf16a SHA-1: 677a9dc15c62a0e2fbf2e8162825488926f4c936 SHA-256: ea988b4c5bea87db4282d554fef2006706b7fa84b33021c0705264b8d144d970
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites. The primary purpose appears to be distributing further malicious PDFs, likely for phishing or to download additional malware.

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 http://billsky.ee/files/file/vovusewofaxosalonutosozi.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/94788b1ce15b0c8199a171681b11916e/57504007639.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/qt8jq915m6jo5si5eogl164d55/jokedivupusaladimused.pdf
    • https://soechi.id/userfiles/file/wofidedugapeg.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/37cb63c8d28b6fedf7ec69aa7e9966a5/bikatijezamu.pdf
    • http://hoangduy.vn/vn/files/55608899985.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16097f0970de04---61531460066.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609aba7c0110c---taretufukave.pdf
    • https://arvikabc.com/images/uploadedimages/file/30629611238.pdf
    • https://rybczewice.pl/userfiles/file/datelulirej.pdf
    • http://noithattamphuong.com/upload/files/pipuwunolefozem.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8fd72bb58---dulozulilamedilave.pdf
    • https://assignmentmart.com/ckfinder/userfiles/files/45361362605.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/1002c87071075ccc38dc009261fe60eb/50113364326.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/ude22ccr4psgh1v26jq36hrtjf/refajovejupijenil.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16080f1c52293a---nilazul.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da67c02d7f---61272925947.pdf
    • http://alacarte-design.de/userfiles/file/gomojuzavademibo.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d09776cf7---94361749700.pdf
    • http://deborahbrown.us/clients/860103/File/pajamomu.pdf
    • https://sharadsangam.org/UserFilesTwo/file/rugapijokalutenusexezi.pdf
    • http://banhangcongnghe.com/upload/FCK/file/regipopidejagemuxofalakal.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/o1msktvbjc63bi099ho1bh0i4o/13901855860.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096dc81edecd---94958241599.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=classic+sex+comedy+movies
    • 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_off0000fa2d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2D 16792 bytes
font_01_sfnt_off00011244.bin
8ed567fff367dda1f3d8c1c091e507f24da4ac6d72b4643ce315aad2cfe32080
pdf-font-stream PDF embedded font (sfnt) at offset 0x11244 10540 bytes
font_02_sfnt_off00012a54.bin
97c2bc1b4c17649120d75e7b400f3700ca7bfdc57b67abfdcf8d974488143edf
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A54 17612 bytes