Malicious PDF — malware analysis report

Static analysis result for SHA-256 c33083a7bb56da53…

MALICIOUS

PDF

89.9 KB Created: 2021-08-24 06:29:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f1dc4976112b0c40c95a471e7624e19b SHA-1: 9f06971ee97b364d37ef5ef77b64309f0dbaaed4 SHA-256: c33083a7bb56da5317f2cb4211efa17ec098f179cd05c398c2006fdfd7e3f8b6
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. Heuristics indicate the PDF acts as a link farm, directing users to compromised websites and potentially disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=best+cars+with+automatic+transmission PDF link annotation
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16070994d0eece---pipik.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/kizitevorinoli.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16070daacaedf4---54096927886.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/jidemomibev.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/ed8b6f3555b010988b60b9e8466ba0b4/17595873092.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/livolefezolotadaxeni.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/wujiroxifafemegirixegone.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/uq6v85hekv8uc3496repost1d7/39980953223.pdfIn PDF document text
    • https://mkart.it/uploads/file/kigimalalikewososim.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/virizoduvepukewulegaz.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/08/08/file/93969283762.pdfIn PDF document text
    • https://silga.ca/userfiles/file/roniniluzoramasamo.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/575009e889ee9412fb5f6a2281ee27ff/92133505285.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/78108185122.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/96217313810.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/52a546aa314b1b387e50ee67adbc1680/25308201571.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b82e5e64716---12354471387.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/64182544950.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/9ca3637fb254b7de51c34fbbfe53a2c9/36046827681.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/24181394014.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c52f4fcd7---8053182932.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856ae4da6d9---62996915303.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/8j1uec2e1qo33rmig65rt7ji82/37295917141.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/3981380433.pdfIn PDF document text
    • http://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/kosopanopibodutonatomiri.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_off0000fdbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D5 10688 bytes
SHA-256: 9259d49e3cacc6e36790bb135c35cc40bf8d9ddf8a4d25d7da9ba1b61e79ca7a
font_02_sfnt_off00012e45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E45 16136 bytes
SHA-256: df904eb2810b09561aa1dcc70d4d9b60dcc6d284c4fb1b23594b1fdda65c5755

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