Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9736c8a3894a3fb…

MALICIOUS

PDF

82.6 KB Created: 2021-09-10 14:18:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 9acd571d7e2f61b5ec5acdb150fc0154 SHA-1: cfc8f3f2c1cf3a86aabc73e3362be4fea8da1cde SHA-256: f9736c8a3894a3fb708dea6fe3d0e6ac99c9d38692078afb32d064b849aa64c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external PDF files hosted on various domains, some of which are associated with compromised CMS uploads. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF versions of web pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://adikketiga.com/contents/files/22080258543.pdf In PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e357656fa---55477903142.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/galibibunal.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138da419c602---91428522418.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/34563340775.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613317b6831de---rikosemufulupu.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/4183091592.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/dadivis.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/wogujul.pdfIn PDF document text
    • http://valeneighbors.com/userimages/97121956246.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210902125150.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/vabilafodufuzowesofapanav.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/61750800279.pdfIn PDF document text
    • https://majubesar.org/contents/files/gagotibazolowawilixekali.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/zaruvagibuwezedaxo.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/zajodoniridotixoza.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/kiwerebuzigonupunad.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323a7da2c9c---batafaxukebegis.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138c59901688---67671944964.pdfIn PDF document text
    • https://limsurdua.com/contents/files/46248562521.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/0f1bf4801d522216668314fbcf8cef55/zumapobokix.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/75891965928.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=msp+codes+2020+unusedPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000c18c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC18C 18124 bytes
SHA-256: fa0a80d764bbc33d471ea9cae1bfa978ecb436af66e96ca322553129d00c0448
font_01_sfnt_off0000de58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE58 17940 bytes
SHA-256: 69c23c4da41070f2e6d7859d3dd7ec8dfa86be9ae416396c709a7a347760ef3e
font_02_sfnt_off00010d2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2E 10344 bytes
SHA-256: 8123b8c5dcfa5e38f92e6f2d259ba106bbae6e4ff0da36b26f6b08efdc109067
font_03_sfnt_off000124b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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