Malicious PDF — malware analysis report

Static analysis result for SHA-256 59fb8d71e826138f…

MALICIOUS

PDF

84.0 KB Created: 2021-09-04 03:11:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 023b9b31486cda2981eca20beca57212 SHA-1: 7d333e0d36309213baff8e133da46677e4c96fae SHA-256: 59fb8d71e826138f9d307602819bcb8b2858821f829592d067d0c5136fbed82e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://wastran.ru/uplcv?utm_term=aptitude+formulas+list+pdf
    • http://kstarsmall.net/userfiles/file///50849083216.pdf
    • https://agatanorek.com/files/file/11447102228.pdf
    • http://parkety-patemal.sk/files/file/nafobugidex.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/vpdu8mmphgupnavj50os5vmr9c/30106053757.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab39b4040a6---14015656738.pdf
    • http://kristenpell.com/userfiles/files/21239899992.pdf
    • https://coastalstudio.com/images/main/file/tukumowenobafuxixoxifobi.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c126c27759---29073364848.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16087195060c97---pefofatumijaboxi.pdf
    • http://animationcoach.com/userfiles/file/33411342973.pdf
    • https://alate.org/admin/fckeditor/editorfile/sologavujogelulolarulaza.pdf
    • http://rosabaum.de/web/editor/files/wepabafibepata.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d8426a4ac---minukakuf.pdf
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/sipixibuburefeposuwi.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdb5d7c34f---71467556550.pdf
    • https://dienlanhhonganh.com/images/pic/file/40691701548.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160becc9cce653---30898598655.pdf
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/roxevotodigenewunogef.pdf
    • http://www.rannatennis.ee/data/upfiles/files/88899388941.pdf
    • http://travelshops.pl/userfiles/file/lekipoxarakipewesodizivi.pdf
    • http://smartvoicecom.com/userfiles/dadobovozipusa.pdf
    • http://betonkeritesek.eu/Content/files/kibijoma.pdf
    • https://allegypttours.net/userfiles/files/13889976431.pdf
    • https://robert-zauer.cz/userfiles/file/zomonitudaw.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/fb38fa8b6tv4t2f7n60oe4cac7/32470109303.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_off0000dca3.bin
8d797090c69befddb87e36d01f6e1016379b3306b94bd691199ab332398d60ed
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA3 20296 bytes
font_01_sfnt_off00011204.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11204 16792 bytes
font_02_sfnt_off00012a1b.bin
c70209061cbc3ed6433ffda8189a4cc4720e732858378ba85c3a016d1fbc7642
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1B 10636 bytes