Malicious PDF — malware analysis report

Static analysis result for SHA-256 088fc2ce78fbff05…

MALICIOUS

PDF

79.3 KB Created: 2021-05-27 16:36:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff613799fbb9b9b71fc30bffbf188b9a SHA-1: cddb4456f2557ff2d56d07c7f42e6e24d405608f SHA-256: 088fc2ce78fbff055fcc1d7fe6b67f2f2dd747f9ca067d2ecfcceee0b9d9ed19
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm for phishing or malware distribution. The ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or trojan delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9250

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://detectiveoffice.net/userfiles/file/disidof.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b585bc39b---76322680801.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/3df34ba4eea6f825d7c9b1b5d5c01e98/37704686636.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/84b0e84052c3bebd49e65e4c4a803d39/53190546277.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/cc1bb41d2ffb36b1763542e055d1fb28/xegowogosexodojibevefexew.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/bfe7a9e8ddf4c324ce379282ce4f0f46/duguwaxebaju.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c93df53429---42029912808.pdf
    • http://artospace.com/pics/file/1429066062.pdf
    • http://wksystems.net/HotelEstimator/userfiles/file/48047972639.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608807be8d471---23246018312.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/633bf28330f174f5ca9cb326dac0ef3f/1400676533.pdf
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/4f47963a3e4fce0bc80339ca4ac0e837/tasuwegugititewabixo.pdf
    • http://ehomeforeclosure.org/images/file/99524949636.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=hareketli+%25C5%259F%25C3%25B6mine+ate%25C5%259Fi+ekran+koruyucu+indir
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e055.bin
7cae1cddbb538e07569bd7706ad889623de88192c8934bf4f93bcfb07fb61f25		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE055 5420 bytes
font_01_sfnt_off0000f26b.bin
d62853b2163d4af138fd058c244599df405be7e92e15b114a938e199d53de330		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF26B 5248 bytes
font_02_sfnt_off000100e5.bin
28db9c227d432b60d6261fb6490858c57de6bd07c2761d46a086711fb3ed2843		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100E5 11924 bytes
font_03_sfnt_off000126d0.bin
20592f50d76d74ae95aabfd4a3a378359b324a2f9b6dd5e316592271d83ae37a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126D0 17112 bytes

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