Malicious PDF — malware analysis report

Static analysis result for SHA-256 edaf0c356d63d2a1…

MALICIOUS

PDF

83.7 KB Created: 2021-09-18 03:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b37396eb3d6b18ea282d8c41b8f3d5c2 SHA-1: a13b6d8345050986de568d11b4c05c6def6a9a42 SHA-256: edaf0c356d63d2a1df0c53d46e1c981ded22869109c9e14f2f76ae7424379e9c
164 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to multiple compromised websites, suggesting an attempt to trick users into downloading malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, with the latter identifying it as a phishing trojan. The presence of numerous external URIs and a link farm heuristic further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://hongdung.vn/ckeditor/images/files/papolebutuwixoloveme.pdf
    • http://vln.nl/files/file/74301047675.pdf
    • http://zeminyerkaplama.com/upload/ckfinder/files/wisekitiwi.pdf
    • http://innotack.com/userfiles/file/47138386915.pdf
    • http://asupuro.com/upload/save_image/files/98649706249.pdf
    • http://bishnutoursandtravels.in/userfiles/file/tajonuvima.pdf
    • https://triyoga-tv.ru/userfiles/file/gawem.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cfd6471c9---pamavovixizi.pdf
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/7618302242.pdf
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/43177605068.pdf
    • http://visusmarble.com/images_upload/files/57834776739.pdf
    • https://leosservices.com/userfiles/file/30340934680.pdf
    • http://ashokarefrigeration.com/userfiles/file/lumatezaz.pdf
    • http://jtylek.pl/Upload/file/29442078440.pdf
    • http://mega-gold.com/userfiles/files/xazizewi.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/b496ffbfbdf566bb0d26ce667c209e5a/jukuvajuko.pdf
    • https://baoyi-chuck.com/ckfinder/userfiles/files/lezozeganaximato.pdf
    • http://ljjxmining.com/uploadfile/file///2021090221201021.pdf
    • http://cyuanmei.com/userfiles/file/76888696730.pdf
    • http://racecross.com/upload/edito_fckeditor/file/95746846136.pdf
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/xilokapiguvowujolidiwemuj.pdf
    • http://pk.mo/userfiles/file/burisuxotulasodevu.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614188a45f169---xudasixeponasuzut.pdf
    • http://jjw-led.com/userfiles/file/49581417089.pdf
    • https://parlagame.com/calisma2/files/uploads/didunofazadojun.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=lust+and+power+mod+apk
    • 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_off0000dd99.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD99 16792 bytes
font_01_sfnt_off0000f5b0.bin
30cdcb9dc6d9c89d2e9045029009d0e0e26f76ae0fb395f0b9f24c4222da65f6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B0 10652 bytes
font_02_sfnt_off00010e20.bin
8290e121280004b8d83697a1a0180e60bd1080bc84958f3d47b6b51885eb1e11
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E20 19352 bytes