Malicious PDF — malware analysis report

Static analysis result for SHA-256 f906b2e823cb3ae1…

MALICIOUS

PDF

75.0 KB Created: 2021-05-12 08:18:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 76846a43aa3067606968a4b23b7de5b6 SHA-1: e8389d3ddae0931b756dcc1f718357ca113e3f66 SHA-256: f906b2e823cb3ae1bab0072a77b825b70fc68ba2425e52048efc50513d7e5eba
154 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating it's designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery via these links. No scripts were extracted, but the PDF structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9774

Heuristics 5

  • 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
  • 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://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090937b42404---89299039656.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/0e3900c180e4bd1d9a04b1e4e2c65abb/wiwujaruraberevi.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825043115d5---dopakiberotakab.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/e07824dd2086b561aae2215703d02be8/kiwezi.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607944cd7fb34---96810150952.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/ketvutth5ac3gnr21ho3ki8aim/31509321251.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/rg14hovf26lo7rat8eehjnqtqp/13251238705.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/b3k3391b1kecr7g505ojbloai3/talarede.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/e5ac3ae624e35dcb796b20e6d5c9340e/18848169038.pdf
    • http://acecaalcoy.com/userfiles/file/41133375178.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/e46fbeb376435c23c26acf0f33aec0b2/9917872394.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/f7ad234ea7d214247f55769501c7f358/zomogolokejexi.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c67878d1be---sawupelefigujoweze.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/e0c42f1e5c4425959a5770df87832259/nuborojosimelonoxil.pdf
    • https://aduanaldelvalle.com/userfiles/file/47880656691.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/bb5cb73b409d9a094b583cbffebbe58e/gesapatikaf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=forbo+marmoleum+sheet+flooring
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000115b0.bin
1f0812de5e0515126d343bb4dbd27f98d0c4d92ec75dc066aeb2e8e7b29b7657		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115B0 5276 bytes

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