Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d983bac9cd17db9…

MALICIOUS

PDF

57.0 KB Created: 2021-07-27 11:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6e1878a5643fd5ca0b59d1c764f101ae SHA-1: 629b5ff18b96ec78aed30c3c8fdeefbcd97b1324 SHA-256: 2d983bac9cd17db9f1018b15db9a5dfa0bea9b482ac7596d084467dea9c022bf
154 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to numerous compromised WordPress sites hosting further PDF files. These links are likely intended to lure users into downloading and executing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7791

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082df5979050---renovu.pdf In PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808b353127f---wijurujesesijelalogofujex.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/ec669340311bfe160bd12d20dd1f3440/kijapajapiwur.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/46705547546.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/568b7c01be8c06947e00436ff743dc9a/22190478752.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/b435df54bed7e16e57805d911b71db12/67066563107.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/6276112778.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/13040443458.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d30430b533c---kodajagorum.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/e16af179831c6a7066d42cc95d9d183d/vuluk.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/565aa787bcba32f999a311688f6bc342/toxuvono.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/fk2ku4di4o8prvembk3dnebar4/39803418189.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/cd11f23a931a4e58a9fcaafc5e7a0b51/roropibagokemibajupumo.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c6f5a0a2a---17294760844.pdfIn PDF document text
    • http://ciskmv.com/css/file/51591269937.pdfIn PDF document text
    • http://zimmerei-possert.at/lowezob.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/ee6f9f794a847a0cfb8ec7be2b725c5f/65830015269.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0e3eba3e9---mavolejusikurete.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/86395763069.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/kgc9vulapu8gdk97p3m9q6l981/70187326265.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/17394662094.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/nozufodew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=bengali+tv+serial+auditionPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC603 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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