Malicious PDF — malware analysis report

Static analysis result for SHA-256 37de623e27e27e29…

MALICIOUS

PDF

72.4 KB Created: 2021-05-10 02:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 462f3f82f672e0b12015e6edbd03a574 SHA-1: 5eeca47100e101cebe1a50bdf81d912ae5136142 SHA-256: 37de623e27e27e29393c501394b1ddb522a95c1b0176ffba9714e37ce5df3437
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, suggesting a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains metadata related to PDF generation, and the presence of external URIs points towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://synerhu.ru/uplcv?utm_term=analise+sintatica+e+morfologica+pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16075453c5a439---16915333037.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa934e08d0---82611621110.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945f5093dec---66211903753.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e01d85299---89510075956.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d835b364e5---wejutoziven.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c62d82fe2c---ragotaraveme.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809df05bb22---liwumubulanejegowufefegi.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16070c75244305---zugupozew.pdf
    • http://anvlaw.com/userfiles/file/24593875844.pdf
    • https://foundryindia.org/userfiles/file/93821417717.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607117e9b39ed---86181857794.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c28d1a13f---mulegaw.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16090750967c49---93971876836.pdf
    • http://begemot-rus.com/uploadfiles/file/2021050305360173499.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d857.bin
309f203368f86efb2f2ce717754f479e1e29e099aa26ccf5a6ae40339e5dbd31		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD857 5464 bytes
font_01_sfnt_off0000eada.bin
d82f2ed5d6894f3668d243a70b0e308cf0b12f0fc0af7b3c7ac2581451cdffcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEADA 13652 bytes

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