Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4ae958d12d36b01…

MALICIOUS

PDF

86.0 KB Created: 2021-08-11 04:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 537b408aa65e4c197d84b4ffbf16d987 SHA-1: 86999912b341c3a94249cb910fa074b3b11d81b4 SHA-256: e4ae958d12d36b01ac6a839fdb806bc20dabb2a5bebd8274f19e4ff427f31839
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's part of a link farm pointing to compromised websites. The embedded URLs suggest an attempt to redirect users to potentially malicious content, aligning with phishing or malware distribution tactics. The primary attack pattern involves leveraging a malicious PDF to redirect users to external, compromised resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/88156217332.pdf In PDF document text
    • http://kursadowicz.pl/Upload/file/bakesuxunegovokanevu.pdfIn PDF document text
    • http://allasclub.com/campannas/file/luvaf.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/0b6436351dea543a488986f322e139af/siluzolokona.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/bisowadolap.pdfIn PDF document text
    • http://24cvety.ru/upload/files/nizawasu.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/jipifamubo.pdfIn PDF document text
    • http://instandee.com/Images_upload/files/buxisivef.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb1b80ecad---24552746143.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607976a79a559---bemumewe.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/b36e0422d5487baf30fc7fab5eb14752/sogaseliritetulipaz.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16091d984b682d---duvubosuwitetexoputitogig.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/mimifutugonipusaxabojumil.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/69234308772.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/43a7d4b2d3c73322dede0421b21eee4a/xezomarike.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160e6749486585---3561582382.pdfIn PDF document text
    • https://btegypt.com/file/letunebezetat.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/timetuz.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/jowaboxugoxozub.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/37655984896.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/vilumukofodif.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/bizipene.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/59992102376.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610d44354a6d3---jovujifaxefedokeges.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=mckinsey+case+study+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC14 10648 bytes
SHA-256: 554d11e88abcb8a312547c7b4b0391b1a8f213596c74e863ea61d1aa0f3d900d
font_01_sfnt_off000104a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A8 17608 bytes
SHA-256: c80be6de824d78e03b7f94508c015ac59731a61e5b1d586591fafe7456b24634
font_02_sfnt_off00013272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13272 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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