Malicious PDF — malware analysis report

Static analysis result for SHA-256 6da40bc9d0d1d887…

MALICIOUS

PDF

81.2 KB Created: 2021-09-16 11:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d620cc1bd811187ee6d9a608937625f1 SHA-1: 65b1d36489cc4c7ffb93f7da580684779c37c5af SHA-256: 6da40bc9d0d1d887f53da7306a9e3789f874a9e9b7e832e1276e1c7516fe14c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to infer a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=the+walking+dead+season+one+mod PDF link annotation
    • http://elektro-galerie-hamburg.de/userfiles/file/paripudofole.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/71236004710.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/39841808086.pdfIn PDF document text
    • http://storemisr.com/uploads/files/79197335253.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/guxexowubovapede.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/fakofidaxamewotudagi.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/milajipodefevumupoditil.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/161427fc5315ff---2527601585.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/52012505510.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/neniwozusurunuroki.pdfIn PDF document text
    • https://ganganagardentist.com/userfiles/file/gekalefimorifud.pdfIn PDF document text
    • https://promise-land.com/upload/file/86413674001.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1ae219cda---72118775763.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/4ngj76ks5641aclbfkgfma1ii2/78080225162.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021091215503773499.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/zodexepurike.pdfIn PDF document text
    • http://xn--z92bzy85x.com/userData/board/file/18473778408.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/68636233813.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/62397682722.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/376n8djjqlrm315c3vcb0pk0oc/lonatesamegad.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/xufobawokaxumawufikowafi.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/6524796194.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/41432533256.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/66184238101.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_off0000d829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD829 17820 bytes
SHA-256: f941e9697fd639d3f1c14f3a04778dcb9aee5f89c2f6d6dca513740d0559f700
font_01_sfnt_off000106fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F13 10640 bytes
SHA-256: 24d459ac6d2f023c7ed5c34d25f906e62670a077505fded7f2af4e35429e465d

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