Malicious PDF — malware analysis report

Static analysis result for SHA-256 7900cbaadc1c75f9…

MALICIOUS

PDF

71.7 KB Created: 2021-09-19 22:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fa19cebaaab6b1156735526cc1979fff SHA-1: 30d9d791f08485ccbafb7d3550ceb301fe3de42c SHA-256: 7900cbaadc1c75f9266f39b674e64b86eef025674c8075ad0915cae24fc93afe
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 directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of a link farm designed to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://makesomenoise.hu/upload/file/miwuxajokemunej.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/vrvmao5o5tfslp8o81tdq53213/19292050830.pdf
    • http://kleiberit.ru/files/file/61962206332.pdf
    • http://orel-trinity.ru/sites/default/files/file/75595194203.pdf
    • http://stamforgtechnologies.com/uploads/16104633041.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16143adf46200a---gowoxuxewowe.pdf
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/xabenuwurolibamosurila.pdf
    • https://appvid.eus/userfiles/files/51745734043.pdf
    • https://toananhmedical.com/uploads/files/56616642546.pdf
    • http://inarchengineering.it/userfiles/files/tenetunusuze.pdf
    • https://lensprovn.com/ckfinder/userfiles/files/koref.pdf
    • https://patoman.ro/ckfinder/userfiles/files/tivuzele.pdf
    • http://eskuvoiiranytu.hu/blog/file/70068289993.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/3796a99fb0bf1140fefa72de7533df80/witexetapomujis.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/n5b3596htjn329jhim78h0mv86/43095918294.pdf
    • http://ametansk.ru/uploads2/36972972196.pdf
    • https://trompis-tondschungel.de/userfiles/file/dedereb.pdf
    • http://aristosaigonhotel.vn/uploads/files/lizojid.pdf
    • https://thibiditrading.com/public/userupload/files/10871627823.pdf
    • http://fobas.cz/userfiles/file/58337455661.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140ddc6d0a1e---rodeluvevela.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=where+can+i+watch+maze+runner+2
    • 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_off0000b483.bin
0dcd90229e5a45de63b907ce1231ec12ddfed730dc7a05914afecd6e8bc0cc47		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB483 17364 bytes
font_01_sfnt_off0000e189.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE189 16792 bytes
font_02_sfnt_off0000f9a0.bin
6af19d37cf835f6c1dfb001f1daaf36acca1d899cb3a6cbd31b4f2fe5899d142		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A0 10520 bytes

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