Malicious PDF — malware analysis report

Static analysis result for SHA-256 588fb82089822b5e…

MALICIOUS

PDF

89.7 KB Created: 2021-07-07 17:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 293901630fab4d9b139025eda48296cd SHA-1: fc2dc5c4556047b18471c8dbed11ac37931f6351 SHA-256: 588fb82089822b5e8314edd8f32cd9e215f7d7a6ff43dad717cb8d875122b208
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised CMS upload directories, suggesting it functions as a link farm to distribute further malicious content. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/4990oqd3i86lmqdk0ctrn5dqdr/bupusaf.pdf In PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/jikupagopug.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/2803156af60bf4d2c50bed9298ef6015/84468733290.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a69e40963---80467305522.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ceb9d7b99c---dusal.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/37750992176.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac037d05be2---zuwovalarukarexoxivizozi.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982f00ac360---31562515412.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073c33151401---68626859962.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/9b6891eb8c45699c3d927361ebf432e1/670345277.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/629854e742f262e2edfafa4101d0e3ff/xedaja.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609980a09010c.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/46187551421.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/2e126994c99291c592f7b0c854eab516/91532038430.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/kevabanoxopabasazukex.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/rifevalowiboketekegez.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/35008255638.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/18d4b3078aea6e3ed2ab5886b7832a09/31349250330.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/46300864608.pdfIn PDF document text
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/36b2b50f1689cfef069bca1f54521931/dadanomujisareguzobav.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/96d7073385489248ba8ab60ab2e38679/28735769906.pdfIn PDF document text
    • http://myexamadvisor.com/fck_uploads/files/28978769431.pdfIn PDF document text
    • http://marymo.ru/uploads/files/91396293062.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=if+you+have+an+underbite+do+you+need+bracesPDF 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_off0000fc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC00 16836 bytes
SHA-256: 87a31d6df32650cc2335fc70c35cabc3cd5eb0f5a520f2866e007e2d247c7c15
font_01_sfnt_off000127f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001400b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1400B 10896 bytes
SHA-256: b97c554030e1f42e79dce06b7b7e432c9d175d7d01f12c1b108da79d922d211b

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