Malicious PDF — malware analysis report

Static analysis result for SHA-256 28bba74b25c61a0c…

MALICIOUS

PDF

97.1 KB Created: 2021-07-27 21:21:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 375757333afb3ce66a9e0a47d394d3cd SHA-1: e7f6dcfa7dab968cdb1b7381fd00f77ce51bb0b4 SHA-256: 28bba74b25c61a0c5523d3a0e4f7da3905edfa12d61072d196901bd864b62831
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to external websites, including those hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack vector appears to be users clicking on the embedded links, leading them to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://yuanjen.com/ckfinder/userfiles/files/zazik.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/8a43f5e1006c1342acca7c25b8798b5f/pojezosixapaw.pdf
    • http://ecoaga.com/documentos/file/72261342897.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2bb6c7052---21352271582.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/icf971rau25ok5a880vf0nu320/nokedupifujidonanemopeju.pdf
    • http://aarogyamedico.com/userfiles/file/ditonasiwoxirusavobidi.pdf
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/magilufivatosizogibokek.pdf
    • https://aquafilling.com/userfiles/file/pavuwulerijiwoji.pdf
    • http://alexlunacoach.com/img/editor/file/kenesinepizalanez.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/3h2q8ip1vtlb8hsonk9nncjo8s/xibipanuxegusug.pdf
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/dozutuxulowebosuwapefolas.pdf
    • http://poetische-malerei.de/web/editor/files/tanaragatoxozug.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/e31948e02b21ab98ee7a9b5f6037fc65/lijakoxejetexawug.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077668d4c54d---mirexokorigato.pdf
    • https://manajrgvaaradhi.com/cms-uploads/files/69326493886.pdf
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/56808674589.pdf
    • http://teaandtiarasmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/fubofibatenibanorexevesol.pdf
    • http://ebiocell.com/uploadfile/file///2021072716045272.pdf
    • http://18554080.com/userfiles/file/ruxibajuxijabu.pdf
    • http://geyikkimya.com/userfiles/upload/file/50386229959.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/2bb7e895fb2c88d04b129b903cab846a/47775522913.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/1d507e017cb14eaf68cc1d8a91a7d0ab/fukudovak.pdf
    • http://ks4073.com/file_media/file_image/file/41308499419.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/66a939502d02d739a3c4ce09562244cb/59136119481.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=pdf+taking+cara+babies
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001181d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1181D 16792 bytes
font_01_sfnt_off00013034.bin
3d74526bf6e847143fd19437f3966fb4b487c11c683d55171834ca404604b4e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13034 10720 bytes
font_02_sfnt_off000148be.bin
1aa315183d4ed6c7626fb0436fd081412deac24143c141f6de4f591afb02295b
pdf-font-stream PDF embedded font (sfnt) at offset 0x148BE 17396 bytes