Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb3e8c79a28e652b…

MALICIOUS

PDF

71.0 KB Created: 2021-09-28 00:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e46cf377d8b02e55c907d4759ac03ebf SHA-1: fc5ef600dd9a4d82b7e1920c6bb908e00ab3d3b2 SHA-256: eb3e8c79a28e652b0b6b345ccc5cd4a7bce2536575360f5fb31478d9e8115ffb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm designed to redirect users to potentially malicious sites. Heuristics indicate these links are often hosted on disposable domains or compromised CMS uploads, suggesting a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://laborke.ru/uplcv?utm_term=merchant+of+venice+full+text+pdf PDF link annotation
    • http://hissekurban.com/resimler/files/pufowovogiro.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/80048041743.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/53937408953.pdfIn PDF document text
    • https://andrejc.si/files/file/dojasudujibenokagekim.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/lolinid.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/41c82e84c7dcf75168d0c4664b6fbf74/jasivezop.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/20723905889.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/29028438784.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/69308244582.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/24168296820.pdfIn PDF document text
    • http://kalbaninc.com/userfiles/file/53500234807.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/wegikowixegopa.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16150cec10f016---suzawom.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/nanezonisutononolibizusew.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/povelofeweraziwozijeb.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/70747414154.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/79196829228.pdfIn PDF document text
    • https://slide-bearing.com/d/files/63329666737.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/kawose.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/38587250589.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/7544007775.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/6e6bc4ae2aa5a8d3cee207937e34e923/21324702775.pdfIn PDF document text
    • http://sm300159.agchost.com/userfiles/files/5672336872.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/56960546352.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/nidonaxono.pdfIn PDF document text
    • https://rafautama.com/uploads/file/87522475751.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_off0000b53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB53C 15636 bytes
SHA-256: d9d9c74d2cb4c27448e34ae46f0686fdd2917c7241903dac2a515ee5e2aacee9
font_01_sfnt_off0000dcf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50A 10808 bytes
SHA-256: e97fd30052c9cf0e07f98e3cd8272505db3779b457561145fa7cea520f848da5

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