Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a8879f474e4271a…

MALICIOUS

PDF

81.3 KB Created: 2021-06-25 14:18:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f17809e23e118aa3d58aa853282c9059 SHA-1: cf8687a87a7dd34ca1b5f6ee0c6eca1832f845d1 SHA-256: 7a8879f474e4271a91637bed6b6ed71e7e8e57edc4ff8955e62f6441e898856a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. The primary purpose appears to be directing users to malicious content, likely for phishing or malware delivery, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://medvor.ru/uplcv?utm_term=3+notes+per+string+scales+pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab868aeb311---kadepunarizonovugumu.pdf
    • https://dimensioninteractive.com/WYSIWYGImage/file/puloduzagutebonufowop.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070806ab6e00---55007980589.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf35ad5eef---13821373301.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/lrstsepnggohp67f14d8rqtki9/84208636898.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090a2389e256---8937072937.pdf
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/34985352081.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b442517e32c---mejevologuxupulel.pdf
    • https://alarrabnews.com/images/content/content/file/57998559007.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a57cba92391---ribozixebibi.pdf
    • http://anhuizhkj.com/upload_fck/file/2021-4-30/20210430231416144997.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/7c531b1abbc5e67551ca0442621e9bda/87022128938.pdf
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/fegef.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/d77ef9619680acf188381de54722ee1c/sepawu.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3ets6outd7pj7c65m2j5petsq2/sezowipajutapi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db57.bin
63789c8f0a13a1807ad88cca9f52aae9e5c96bd7ab79f75ff110e1d31c73e045		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB57 17080 bytes
font_01_sfnt_off00010767.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10767 16792 bytes
font_02_sfnt_off00011f7e.bin
727c32f1d6032be8f01b34e540011219255bb6168848e1e87a0c4c2a895dd54c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7E 10868 bytes

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