Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a0aa46482c39c6…

MALICIOUS

PDF

87.2 KB Created: 2021-06-25 17:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e9cfa66c4e798831b2c7e446b61ac892 SHA-1: e827df4425f5e4a33a5b526056cce44bb20bf90d SHA-256: 83a0aa46482c39c63f9760fc45223e8b3fa9ddca5560e45c0bc7d92712173230
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing or trojan distribution attempt. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the overall structure indicate an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://inwebjor.ru/uplcv?utm_term=most+pitches+in+an+at+bat PDF link annotation
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/30760741723.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/73945965814.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082440fe74ab---62692490510.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/f954afec59d8695ef267b84f4a18fa61/18066505564.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11846b3af0---karafevokobolujixezo.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609342a21a42d---muwide.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3ae35b18e---90536959140.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/3keusn2qr0istu3k6irht9fp8v/83918205630.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/gegusuvamitutuzexawivi.pdfIn PDF document text
    • http://weddingceremoniesbybev.com/clients/72651/File/xivoze.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/14173790970.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/f2f6deecdfd9e09f33d225789ae13ed8/51467475296.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/65024609944.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/0nnco6n4qu1th084ujc1r6089g/lonetajesorigewebasotegep.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/27180214551.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c76654e8---romunekotufugibagurezogux.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/559a08c823a3ec202905955715625895/68649337835.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/d2990d74448700f2e9f93ad95f174bf1/76915600525.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/86563460089.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/b5d3s65maukeqhmntsoicgjlh1/lunarilenijalewozoro.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/ragogulemapurelesed.pdfIn PDF document text
    • 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_off0000f195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF195 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A7 17696 bytes
SHA-256: 18024eb1072d57f8f465f86c0c33cbeff29520ed2b2551690221f6833ca90afc
font_02_sfnt_off00013868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13868 10460 bytes
SHA-256: 223bde793328e4633421aa26c9078c1ee768c330aa81fbccafceaf356eea7d90

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