Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe2fa21c4e782d7d…

MALICIOUS

PDF

76.9 KB Created: 2021-08-13 08:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 867362ee0cd876964135a07afc427eda SHA-1: 9e6e943c5aa20678b2dfd11feadfbf37b0641af9 SHA-256: fe2fa21c4e782d7de948df987a91595ff0cdfe1001b259625644760507fe4839
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb639ec43e---ronenikenekarali.pdf In PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/13682267467.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acb2ad3564f---73014037879.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/xobavasadizafuw.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/dilajitepunalafiwumijebu.pdfIn PDF document text
    • http://limoride.net/gallery/file/muweku.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/boxab.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/favoleb.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/gabamateto.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16087933a89e0d---56317178198.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/desokuvisewatojemawad.pdfIn PDF document text
    • http://clingac.es/d/files/89262411479.pdfIn PDF document text
    • http://halmar.info/userfiles/file/zutenoguwanikevepomib.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/xitotuxisexekeke.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/7155c280eb1c6cedd49f6fb1ea06484a/92028450565.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/37967847904.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/96584686984.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/wuwexi.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/7b85e55e60f763ff3c59f9cb279a1d6b/notesik.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/57932453711.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/41907491887.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/tulololupu.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/f83392d56e1a6108b9f082f30efd24b0/89509214426.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610fba5845ca7---79753665864.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/4ad1ec5998ebde20abd57e20ce60ec75/koluxugopor.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7895f935b4---49573028998.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/janigedej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=pruebas+param%C3%A9tricas+y+no+param%C3%A9tricas+pptPDF 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_off0000c7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBB 11000 bytes
SHA-256: 9dd9cfde74ceb202fbddb49b538ca2b2f1708977ab70e614d14ab56a9faa2ad9
font_02_sfnt_off0000f8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DA 16748 bytes
SHA-256: 444e4e524ae14162c0725195605123b9de8ad4b6db878274f3cceccf127c8328

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