Malicious PDF — malware analysis report

Static analysis result for SHA-256 73a0b9171026d633…

MALICIOUS

PDF

82.9 KB Created: 2021-09-20 10:18:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: baf60b4008b686348867e81ec51d7b1c SHA-1: 63a5a51dac9ae20da665aee370049e8405bad09b SHA-256: 73a0b9171026d6337628b384899527de7c3128bdbd46102d51c5db81fe58bf74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to websites hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://lrm.mcdonalds.ua/ckfinder/userfiles/files/82552633791.pdf
    • http://dmhu.eu/uploads/uplib/file/tonam.pdf
    • http://888chji.com/userfiles/files/tomukejevejovimutupat.pdf
    • http://www.koeru.eu/failid/file/biridixiravudebamer.pdf
    • https://dichvuketoanvn.org/uploads/files/71398927951.pdf
    • http://kutyasturak.hu/images/files/61410978963.pdf
    • http://eggtesting.com/admin/uploads/file/wasesivobigun.pdf
    • https://limsurempat.com/contents/files/pozovuduferunilo.pdf
    • http://runo34.ru/attachments/file/pifawumekuk.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8e42a6c5e---4866837648.pdf
    • http://bongoes62.dk/userfiles/file/22677118091.pdf
    • http://tjjjsh.com/uploads/files/14308061365.pdf
    • https://tranduongauto.com/app/webroot/files/images/pages/files/31756018131.pdf
    • http://solarhomepage.ch/fckeditor/editor/images/file/sodorilodamajexet.pdf
    • https://rallstarawards.us/nbloom/fckuploads/file/78287303098.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/c077e859c0fc58f97df15ddfe027bdce/9978745924.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/ef1bfff64c52f6b68abc7736727df7c6/lafizobuk.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139dbd7c13fc---767437263.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141d7a035fb6---6918117468.pdf
    • http://lamekatus.ee/uploads/ckeditor/files/lofusol.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=rujuta+diwekar+pregnancy+notes+book+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_off0000dccd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCD 16792 bytes
font_01_sfnt_off0000f4df.bin
de358bd46e53fc224f66c1ff8f1a6003df6505108992f43f779ea8f4e4b4447e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DF 18212 bytes
font_02_sfnt_off00012398.bin
da5e81b12ef358dab6f9ff946bd185faa58eb62ea4fabbf80617c2f5f1b14cb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12398 11456 bytes

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