Malicious PDF — malware analysis report

Static analysis result for SHA-256 897852eaba85dd33…

MALICIOUS

PDF

80.7 KB Created: 2021-09-08 20:07:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ed6efba891d85102a68118ba4b19c68b SHA-1: 1fd00924b7eabe7ee0a9141138af3bd73029320e SHA-256: 897852eaba85dd33f1c905246c8968306f70ecbc970dd100a8eb8cf8008e171e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://lactopad.com/uploads/files/tarofozopaxij.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1613049f079844---rilodurefuvobuz.pdf
    • https://vili-al.com/uploads/wysiwyg/files/57443727436.pdf
    • http://montoaneli.com/ckfinder/files/20738705134.pdf
    • https://csmgh.net/pevron/www/img/file/91917477915.pdf
    • https://makanbanyak.net/contents/files/97702320461.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b517a5d28---momolodusumokovesedis.pdf
    • http://mamnonkitty.com/webroot/img/posts/files/rizulezagejetejoxevitu.pdf
    • https://haruhonpo.com/upload/haruhonpo/files/riditanimune.pdf
    • https://www.ewdel.cz/ckfinder/userfiles/files/25947022784.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161320f0c7843c---84002726665.pdf
    • http://x04ydivan.ru/userfiles/file/93207397106.pdf
    • http://futimisdev.com/userfiles/file/88934474440.pdf
    • https://vntdc.com/upload/fck/file/gunonaru.pdf
    • http://sanraimundo.cl/dyn/uploads/file/23731522172.pdf
    • http://alkanboya.com/files/file///nelanafa.pdf
    • http://megaprestige.ru/uploads/files/10605875909.pdf
    • http://kanizsakran.hu/userfiles/file/pemewekater.pdf
    • http://hamyarsanatco.com/ckfinder/userfiles/files/gugenesiwugetadexukerox.pdf
    • http://lexprikson.com/admin/style/images/userfiles/file/wajefuduzetutafojarimazo.pdf
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/29394142122.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c1098b29c---kamasuzer.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=photography+magazine+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d752.bin
1bb00c176907aafbcf168e5a628e8e3b220cd568c3b5d0b33221091c628491ec
pdf-font-stream PDF embedded font (sfnt) at offset 0xD752 10908 bytes
font_01_sfnt_off0000f044.bin
fc7e2478a7f29956a8f1491f4aa3e666d9ffcdd52a29b5383ff160c7734211a2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF044 17436 bytes
font_02_sfnt_off00011d35.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D35 16792 bytes