Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f3337c88a047112…

MALICIOUS

PDF

89.4 KB Created: 2021-08-09 23:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 795539a28fcd506d39a221d743b4c299 SHA-1: 1f245524337aecd2e5f2181f5def994519d5bfc2 SHA-256: 9f3337c88a047112f9e3d7aa960f3eacd8ec6d739b289a8313d592a13d91e4d2
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to facilitate redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://alt-1c.ru/userfiles/file/bixaboputinurisegufopeza.pdf In PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/17346649727.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608654c6c8405---suleziwabiwikeguxolarojeg.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/juzepepoxogapad.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/jezorofogiwijofi.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/27185439537.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/45700160379.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa6a9925629---81049785203.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f63b3c8ee---38836255410.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606eda47a7552---76716138524.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/sukivixebazijavelama.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/senedutomapenabukowag.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-7-7/20210707081402220808.pdfIn PDF document text
    • http://topas.lt/userfiles/file/19840351124.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/0ad4431f9d14b5f47834dc3ef9704b90/zesapofesaribexewagid.pdfIn PDF document text
    • http://hollandunitedreunion.com/clients/5/52/52f3fdf721cdccceb566e47094f1d9de/File/monofila.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/tokon.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/af8193f6368a1f2bd46e0d84352c0567/86205383015.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/81413539420.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909473b9ec0---kowamewumumikasazefumu.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/20df20d61ce2804eabe3d5b4e15d3e9a/59719737668.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160902872294f0---rigawozijug.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/lapefewipifawatiza.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/sepadavodisuzezobefunukis.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/zevaduxor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=como+instalar+sketchup+2015+con+crackPDF 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_off0000f4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDC 11292 bytes
SHA-256: c641988bd861364a4d51e4d586ac5d27be7bcc4e65c02f836ca973c2761b0e36
font_02_sfnt_off00012752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12752 18016 bytes
SHA-256: 7a7acfca37ef02501b570b30629ce67b7195594537f9a93a0c48bf6eff99bd3c

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