Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf54767e8589fe31…

MALICIOUS

PDF

78.2 KB Created: 2021-09-30 16:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1ef32f275aec365091ff92005ca8f127 SHA-1: 8b153ddb4f624e5b22776990f19906466686a12f SHA-256: cf54767e8589fe316c41a16288faf693f0d389075fba4b48dfeb18e933afde9c
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many of which point to compromised WordPress upload storage or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://preprodpcb.com/userfiles/files/fokilev.pdf
    • http://showdoimovel.com/files/files/gagonaliged.pdf
    • http://energy-labels.nl/userfiles/file/takunulanakunexi.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1614fb68fb4f9d---7425619120.pdf
    • http://homelife-superstars.com/image/files/tukaxiju.pdf
    • http://crmrealty360degree.in/userfiles/file/18299184116.pdf
    • http://nissanotogovap.vn/uploads/images/files/tapipofajopimomer.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/1db59ba125d40983f073154610403922/60525087988.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1614bb41d3c9ed---2502335319.pdf
    • http://pluimveebeurs.com/userfiles/file/kogiximosazur.pdf
    • http://kvbm.org/pds/userfiles/files/vimovijovadabise.pdf
    • http://koreadramatour.com/FileData/ckfinder/files/20210926_C0B9A2B5E5CE5644.pdf
    • https://bepcongnghiepphuchung.vn/userfiles/file/losilolipu.pdf
    • http://weiddy.com/uploads/files/202109041104251131.pdf
    • http://thebankcardservices.com/uploads/files/82554954996.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161311519de49a---loxovubajer.pdf
    • http://tjtvina.com/Upload/files/genevejimi.pdf
    • http://arabic.cz/ckfinder/userfiles/files/tebezurutotijadezaxar.pdf
    • http://ihanzao.com/userfiles/file/20210924191911_197387523.pdf
    • https://hogies.com/includes/template/uploads/file/11351812481.pdf
    • http://ez-surveying.com/htdocs/cljr/data/files/54459099319.pdf
    • http://www.pattyn360.com/upload/forum/files/wanafevotomubumatis.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=best+smartphone+apps
    • 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_off0000c37c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC37C 16792 bytes
font_01_sfnt_off0000db93.bin
9d7a532be2522ab74890198bcffdae5a85130a81c38a023006f0b67e1b0ca485
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB93 10432 bytes
font_02_sfnt_off0000f30c.bin
774345b100dcb880d7402d3e233be2b1dc877911c72501cc83d62c22800b6974
pdf-font-stream PDF embedded font (sfnt) at offset 0xF30C 22044 bytes