Malicious PDF — malware analysis report

Static analysis result for SHA-256 86cfe8c16c6daf7a…

MALICIOUS

PDF

101.6 KB Created: 2021-05-27 16:41:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c4ae35d0840f8975e6b7e4a69fb9682 SHA-1: 9f61f9b828a94e6880f586b161da313929f98961 SHA-256: 86cfe8c16c6daf7ab4346f4475565a51d9f7ee2101d42a112174dba5542c2c2e
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs suggest an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9101

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://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea1110b798---63890409490.pdf
    • http://www.jobsincrete.gr/images/_user_na/file/33914007503.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8b0033440---gojuzirivo.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7348e9f08---79413525034.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/i5718g88llh7lj6c7egqq3ke71/xutameba.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/c1cbb50c21aeec1c45f5e00652613472/64760141671.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac10ebada26---pulalaguduwekad.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c9529185f---64914209195.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160850c47c68a9---suzorotokibaniripez.pdf
    • https://acryl-bg.com/userfiles/file/befil.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/ania6jui8i76jud7cgv2vf7lr7/865555108.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//dolomajuwirixe.pdf
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/f7133100e187b255bfc5fbf19cdb79ab/87330642952.pdf
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/97720ed967f49289f64ab8f995fcf290/wekizapoberogemipovesejo.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/o49i2al2mevqau7moga6tk9h2e/jasemomajifevirej.pdf
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/mizutaragijo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=harry+potter+and+the+goblet+of+fire+trailer+hd
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001515c.bin
1d172fe479d73dff4f51eff4279710b1c489ee13db821940499bea754e9b46d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1515C 5328 bytes
font_01_sfnt_off0001637b.bin
515adc51628c165fe6030014e44913e7633891864e3079582d8bdfd64e138ecb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1637B 11824 bytes

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