Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dfd9c250deae4c3…

MALICIOUS

PDF

79.5 KB Created: 2021-09-21 04:16:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a70775b7c15f4641d6b792384b21e0f5 SHA-1: 069b5e810287cb00d1a9c4accc55b862a27b0cb3 SHA-256: 4dfd9c250deae4c393954bb6ef08d4ed2bd09907c3f6253605cf2e1bfd590828
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URLs point to a common tactic of using compromised sites to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://kiddeefire.com/media/userfiles/files/wajojanur.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16140b3fdd7542---3541704990.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/qtq5kh6pqr42ukro4h6tvg0dk7/gakiririjewule.pdf
    • http://twozonechickenlasvegas.com/uploads/files/38834084792.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b33296ba2c---lusukole.pdf
    • http://www.tobywells.org/media/fckdir/file/10603723563.pdf
    • https://rm-parketi.si/uploads/54565333012.pdf
    • http://zaun-produzent.de/userfiles/file/82358975632.pdf
    • http://softtox.pl/new/userfiles/file/mijere.pdf
    • http://webinaris.net/ckfinder/userfiles/publics/files/befezufijesusebixaf.pdf
    • http://idcla.net/upload/files/12915168621.pdf
    • http://greenflameenergy.com/userfiles/file/21274994951.pdf
    • https://dildendilecevirievi.com/upload/ckfinder/files/34906959358.pdf
    • https://romalasergroup.com/userfiles/files/dojinazefaz.pdf
    • http://sarkar.ie/userfiles/file/dijilawitawotajuzevax.pdf
    • http://acpiindia.com/userfiles/file/vukikanurifixixafizepin.pdf
    • http://avanti-kuhni.ru/upload/files/gisodan.pdf
    • http://kapfenberger-schuetzenverein.at/userfiles/file/duvisinokobip.pdf
    • https://emenu.hu/editor_up/kuwotuwasejoluko.pdf
    • http://futboltotal.net/images/files/jawujonofuvim.pdf
    • http://irs-messtechnik.at/upload/81950426873.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140354958809---73611804525.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=cheat+codes+june%27s+journey
    • 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_off0000d273.bin
82947eac81d80ec48353497d038f9bd21dcc7ca40d2a6067f7f2e89a404cf10c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD273 10736 bytes
font_01_sfnt_off0000eb3a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3A 16792 bytes
font_02_sfnt_off0001034c.bin
d1324bec58059107c7c453b64e9253e1f22c50ded6f36121bf0cd3262b9b43ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x1034C 17512 bytes