Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbe3a4ae0d2b56b8…

MALICIOUS

PDF

74.0 KB Created: 2021-06-29 05:33:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cd153dc431352c529524129e66a47749 SHA-1: e5ec8fefeb79ae32b8bd5901894a1f72b127bf7d SHA-256: fbe3a4ae0d2b56b8fe680ecc2f5f44cb6ebebf0429fbfc500f907e606f8a504c
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting it's designed to redirect users to malicious content. The PDF structure and heuristic firings indicate it functions as a link farm, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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
  • 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 http://turagent007.ru/userfiles/file/mirodanasuliz.pdf
    • http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/5037377064.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/875f035e9c9f81fd14b552800b718db2/92337006591.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/9f82622a4f3f9252238aba956f2d55ed/dexukoxir.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16091ac9078823---xuwuna.pdf
    • https://fa-vietnam.com/webroot/img/files/kedawevibotokenelilavare.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c55097a398---7521943996.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a95c1d5e6a9---vusulatiwigusakidisano.pdf
    • http://614move.com/clients/4890/File/janof.pdf
    • http://ownlines.com/upfiles/file/pisaluwovixowumizefovini.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/328c3499486f2f0af16318baf96ef249/wetoj.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/d8737f6ae6827f16094b2643b02065f1/75670845336.pdf
    • https://clubesolbra.com/uploads/files/powutizilogix.pdf
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/21966605910.pdf
    • https://betenenergy.com/sites/default/files/file/gijemenuwomupif.pdf
    • http://hgbs.de/userfiles/file/52226488091.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/v677e6987l190c5r9jhv0neen5/15202887417.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911aa913454---15391065690.pdf
    • http://sergey-yushkov.com/pict/file/19599491960.pdf
    • http://designpavelzapletal.cz/files/file/66192021752.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609044f985e68---81869525719.pdf
    • http://aristosaigonhotel.vn/uploads/files/4178209131.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759ac2a94c0---63411793443.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/kq2egdmjukphj6dumatkvovrh4/mowew.pdf
    • http://thietbixanh.net/uploads/files/97355890656.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=united+spas+s300+manual
    • 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_off0000be2f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE2F 16792 bytes
font_01_sfnt_off0000d646.bin
13ca4178319ae3d38eb9220b56ea4e728c9805812a05eee0a193771235a83a6c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD646 10736 bytes
font_02_sfnt_off0000eeec.bin
8e25a6d4378228fa0ae302bce5952c22edf66d62d7fe2d36358719f0301106a3
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEC 16888 bytes