Malicious PDF — malware analysis report

Static analysis result for SHA-256 7edec636f0f06744…

MALICIOUS

PDF

71.8 KB Created: 2021-09-07 11:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fc20d8a73e278743a859a10055ae7a76 SHA-1: 2847a69543eac8592104cc0881b1d3ddaf9675c9 SHA-256: 7edec636f0f06744fdaa9ab82e8360d16d09b84e3629463a70eefaba919f4e62
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on compromised websites and potentially disposable domains. The presence of multiple unknown PDF files suggests a distribution mechanism for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://xn--fiqa735be48e.com/upload/files/xafugipepitewineb.pdf
    • http://bartuceviri.com/userfiles/file/22272684505.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607031ef1db29---62284730661.pdf
    • http://ktcz.eu/files/files/36972519546.pdf
    • http://ytovietnam.net/ckfinder/userfiles/files/gusuberulumubufaxamober.pdf
    • http://beergolfers.com./blog/images/file/83359822737.pdf
    • https://hzautomatisering.nl/userfiles/file/meromorubum.pdf
    • http://denprokhorov.ru/images/file/damatizudikiwipefom.pdf
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/mirisumoxuvif.pdf
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/motemalimafebibafegixog.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160be758c88811---lasinepozexepavotufexiv.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db90cd7547d---60142519430.pdf
    • http://csc-020.com/userfiles/file/20210618190313_g5i11d.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/91949dd68c12a6c7cc9ca9c98a3bb5a3/28220574092.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083fb608316e---14364297223.pdf
    • https://stmpallet.com/ckfinder/userfiles/files/90676149147.pdf
    • http://islandpointfl.com/userimages/jomuton.pdf
    • http://digifast.cz/userfiles/jukitusodig.pdf
    • https://billard-hauri.ch/userfiles/file/vawax.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16074934ee5ca9---wejipejonakozufuluzunefez.pdf
    • http://knowleangling.co.uk/ckfinder/userfiles/files/36428963365.pdf
    • http://orderbestwings.com/uploads/files/zanutodorexokamaranotiju.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccf035d25c---gafotuva.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a84b0b7a9a8---gozavagekipipibolesujetem.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=buff+dudes+bulking+plan+pdf+free
    • 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_off0000b777.bin
a98fbdfdfb36e47c58e908ae048f4dcbc509d266acc1255e22535ba75c4abf37
pdf-font-stream PDF embedded font (sfnt) at offset 0xB777 10840 bytes
font_01_sfnt_off0000d01f.bin
3fd75a938c4a478b93e153281bbfd20febee0f30363de37bbb550537620d42c6
pdf-font-stream PDF embedded font (sfnt) at offset 0xD01F 16064 bytes
font_02_sfnt_off0000f98e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF98E 16792 bytes