Malicious PDF — malware analysis report

Static analysis result for SHA-256 3da341f5e15e04c1…

MALICIOUS

PDF

78.3 KB Created: 2021-08-30 01:33:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d4c7dd0f0637ec87ec92e70bb7ac21bb SHA-1: 4f9801ef23a9952c3dfec32b444758f988c0a6c4 SHA-256: 3da341f5e15e04c199357734d61388f97c5280260932df1d57278adbb4207c63
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs further support the attack pattern of a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://adacu.org/userfiles/file/20210618124727.pdf In PDF document text
    • http://effektfilm.de/files/file/31870354465.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/27171540360.pdfIn PDF document text
    • http://arlington65.org/clients/880802/File/nixatipelipiviji.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/moiaovhld7ev8pl11rio14lukp/28090844679.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a84b9809baa---kobipoxusesekugorajuviz.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9eccb4ba8---17606575660.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/d29f4d9bfedda8ed6f219f71cf16ee29/gigafuwupepuvako.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d1c218998---mufilevagi.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/squmuaumpld5g0vugram9n81c2/litezujawobe.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/57948470579.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7658709946.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080a808a0ff9---tapurazumewakanufigokeron.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/10712839272.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160adcdb395640---todugo.pdfIn PDF document text
    • http://ciba.lv/uploaded/file/sexapikizodelewezus.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ee4b12baf44---fexasafane.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/wuseda.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/saniperuweti.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16110007bba4bb---gepagowanivege.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d364840ee57---gater.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160702ce9af9cb---2783124909.pdfIn PDF document text
    • http://umhouses.com/uploads/files/fofif.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ed9b06c2c---84859421722.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/82777827231.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202107070321083683.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=team+fortress+2+parents+guidePDF 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_off0000ce17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE17 17000 bytes
SHA-256: 1be73888fcf49107b8f35c4def29a219e8ee99beb7813aad3995b7a4fbc4e480
font_01_sfnt_off0000f9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D0 10980 bytes
SHA-256: 25f55690885566181874f75f8269d2e46df5fc92e3d9e474179eefd5d9bb4fa0
font_02_sfnt_off00011327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11327 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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