Malicious PDF — malware analysis report

Static analysis result for SHA-256 94bce5bfb9b53b5f…

MALICIOUS

PDF

78.2 KB Created: 2021-08-28 17:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1461352a83a99d0c7cb076e8e2898abb SHA-1: 8f64f6afe6030f6f3d2ee75ac75c1a0861d348ff SHA-256: 94bce5bfb9b53b5fefa3f9721703d4dfa91fade1d653d94c759acc0a671a80d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting. The primary purpose appears to be directing users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://roweryelectra.eu/app/webroot/uploads/file/16199096212677.pdf
    • http://studiosantese.eu/userfiles/files/4751716238.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/jj46klapjaq500cg4ugb4ljmpk/32610038901.pdf
    • http://uelzecht.lu/userfiles/files/81158552114.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/cur7t6o3tuo53m4k36lia08q78/36747669683.pdf
    • https://tdfstore.it/file/kidatesopemujederanumi.pdf
    • https://baongochoa.com/upload/file/xozizewukunivojatoxiviro.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b86cb00c533---86787379375.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9b44e2d27---gojev.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d3fd35353de---91898607898.pdf
    • http://awkontrakt.pl/ckfinder/userfiles/files/metilumesusa.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5b405abe0---rawukipuduw.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/1944ef3965b09deb679b7c8c28076fde/57418594848.pdf
    • http://gramercy-grand.ru/files/file/93202671623.pdf
    • https://voyageaventurenepal.com/upload/files/zomumutogipob.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/ab4a5bc201cbbd966853dca0b2740101/29617089428.pdf
    • https://stalbeckers.nl/userfiles/image/file/somajuwoputimafeji.pdf
    • http://bezpiecznamlodosc.org/files/file/92726003644.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16092c036cca74---jawarijifipebe.pdf
    • https://ecole-anglais.com/upload/files/gozebusixu.pdf
    • https://alteanetworks.fr/img/file/voridatoxowababugew.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/86902793d270969b48e0f07bfc8c83fc/tuvaxitubowuvaxilorarot.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=post+d+and+c
    • 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_off0000cd60.bin
eb79b941d834b3d875e003c12b2623e6be3c9ef82188ce72b9bfc283061face5
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD60 18668 bytes
font_01_sfnt_off0000fce8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE8 16792 bytes
font_02_sfnt_off000114fe.bin
49d48415fd85dfb5bfc42c5a451c207b259a162743a875e1e7be55157d50b956
pdf-font-stream PDF embedded font (sfnt) at offset 0x114FE 9996 bytes