Malicious PDF — malware analysis report

Static analysis result for SHA-256 f01f5f236f8ec15e…

MALICIOUS

PDF

74.7 KB Created: 2021-09-30 18:56:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d1a4ecf37e991a85ca9c22f8fa108317 SHA-1: acc2ff3720e4f87fc7ea8ca466fba09dc3504eb8 SHA-256: f01f5f236f8ec15e6bad8ca8a27aa2fd195e7d0ce39bf43c5cc5313dc55db02b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. Although no scripts were explicitly extracted, the nature of the embedded links and the heuristic firings point towards a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://laborke.ru/uplcv?utm_term=melhor+programa+para+baixar+videos+do+youtube+no+android PDF link annotation
    • http://studioboscono.it/userfiles/files/gunilozodegidu.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a53e15e2b---90697277112.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/zarotidomup.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/sujuwijak.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/viziludelotiduridon.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141cae5c71f8---66115634627.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/xinovaritapokijenumevivu.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/zapudagogoravarojafuri.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/72240510159.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/pudiwufinakivagidoveza.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/livalupuj.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/33479834762.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1614fe53635829---ranefojakedofizifesoman.pdfIn PDF document text
    • http://starfishdowney.com/uploads/files/mirewilewajatalawemov.pdfIn PDF document text
    • http://veitali.com/upload/files/64249669000.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161425334a0747---gudigokof.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/dekamudasixi.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/83772500268.pdfIn PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/13487970187.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/88564903091.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/76642883541.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/41614949730.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/goluvuwinikogopasobeva.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5670d71fc---gobazamawanotomaxexojoxif.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16147162542884---pisisivodivo.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_off0000be71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD683 17024 bytes
SHA-256: 56137b2cf56b339d5e49126413020d2991fc2ddb42031aa15801b59f3974650d
font_02_sfnt_off00010267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10267 11356 bytes
SHA-256: 4d22669480862fa4419983077fab6dafdc276dd42eddc27ed5cc47aa831de615

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