Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d446acce5e9cfbb…

MALICIOUS

PDF

83.6 KB Created: 2021-07-31 06:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f2be3aa240443333faf29bd108c5a22e SHA-1: 3f058ba28cb93ebb48d0cbcbb2af2b79e50b5040 SHA-256: 5d446acce5e9cfbb9ce7abff59dfba715cd7506b84be5189dd894b2aa7874183
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lead users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077475ba0168---71476540396.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9e6d57d08---53398929603.pdf
    • https://raljob.com/userfiles/file/kopawatowozibovuzetumamu.pdf
    • https://cape-electronics.com/media/file/vizosizobagoro.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/95326541378.pdf
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/f66c56acc2db3b3f593517e44a7b402d/sudutetazanukidezezepurus.pdf
    • http://pressvaluation.net/userfiles/file/nuvuped.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/fe2823e726af9f929011dca2722d8ebc/jinogetekujujiranafupo.pdf
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/20122815043.pdf
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/orkp14u5kk8vp5obifb54ueude/93912149334.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe4020b2f1---989675985.pdf
    • https://legyenegyjonapod.hu/userfiles/files/14568825482.pdf
    • http://vladjurnalist.ru/archive/file/35454998991.pdf
    • http://www.ecvbrass.ch/user/web/file/bavupipopejimedepobiliw.pdf
    • http://buckleyfamilyofdarling.net/clients/0/01/017bf228c8331327bdfb67b1798bff80/File/39983230590.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5aca19a6b1---vidodajiwejatolatamiwunad.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16073e036f1b1b---77913676649.pdf
    • http://alemotta.com/resources/original/file/vulepejomapunatoxisab.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081146ee61f0---zufovibopug.pdf
    • https://blindnow.com/userfiles/file/fojav.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/59b92df481f74b8c98d6f6d53ad7122c/favesuwobefuluwiwan.pdf
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/jisofim.pdf
    • http://askort.pl/Upload/file/kazetusufetogubus.pdf
    • http://bukharageorgia.com/sites/default/files/file/1078289485.pdf
    • http://chothuexeninhbinh.net/data/dulieu/files/34370130875.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=pelicula+completa+en+espa%C3%B1ol+barbie+una+aventura+de+sirenas+1
    • 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_off0000dd88.bin
be7438bcccffc733f5cbde70d26be70098c0e29f6f90982e5469cfc7a24725ac
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD88 11240 bytes
font_01_sfnt_off0000f772.bin
b2bd820a95bf1836e9213d4fc404d5c58671523d0818c3618c03a79882705a20
pdf-font-stream PDF embedded font (sfnt) at offset 0xF772 18176 bytes
font_02_sfnt_off0001254b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1254B 16792 bytes