Malicious PDF — malware analysis report

Static analysis result for SHA-256 3edef91b8b1ac37c…

MALICIOUS

PDF

86.2 KB Created: 2021-07-01 10:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 13668e872422ca8679f3f98a0b20ce92 SHA-1: 0deb685859e50e9b59ad27e518af707302db2757 SHA-256: 3edef91b8b1ac37cbbd1bcec3bdcbf6f56c75b8289761a3dd2ab9b97545e3902
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The file's structure as a link farm suggests it's designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://cardion.dk/gfx/fckimages/file/46255472994.pdf In PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/45238839554.pdfIn PDF document text
    • http://apricomm.com/userData/board/file/zokulifad.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/65aac35604349cf0545cac1d1aab2e75/zoxipogit.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160adae928869b---mizuboguwabofolitat.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/71266000880.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/450304cdee2233a917ec5f4a101bddc4/54495550660.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c3e45aa77---padutavevuk.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/ab847ead0c24b4fd694efc01f35d593d/volulaxamilike.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/tigulatimamanovuxa.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eca19f1646---46164938445.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4234c34dd---17040196904.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c968acdcc3---remuwajobunetebu.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0e008306f---70850898035.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160add95ad692f---5316807066.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/zetiwamep.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/kl39c730qr0thns5cg5dqelcg6/40812432913.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/vegojebuzixukore.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/fefb08bf4c35800cd2ea5ab35d0f9cd0/xefomirojusadejuburexa.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/wezoxizo.pdfIn PDF document text
    • http://markone-tools.com/upload/files/18706093953.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609af91507c80---6582809634.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=unworthy+of+your+love+sheet+music+pdfPDF 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_off0000ecdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDB 11096 bytes
SHA-256: ea78763d371fb97dc8d5577b845ad698972fcda3db522ac0f1921605ea068e73
font_01_sfnt_off0001069b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069B 17064 bytes
SHA-256: 686025942334d2ea7d17657c3c36bfe54c92ebd99639841bf73d8c9dd336193a
font_02_sfnt_off00013366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13366 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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