Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e2bbb63fbc21910…

MALICIOUS

PDF

85.9 KB Created: 2021-09-11 08:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aea88c77f920e6355c47a9c9ab221e84 SHA-1: 6debef38a11d1a3992567a326057f8ec6fbf7015 SHA-256: 3e2bbb63fbc21910b52e3ad654125acb2644badd4723ab66227729073ccb3984
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://yalcinsezer.com/upload/ckfinder/files/dositog.pdf In PDF document text
    • http://studiorumeo.it/userfiles/files/wovinuninarexewukobeda.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/61189734750.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/l18198g5h8359jhjhuhceltgn4/50084968793.pdfIn PDF document text
    • http://www.nena-artspace.com/ckfinder/userfiles/files/vikegatanipuw.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/3797c4c1bf073c948279b83cd070c5e7/34481342652.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9816749115.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/zebejutinuwamovunazovuka.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/xaxefatevuxu.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1631327108.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/zukagotetuwevuwip.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16137e5e77c3b1---vijokuliferufikumemas.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/resujowadusinezaxip.pdfIn PDF document text
    • http://leruichem.com/upload/files/zebezizezasivikamolawaxol.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/23811751704.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/betarixugirawuzawededet.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/julagogovalixitaz.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/nivafokafujigefidub.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1b7cda724---65685583579.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/lafifesose.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/biriduburuzimebujupakud.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/7cbbb9937f553ed69df90a0cc9bdf893/bamatunojopibijup.pdfIn PDF document text
    • http://goref.ru/files/file/povikozaton.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=best+free+android+cleaner+appPDF 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_off0000ea7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7C 10668 bytes
SHA-256: 116785892c1ee9a230207a0f3a8e443b577cb8aa40fc52f3c52c27497e11022f
font_01_sfnt_off00010311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10311 18056 bytes
SHA-256: e22deb431630e9ecc693da02ed7f5daadc01a1deafbce235412e673df4d9345b
font_02_sfnt_off000131fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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