Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af186a375ad63b6…

MALICIOUS

PDF

69.5 KB Created: 2021-09-26 18:14:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 61f2d1a7044684268047d79b1b24d84a SHA-1: 7e1456d443ccd1756da2ed0e468a2a3fe780e816 SHA-256: 4af186a375ad63b672fa18b6ea0cbff7a63cd964f9956103f67091a11ec1995e
176 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. Heuristics indicate it's an image-only document with a click-outward action, designed as a link farm pointing to potentially compromised hosting or disposable domains. The numerous embedded URLs suggest an attempt to direct the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://abwingsbuffalo.com/uploads/files/mosupesuwakis.pdf In PDF document text
    • http://moristas.com/userfiles/files/pakuwalulegivud.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///buxewoz.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/fd1604fee0b77ad603d2963158e87748/36594735117.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/tovogepitiba.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/saduxutarigisowubu.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405e366ec91---665280710.pdfIn PDF document text
    • https://jjpremiers.com/files/dogerefogemusudodazu.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/nagire.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/movuxonejurivasudid.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/32626449395.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/48540577079.pdfIn PDF document text
    • https://seger.cz/userfiles/file/selorabu.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/10321937505.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/19174894614.pdfIn PDF document text
    • https://arbormaster.us/uploads/files/nokenupipemak.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/83827559471.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/98210465020.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/79052962803.pdfIn PDF document text
    • http://samtle.net/ckupload/files/dogaligebilujijebefat.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/10448149808.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/rulafose.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16148bf7f11b59---mupuj.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/20219418568673.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/sefimupakes.pdfIn PDF document text
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/xegirowusoxeluxaguze.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/jolamipiwuliw.pdfIn PDF document text
    • https://partnermind.cz/images/files/24348964199.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=poco+m2+pro+vs+redmi+9+proPDF 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_off0000b3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3AA 10620 bytes
SHA-256: edecdb63f690023764cdbf0b960ae621f1aae60ad6a9f02d50f197e4eafd478d
font_01_sfnt_off0000cbff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFF 14472 bytes
SHA-256: 0e97a3b66fda468306fa838e105a8a16e6763135d7d2771802eebd6bfd752d35
font_02_sfnt_off0000f040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF040 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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