Malicious PDF — malware analysis report

Static analysis result for SHA-256 dce6546f8561c927…

MALICIOUS

PDF

68.4 KB Created: 2021-09-25 08:15:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: da468d3dacae79cc8de50bb2e8145921 SHA-1: a8defe1dcb8ebb077901d91e5df2c7811a173b95 SHA-256: dce6546f8561c92748c513ef5ffb2b4a28e1c12505fe40afe4ad248dc5529229
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://elminhaj.org/userfiles/file/2737982002.pdf
    • http://lexprikson.com/admin/style/images/userfiles/file/lufifozofekuxo.pdf
    • http://www.corazondelsol.es/ckfinder/userfiles/files/34752192747.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/2ad0fccb30093121b631ea6a2537c933/95249549946.pdf
    • http://viorina-deko.com/images/file/lifezepisi.pdf
    • http://sabaispa.net/userfiles/file/memedipukiwegijulewupap.pdf
    • http://sun-green.be/ckfinder/userfiles/files/74699256885.pdf
    • http://fruhmann-elektrotechnik.at/99693987138.pdf
    • https://impactmediaresources.com/userfiles/file/3682107526.pdf
    • https://comptables-publics.fr/userfiles/file/99400726504.pdf
    • https://spcinternational.in/ckfinder/userfiles/files/pibobusovolatiguzokoku.pdf
    • http://abwrichmond.com/uploads/files/3860276874.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b63eb9c533---80342354014.pdf
    • http://vakaruinzinerija.lt/userfiles/file/21141325256.pdf
    • http://alhegazgroup.com/userfiles/file/zorasezizoma.pdf
    • https://goooinggroup.com/userfiles/files/20210903_050200.pdf
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/naliwugiwuwupisuz.pdf
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/betugufexixuv.pdf
    • http://hankyunget.net/userData/board/file/47178472606.pdf
    • https://drjou-vc.com/upload/files/rijiforokeseviner.pdf
    • http://deltools.com/userfiles/file/vaban.pdf
    • http://skupka54.ru/upload/m/66318124081.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/d630847251925cff1231cc023e462d47/41287572068.pdf
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/6902669264.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=io+games+on+browser
    • 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_off0000ae73.bin
0cad963ca1603908c6022da9ac695b0694295ad34d8c0d2e009bb6ff91551987
pdf-font-stream PDF embedded font (sfnt) at offset 0xAE73 10392 bytes
font_01_sfnt_off0000c606.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC606 16792 bytes
font_02_sfnt_off0000de18.bin
2e54ace64da626bfa6c37047830639083aea164f93e5cd82e48c4d13c020aebf
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE18 15176 bytes