Malicious PDF — malware analysis report

Static analysis result for SHA-256 33000e0546f276bd…

MALICIOUS

PDF

89.7 KB Created: 2021-08-05 19:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9a3319a0dca65cd80eafc03162eee435 SHA-1: 28e43bf6c290dcbbae5de89624f46a8d903a8ae6 SHA-256: 33000e0546f276bd5fb38150d16af1476f44993a6b5748f961696676b10fb631
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but likely serving as a container for the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://drafthe.ru/uplcv?utm_term=bloons+tower+defense+6+mod+apk+download PDF link annotation
    • http://hanifeugur.com/image/files/96022835403.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/14608636869.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/54891243406.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021043004073873499.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075434ea44cb---13496789026.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160db882c447ce---84742571831.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/tatixejalavutebuxuzafata.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/fa17c6d31471569259cf17e081fe2d04/gikekijilevajepikefunu.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/sukebazonegenagonafef.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084b880becae---dunutivefumaker.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/zitela.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/d60be6279bc0eda233460fdefacc7b94/68057847318.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/putagizejufatapom.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/51b98ffe4a27ab08213cc9c271b714ad/49166061450.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/70417123194.pdfIn PDF document text
    • http://xinyuemu.net/assets/202107/files/20210722191410305844.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608782d3a20c2---xojurarezutubemarivov.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/d865b638da6cb7e8a8994754fadd0a5c/tomefumena.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/41922355681.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609747ff2e87a---keliwoposolejemu.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/55886414329.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c07ee6647ba---vumezumubepojutesojuk.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/c47f34933de83a788dde6b37073b3b47/94416278769.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E2 10968 bytes
SHA-256: b4cd1f21d00c468e3f7c9fe76987e8e27b8703e7163cc518312d38284c5388e7
font_01_sfnt_off00011375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11375 17028 bytes
SHA-256: ec14ae7fe6c24834f9334da36b48c994ecbe127517ff043139aaec2e9aa2ab94
font_02_sfnt_off00013ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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