Malicious PDF — malware analysis report

Static analysis result for SHA-256 c66cb9bff88e1df1…

MALICIOUS

PDF

92.9 KB Created: 2021-09-13 03:21:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dfa4836150b48ef9a2c41714a3c1fff5 SHA-1: 2a0e2d14d515ac7df9722bf9b5be3a379026e7ad SHA-256: c66cb9bff88e1df186f8abb94fed660301d3bed84b29b9a876050f2a638e6392
196 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads or disposable domains. The presence of 'LOLBin token sequence' suggests an attempt to disguise malicious commands or URLs within the document text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://mega-treid.com/userfiles/files/jusawuketawanuxanig.pdf In PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210912_8066B2F837ACFF47.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109101533038409.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/31385011833.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301bcbf2085---6695047378.pdfIn PDF document text
    • https://egca.fr/userfiles/file/livofiwigexomolupumeg.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/raravapig.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8b6e143bc---pamebinem.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109130503361533.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/39354643157.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/72223757117.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/p0d2cmdu40b41n5m6nptkmeql4/rozawakezawex.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/goletujerezepewa.pdfIn PDF document text
    • http://proxkimya.com/resimler/files/nogugodezumozir.pdfIn macro / runtime command snippet
    • http://cluboutletmoto.net/campannas/file/tiwuka.pdfIn macro / runtime command snippet
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e370255419---53162615364.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49565356072.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/rasud.pdfIn PDF document text
    • https://led7.ru/file/bujosaxemexopokamuku.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/73670660999.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/voxaxivop.pdfIn PDF document text
    • http://mutitar.com/user_img/files/9491952610.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/dowoponunem.pdfIn PDF document text
    • http://madinagirlsIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=karaoke+making+software+for+androidPDF 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_off00010951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10951 10820 bytes
SHA-256: 4d61c2737367469150fda3bafad207157ba6a27564ed9576bbaed5ddf0042794
font_01_sfnt_off00012221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12221 16892 bytes
SHA-256: 0f120a2c0ca2925fe2d80213d4f1ef3c71222782a026dd21e4eef009e795fb47
font_02_sfnt_off00014dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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