Malicious PDF — malware analysis report

Static analysis result for SHA-256 16965f133b474893…

MALICIOUS

PDF

86.1 KB Created: 2021-06-10 15:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8fc5371dcc93c6333b3e7eff44cc257 SHA-1: 3a491cf7a402689e7c0802c05b005dd012b6c7ff SHA-256: 16965f133b4748931e84226d9ea4cc60a765ebf692c76d16253f38794cf89b88
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document employs a lure of 'non profit organization accounting questions and answers' to entice users. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting an attempt to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://pixomot.ru/uplcv?utm_term=non+profit+organization+accounting+questions+and+answers+pdf
    • http://notarbrazda.cz/userfiles/file/tiporuvajikatami.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb2f397a22---94001778825.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb863e4004---tofexizetowabiwub.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e20ea2ac6---jabixo.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808198705b0---63575539144.pdf
    • http://www.yoko-ono.be/images/userfiles/file/wobodewe.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c05bbe4c28---moxotujap.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/09d7d37b13d475d5de827d717a76a76d/fisofenorizemiwavuxekib.pdf
    • http://trendymamy.pl/userfiles/file/zaloxil.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/7cde24efce4990646b2a552c47eb9eca/wiwawamebo.pdf
    • https://airflow-skateboards.com/upload/file/getafodujegawuxogiriperi.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c02c648138b---34630649354.pdf
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/664c3c8c2df259cc17e32a00233c8c12/66356957541.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL
    • 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_off0000fa4c.bin
cb9bcc4ec8cb12878a2152bce455ac332c2ffc76ab67713d73a2b15d37859472		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4C 5528 bytes
font_01_sfnt_off00010d43.bin
613f688f581d821b5a00afe97ec57f4ff8b0c93901cab8d0464fa00fb8bd3cf9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D43 11848 bytes
font_02_sfnt_off000135a7.bin
c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135A7 16164 bytes

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