Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fdcc19417c1fcd6…

MALICIOUS

PDF

83.0 KB Created: 2021-09-04 21:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2f79a6b69285b957e6ffd5ed8ea83ec2 SHA-1: 9e6187cc1a26a949de76f1a71c29c705b859353b SHA-256: 8fdcc19417c1fcd65ed529f3fbb304a54d1fe49ab8b15e4473108650c9cc3e7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure and embedded URLs are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=economic+growth+of+south+korea+pdf PDF link annotation
    • http://goldartline.ua/userfiles/file/84008527809.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/6e0f9d95dd0a3c8d3f033beca5f4c698/32264078057.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/vuwaworupipij.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612182046852c---92927027428.pdfIn PDF document text
    • http://muszempilla.com/files/file/42386903252.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160d3bf3a5a5d6---giwokejilob.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073c590a10fd---45308951749.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/68805111935.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/95850dc870d5468baf267a44dfa40977/rorimatamopupu.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/bikus.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/36087515011.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/47292458742.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/nopenepozotujagurugotokiz.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/sunefuwagizukanagumez.pdfIn PDF document text
    • https://tessuno.com/upload/files/60e2b99907822.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/kugetite.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/taroziduruxosolidawupu.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1611a17c48834c---57832785136.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/40451787224.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7664be4e4---xidatenogukawuwapadegotaw.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/52869055614.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/vafelemen.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/pumanajavigev.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_off0000dcc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC3 11280 bytes
SHA-256: 9fd3fdcb41c3617aa62fa2d40f4e2063e70abeb092a0cc8f794ddf5e1771aaf4
font_01_sfnt_off0000f6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E8 18228 bytes
SHA-256: a632cb7976b8e2c908a8bee5a829f1f512520b3a4272657d655ed177893da121
font_02_sfnt_off00012607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12607 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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