Malicious PDF — malware analysis report

Static analysis result for SHA-256 5acc26e64d7c8dc4…

MALICIOUS

PDF

54.7 KB Created: 2021-06-19 07:17:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 70360630128774a02412e9dadae3b475 SHA-1: fb257e611f2bc475eb00cc508fd480666c918b8f SHA-256: 5acc26e64d7c8dc425b1ab204d4b176bfd70e7a074d517fe7e7c372654209031
154 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The document likely functions as a lure, presenting itself as a PDF printer installer to trick users into downloading a secondary payload from one of the numerous embedded URLs. These URLs often point to compromised WordPress sites, suggesting a common distribution method for malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9152

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b390c043c3---76060015382.pdf
    • http://whuntex.ru/userfiles/file/fomezenovurinujoluwutapat.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/f8ieuchrhnk35i2qeef8m9qa9p/57795579850.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/38fa5e379952831656d682b5d49080cf/gefelaximefawip.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/fba12d20c20e36bc6b7ef98afdaeed5b/79364956095.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0ca997cb7---gefubosaxewagisazi.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a246e9d740f---widurukavumap.pdf
    • https://agentcctv.com/userfiles/file/pusolosedovosa.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/22ad14efcca25ad35fd2ed984965686c/16645636570.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/46a90ca5bf214ad031199bd6fc41f696/26125611920.pdf
    • https://invest.pl/userfiles/file/28484937504.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/42ad7e9e4f6b1d820df921690ccb8824/fexotunumudabisavu.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/c3a501817dade9198e549bbbc4a54440/gesol.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609121d5264ce---wabunuzebezapegeva.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78c793adaa---12913801315.pdf
    • http://digifast.cz/userfiles/punusavanevilibeki.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=pdf+printer+install
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c61f.bin
493bd0382d50055695607efc5905013b7b41f96d324853b40420b6cdfc21a023		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC61F 4716 bytes

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