Malicious PDF — malware analysis report

Static analysis result for SHA-256 58f1cb9da4954f0f…

MALICIOUS

PDF

92.9 KB Created: 2021-07-14 06:29:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 12b3f2e8ebb4b8e56a6714d91908d5c2 SHA-1: 16f0e2ed03f08a23c3ad3667edcae63bea3fbc91 SHA-256: 58f1cb9da4954f0f2bf70d090e6a312914a9c3d690ae8494c59333435ffa01c1
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to numerous compromised WordPress sites and disposable hosting domains. This suggests the document is designed to lure users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d219b738fad---66048876376.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be7085ea578---84797044943.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/pvce89viv6cgpb9nuuu9832ob1/14851131366.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/acc10b82135e9c2440ed1c2c012b314c/41665146564.pdf
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/83219265187.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ej0okb269dourhugfs9rpfi4u4/97043011082.pdf
    • http://thuexe7cho.vn/upload/files/22104972056.pdf
    • https://thefertilizerequipment.com/d/files/25418958823.pdf
    • http://kusadasidentalclinic.com/img/userfiles/files/41457174904.pdf
    • http://abwcoliseum.com/uploads/files/38949250093.pdf
    • http://erdivigado.hu/userkepek/file/rudojajajufovutinixapep.pdf
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/11290420659.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab650495fa---14070214742.pdf
    • http://andrelandberg.com/userfiles/file/mududirokofemutoluw.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/bmratdr49etmbf01vhf224amtq/89666293985.pdf
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/34083217262.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/f27b9a4065d7e834654bfd4a4a38b936/sogutes.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/74502cf983fc2705d119ab02377c60cc/lobexujugujotulano.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/uf67n139pied3ts8t258mb5qvh/76829081572.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/vtfha0p92u55vkg6207gc1m0kp/bifokugunaborerixesumagid.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/7pi9d2eatbmt7enbmjqmoeam3p/bazazovajowosuwe.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/bf99c6c921154320b2b248241f94a5c7/67557723353.pdf
    • https://go2germany.ru/files/file/xozomoxut.pdf
    • http://tlumacz-lipno.pl/pdrzewiecki/files/76538395568.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=charpy+impact+test+standard
    • 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_off000104b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x104B5 16792 bytes
font_01_sfnt_off00011cc7.bin
d4496fb9e9adf744b8ebf429b59a84f7416301277ec857f47a749229c2b33c9d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC7 18024 bytes
font_02_sfnt_off00014c5f.bin
2fa9933d35c4c665320ac48415386cd8c076d88c67db8676933d12385358590b
pdf-font-stream PDF embedded font (sfnt) at offset 0x14C5F 10760 bytes