Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0cac537d8d5f835…

MALICIOUS

PDF

71.8 KB Created: 2021-07-20 01:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0a372203fd59358e2b13273ae8f88d4e SHA-1: 0adad5a441da2b7fe353bdcfc28c50d053987e19 SHA-256: f0cac537d8d5f83567590cc9ad4a0d89ba4c9dd9ab99bbfd806b039a1adf2ee6
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. Heuristics indicate it functions as a link farm, pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The embedded URLs are likely used to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a6e5afee3---vosidesokadelupevelule.pdf
    • http://bindashnews.com/userfiles/file/32284049666.pdf
    • http://rld-carbon.ru/file/gixulot.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/r9gqeeasbrd6iiavdt7hnefrjr/vewemebimi.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/4899f9a504e6dbbd04a4df2871430bb6/72183483565.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d19579eb5e6---xoxopelapunagedovugaxeza.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d19492dd93---segamaniweboxi.pdf
    • http://animalscipublisher.com/files/upfiles/file/lipazokipimax.pdf
    • http://bona-agra.pl/Upload/file/62596151765.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e955791bc---zerabebebomiwerodal.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7dfbcc926f---gaxatenokidivitovezid.pdf
    • http://lmyc.net/clients/875386/File/fagit.pdf
    • https://osikovo.eu/webroot/img/content/files/27641885363.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8977d1e628---61121473916.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3a691d096---87624855166.pdf
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/42785863631.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfefe60261d---vanegowikaxelenugoxu.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/rl3o1e4b3rholdn6em995satt4/30153893687.pdf
    • https://prastosten.se/anvandarbilder/95/files/tazubad.pdf
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e78f21f4---zodidozamosemevolojaxunen.pdf
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/tavuxakukame.pdf
    • http://gtshotel.it/images/file/37073546666.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=the+perimeter+of+two+similar+triangles+are+25+and+15
    • 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_off0000b66e.bin
53a171ea487da34374b358e867bf280a6e7b973b450ded3334cd02b92e74a938
pdf-font-stream PDF embedded font (sfnt) at offset 0xB66E 11300 bytes
font_01_sfnt_off0000d0c8.bin
9ec230adb0eb494ffedea8da496e89842a8b9ad64703abc8c41a1488ed07ba96
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C8 15860 bytes
font_02_sfnt_off0000f9b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B5 16792 bytes