Malicious PDF — malware analysis report

Static analysis result for SHA-256 41797c6a681e0865…

MALICIOUS

PDF

84.9 KB Created: 2021-07-04 01:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 5cb7c7c7e4ee158c3a6f5985d540606a SHA-1: 477efad3cbdbcff90e6e546881b6ef5e10e21b51 SHA-256: 41797c6a681e08655e393e19a955556cb2ec852e799f51995df8fcb99008bbcd
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to lure users to malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The file's structure and link farm behavior suggest it is used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://aeronautike.com/userfiles/file/28660654644.pdf In PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ndvao2uageitn7491jibb65s9d/50564242726.pdfIn PDF document text
    • https://atl-50.com/files/file/53267514123.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/dedavoxetisurosezu.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/wirobivojavesagak.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609dadbd5f522---jigubavupikadajiniretexam.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/95150493376.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/jijokolirazuzavud.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/towigodowakij.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609865d93d04f---noderunexi.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61917990078.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/jotux.pdfIn PDF document text
    • http://mashtalkandil.com/userfiles/file/juxesavilowekizefepox.pdfIn PDF document text
    • http://freetourscadiz.com//ckfinder/userfiles/files/xapaw.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/27534618234.pdfIn PDF document text
    • http://klpa.net/userData/board/file/74705905781.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d953a0a3d50---62827611511.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/89360173624.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/zolunoxelowirefutaxaful.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/javebidulosizino.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/beeb3bf5e95286b8e3f1124087aad37b/rapufedaxakuvubuwigidemej.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/93772073520.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160afeda67302b---komagelejepid.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/22686862304.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/dunagulafa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=wheel+of+fortune+tarot+cardPDF 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_off0000e96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96D 10404 bytes
SHA-256: 585ac6a4e0be9f090696ebdd8a31313c09c49fc47612fbd384fb2f1f009f0b57
font_01_sfnt_off000100fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FA 16736 bytes
SHA-256: e3da0998a514012dc9b0abcdba1b5605580de5ec310b33fb85f9d985e902f68a
font_02_sfnt_off00012c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1