Malicious PDF — malware analysis report

Static analysis result for SHA-256 0df0d8538e467123…

MALICIOUS

PDF

87.0 KB Created: 2021-09-19 21:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9d645bd78426fc2d87e9625f15782fe9 SHA-1: afee3a45d0250b081519ef56af28b4592442723d SHA-256: 0df0d8538e46712349a7aa629a91d20e47b19ee64aa62d901224152d4e16608e
156 Risk Score

Malware Insights

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

The file is a PDF that contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://leaguengn.com/userfiles/file///levekodolojit.pdf
    • https://epagneuls-bretons.fr/caningest/images/file/bazikowotu.pdf
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210906184552.pdf
    • https://vidaleve.net/ckfinder/userfiles/files/dewad.pdf
    • https://eastmangroupllc.net/ckfinder/userfiles/files/95443773301.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/161351f43aca62---10756636522.pdf
    • http://benthanhsgfarm.com/images/uploads/files/63682652877.pdf
    • http://mabo-meccanica.eu/userfiles/files/sodikubuwigaba.pdf
    • http://sfipl.in/userfiles/file/kujimoretagon.pdf
    • https://taxfirma.com/userfiles/file/vebemupijavenamatanis.pdf
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/bolasofamotifelusokutuju.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/co167o8m9nlvsan8olkamdmh94/nabafujazapidegulevar.pdf
    • http://projecthouse.bg/uploads/CKfinder/files/36118714997.pdf
    • http://ambulatorioveterinariocamali.com/userfiles/files/tikedip.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab8c0ba731---waforonunomofafof.pdf
    • http://355353.ru/userfiles/file/85136389754.pdf
    • http://vladekoservis.ru/files/3937777613.pdf
    • https://nevisnews.com/userfiles/vabab.pdf
    • https://pima-alarms.net/slicice/file/wamaw.pdf
    • http://maekalocal.com/Maeka/UserFiles/File/bamukufa.pdf
    • https://champion-osk.pl/userfiles/file/53441039261.pdf
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/96380501594.pdf
    • http://industrialdevices.in/uploads/66989510479.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=new+bhojpuri+movie+2021
    • 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_off0000ec87.bin
9a692b2d299d0cd846f95607af3e5e37a1b0a9713be48b6b5617595ae597bb86
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC87 18916 bytes
font_01_sfnt_off00011e0f.bin
27e1f61e9dd39aba24c38599dffb8720b4e37f285a35b4e80c0a76759ebbf11b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0F 10732 bytes
font_02_sfnt_off00013686.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13686 16792 bytes