Malicious PDF — malware analysis report

Static analysis result for SHA-256 c79a202394e662cb…

MALICIOUS

PDF

73.5 KB Created: 2021-04-28 13:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 065413016f488915aac5060c05d4d1a7 SHA-1: d7afe71aeacea61d0fcc20b49227cd680ddf2f56 SHA-256: c79a202394e662cbf790e3f684df493474eb8276f61fdd84cd77000f1eace5dd
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate an attempt to manipulate search engine results or distribute phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8906

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://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079340706df1---90493504969.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/b11e0f95a0c80aac22779d59816dfe41/36487739903.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4f7dd0414---mujamuxesav.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/b52a650a70001449c0b343c5e81067dc/27233263773.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e88ccd790---zejasagek.pdf
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/8d41d18c51c74a2c427209384b77f5ba/fekinimulegonenalelabixit.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/c0ac067d96b1d0c7bb2c32fe7edf0873/towexofeniwepiruduren.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771be5bc489---92793284668.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607947176670c---pesibaletixurap.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb6316f9e9---36984367972.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/6j3vp957dd2ujf4i3ds7rt2t82/59888953919.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608633f0e8665---43276975429.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba6e479908---65891866725.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/pk08jp6am5eeca29lpdu71pva2/dimelexojufaj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=gre+calculator++mac
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0b8.bin
0d0c56e9aec044bf0f0073784cb0e8b2c304dcff408a96368c817af422d06f80		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B8 4796 bytes
font_01_sfnt_off0000f0ec.bin
adaf76a7406d9b7bc9574ab7a5849e3b0d1f1964fafb19115772c5dc6792b2a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EC 2552 bytes
font_02_sfnt_off0000fc36.bin
df56c672467f3434f994f80c21835f1a5dc795cc2db1c63654ad251e70d0aee6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC36 10248 bytes

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