Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d169ec3ca059224…

MALICIOUS

PDF

75.2 KB Created: 2021-07-31 17:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ac203895078b9aa8a125efae059a21be SHA-1: fba256c9f6c0af47d82c6a932674db8683889e3e SHA-256: 6d169ec3ca0592248adf63d66cc7766efad642fc587dd42434309f4034afe5ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://crewmak.ru/uplcv?utm_term=fisher+and+paykel+dishwasher+error+code+f24 PDF link annotation
    • http://egyptlance.com/userfiles/file/galin.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/vokumorovuvujugujas.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbdbc78471---bijulipolitanav.pdfIn PDF document text
    • http://ipublicity.cz/data/file/77750905698.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/26957858216.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/83891805439.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d111da21b8---rorerugegagijitineketa.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/98636811908.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/59083711837.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/najuvejobifosobuda.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/wujafikija.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/kirumax.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/32512940151.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/xekijorizebomewikenem.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092ce2d41ff5---burono.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/2c059212a06778830e48d38f4775f824/tijedufotukuketupaw.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/pujum.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/0be1548835d3e0ca4fb50053048111e0/26899429959.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/86916857157.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160954c2ce4b72---33160420973.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/74438198110.pdfIn PDF document text
    • http://andrewclaymonfishing.com/clients/a/a7/a7b0d980ee28df7184f998a87a00dbd5/File/68712372770.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_off0000c1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EF 11084 bytes
SHA-256: e799ebf63ca1c7cf3b514221716fca23aee33374009919e239d3efe87e6ae96d
font_02_sfnt_off0000f3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CF 16616 bytes
SHA-256: 8560645b6e1504925fe658cb48aac7b17090c60dc1655270101a7d1dee1a6858

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