Malicious PDF — malware analysis report

Static analysis result for SHA-256 0108a8fdcb2b24d6…

MALICIOUS

PDF

81.9 KB Created: 2021-09-02 22:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: daf9a6bc0103b246952ed2568bd3f570 SHA-1: a3569330260dcfed21d2d0ec19356c1ea392ecb1 SHA-256: 0108a8fdcb2b24d6d39adf155cfdc627ba96f479925b140ad37feadb4b9b737b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, with no discernible user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b055ca6233a---21285727187.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a59d1780103---vikegikasewomugibuzevewag.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/86f48ffe5dc5954772e03c5cd681e8df/vujawodilirupetifus.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072422e49e1f---zusokevi.pdf
    • https://susta.vn/userfiles/file/85970477528.pdf
    • http://cecev.com/stockages/files/rumirujexosavi.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c183b27cdf---54500902935.pdf
    • http://turagent007.ru/userfiles/file/lotokixigipokimiji.pdf
    • http://onfireinteriors.com/userfiles/mewazoxamasulevevuzevi.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/9c782e42beadc0954ac63f9c1d97ed03/80459337050.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/acdcad7a2f0e611e28b567a7667bce2c/vexifutubopabozipemu.pdf
    • http://bygreenpure.com/userfiles/file/sevomilogapizaxigunut.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081474a147fb---wejitixowuraxu.pdf
    • http://cortabellanews.com/userimages/vitogupumagexej.pdf
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/zufajefoporoximukigosak.pdf
    • https://rrr71.ru/upload_picture/70114424043.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ea9c54ba7---natixad.pdf
    • http://taigesw.com/upload/files/fowufilomet.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160990e7978bb9---gifovajevuke.pdf
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/88401004626.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/ag36cfbahbshmrak0v0cvs74js/69400554925.pdf
    • http://nhs71.com/clients/d/d9/d9c6bfbc4bbdd207836d30c01fe5869c/File/kivadisesenupi.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/04f7297f76c21be9cb6917d893059393/6735843256.pdf
    • https://harmony-lazienka.pl/Upload/file/loganurilulunofokifupu.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16094a288d2037---valonibawarotofagopumowo.pdf
    • https://naoshima-habitant.com/rezajoxopukozafajizideb.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=fluke+179+true+rms+multimeter+user+manual
    • 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_off0000d8af.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AF 16792 bytes
font_01_sfnt_off0000f0c1.bin
615793a7ff8facc0992392bee3bed872434e07fe7365ed039a3e9f80ee066cac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C1 18608 bytes
font_02_sfnt_off00012159.bin
c902849269d3653824b4d78dc20db1426b6e71ab6087b63cceea770d040fe5e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12159 10588 bytes

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