Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6d8b12661a5ff85…

MALICIOUS

PDF

81.7 KB Created: 2021-09-21 04:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6c7ee63fff0569cab779ba42d9a50bb5 SHA-1: 350bd10937432d0ca94e45679149e2f8af27ae43 SHA-256: c6d8b12661a5ff85ba894de0377f1e9ea0553a531ffcbffcf3157704abfdab83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating a link farm on disposable hosting, suggesting an attempt to direct users to malicious content. The ClamAV detection and ML classifier further support the malicious nature of this PDF, likely used as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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=doctor+who+all+enemies
    • http://tbeaindia.com/userfiles/file/tifujexuziduwinivo.pdf
    • http://france-ex.com/images/blog/file/31252177428.pdf
    • http://prplus4u.com/ckupload/files/58410479062.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/5upfedbvve9vgkphfiinma7cn0/79237374971.pdf
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/zuvebaduvataruwuv.pdf
    • http://dkkarsin.pl/img/upload/files/rikonabe.pdf
    • http://hftyby.com/upload_fck/file/2021-9-4/20210904114906797064.pdf
    • http://studiotecnicopetrillo.eu/userfiles/files/gatubevevime.pdf
    • http://hataylezzeti.com/resimler/files/16889047877.pdf
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/26989468118.pdf
    • http://fli.edu.mn/ckfinder/userfiles/files/34081358783.pdf
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/41987547225.pdf
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/77698945482.pdf
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/51014453521.pdf
    • http://osmed.cz/app/webroot/files/files/wasinevudefinufo.pdf
    • http://poongdung.com/FileData/ckfinder/files/20210905_758500F3CFEBC2CC.pdf
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/zajidox.pdf
    • http://anquocrealty.com/uploads/image/files/941612171.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395a580bb85---tesawezoguxon.pdf
    • https://accu-split.com/userfiles/files/taxosukasova.pdf
    • https://yellowstonewildlife.com/gudafusalipixilu.pdf
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/80392270677.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/3vvjp2lbubiiulomsc6qv8lhi5/56823379207.pdf
    • https://hzautomatisering.nl/userfiles/file/19104882194.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_off0000d9cf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CF 16792 bytes
font_01_sfnt_off0000f1e6.bin
c1fe973c4e9da606aa36291a2be89a167f737986a94e8a76c3c9ff39409f93dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E6 10584 bytes
font_02_sfnt_off000109e6.bin
2fd41da9805f65ec8c72413fd3543e1b6d0995a4782b8b230b85e056a76b1daa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109E6 18320 bytes

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