Malicious PDF — malware analysis report

Static analysis result for SHA-256 9176d5a5b52381e4…

MALICIOUS

PDF

85.8 KB Created: 2021-06-29 05:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5b3adbbdd4e234a459e83cd2888f9a53 SHA-1: dfb9349acc29e388a8364efdd272569575c2fe6a SHA-256: 9176d5a5b52381e4017cf742873598c38cd6e4a48d502ec1cb3d9b33ed835242
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The presence of external URIs and the overall structure point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://crysiq.ru/uplcv?utm_term=i+need+your+love+more+than+anything
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/15901cf35f92631e9b3a2852fc6b3be1/kuxeburofomesi.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/73e8a5bf0ffaa85b035c18a431845512/35574553787.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2ee308bbc---39890176194.pdf
    • http://s-privod.ru/userfiles/file/vumagutukub.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/bb53bea54d589266aa75f9887132060c/wowiginogemepaz.pdf
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/7677ccbacfa12842cac6e9696f435b8a/86613764146.pdf
    • http://nyett.hk/uploads/news/files/kekibiminawejudixisukav.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/41c5nuffsce8h7p0d6kk1pgt46/95818330870.pdf
    • http://hyderabadibiryanicorner.com/admin/images/file/52808298261.pdf
    • http://moyamoya.center/images/hand_uploaded/files/82475151658.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87582ca8e8---koxadudolipida.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/88518e33fd7f5b9be1fdb997a567988e/58808695607.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/8b55744a5461958ec9d1a5bef5616e7f/vapoxegewezukerul.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/e365641307edfa0a4caa9ecc17c525e0/98103517251.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/a6uemh38dpctp54c3co5u4p8q9/zidikizite.pdf
    • https://numberonerevolution.it/file/25615650896.pdf
    • https://activepymes.com/pub/file/55733149184.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ace6aeaaec0---11468527721.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a75fc99320d---bomupelivewakewoliba.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/8hfaa6et6vinp0pc84mfano376/jiwapedifoso.pdf
    • http://bet-balance.com/userfiles/file/4513709514.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/51e8cc73d78de845aefd9ffa3c6d3a5a/pixegukade.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/c0b1d7930e25e8aa0ba60d77f346a722/rugezipibofujenoru.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_off0000ec31.bin
e08f6bd185909ac21d4c936d45eb7264fea2db9da0d0b7c5ed1009a0b7d6ee2b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC31 16828 bytes
font_01_sfnt_off000117bd.bin
2c2d3ea51ecbb93cfb9d2a7f3a78b3bb30e3c873fb9cfe648ce46ac602985fde
pdf-font-stream PDF embedded font (sfnt) at offset 0x117BD 10760 bytes
font_02_sfnt_off00013010.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13010 16792 bytes