Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c83242efba0e50b…

MALICIOUS

PDF

90.9 KB Created: 2021-07-08 22:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7452633141cce044846b770ba4b72592 SHA-1: 3a71277151df8b935a32a30e16f252a6c23d7cd7 SHA-256: 0c83242efba0e50b0440026f494fd1134ce71ad253aa4a5ee2f0caa49a9bde6e
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a vehicle for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://lolakarimova.uz/ckfinder/userfiles/files/28058810206.pdf In PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4addf2acb0---31608092069.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c10159d884c---vujivetenupafosulol.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/19417452226.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ae115e7fa---koxofagal.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/pcbhqd8mmmiktjm8grgmcf4ih7/71011386580.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/47dd618710274f0b13c8aad262fb53e8/83301881964.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/rivuwafizegabudep.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/fajivoz.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/r4t3sbk0js49acddp51d0huaj7/dazukikokomusiwevepido.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceea6c6dcb---panizomer.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/wufevizajidejomezeji.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c895d8c1a01---fudosodikoze.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/fvt9iq1utb9k3d4l7f7arrvo65/7955107862.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/o8tu6215nu462ag3c7af2vl5pp/faxepepi.pdfIn PDF document text
    • https://samyenngochoang.com/wp-content/plugins/super-forms/uploads/php/files/ps1eh8oicbk519oncvden361me/63461480871.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/anse9jsqrdiqndrjffg18asaq9/5075660191.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/b3c9d63677d70d5f750c47b8e467dbba/21928232107.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cf0cec38a---93017800793.pdfIn PDF document text
    • http://fructusartis.com/i/File/90029815359.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a98b0a8700---48027528794.pdfIn PDF document text
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/3190ca3ba0aac694c02b4a4e0ddc1a7b/nalusanuxuzeji.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/16089430418882---54294462168.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=third+person+impersonalPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC9 21020 bytes
SHA-256: 69c605fdb741ac3f3fbcb6cb98d54874080d5707101c76346f0c551be1c486f9
font_01_sfnt_off00012efe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EFE 10520 bytes
SHA-256: db7ceb08bbf36b3d9f14b97fe17ee1314d9ddff99d482c3005fbcc8b3e3351cb
font_02_sfnt_off000146a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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