Malicious PDF — malware analysis report

Static analysis result for SHA-256 e71e75df9fa92d6c…

MALICIOUS

PDF

70.4 KB Created: 2021-09-29 10:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 9492fb613152d36d1fee2f8ddd0c5c88 SHA-1: 4eada10a224c168ec2b2e9cc786eaa9f02fface7 SHA-256: e71e75df9fa92d6cd0148b0130dc001a8aa5dfc2c0e331c338d8c194fc1bd26f
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised websites, including one hosted on a compromised WordPress upload directory. The presence of numerous unknown URLs suggests a broad attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://binarbaidrealestate.com/public_html/userfiles/file/rotituvi.pdf In PDF document text
    • http://asude.istanbul/ck_images/files/6970205105.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/22885669965.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1615185da960eb---71133632646.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d5c3a626f---38955181041.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613155bf82a7c---37735271545.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614aee85ed2e0---25632181290.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/fifumijujovikijojaxol.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/wakaxajejakus.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/sepobafokil.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/4p3fhit0u9bavhmg4krluh402d/54604677544.pdfIn PDF document text
    • https://e-room.co/userfiles/file/gobanimoviridadiju.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/88544642917.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/81597400761.pdfIn PDF document text
    • https://12shio4.com/contents/files/82707047572.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/17351230495.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/fixejenufimikanu.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/91296872930.pdfIn PDF document text
    • http://www.seminariomenorvalencia.com/admin/lib/ckfinder/userfiles/files/42709908826.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/73978538688.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/85078655107.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/75380046805.pdfIn PDF document text
    • https://gift2goa.com/ckfinder/userfiles/files/73632445587.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/3567070013.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=flutter+building+apkPDF 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_off0000b307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB307 15588 bytes
SHA-256: fb289655717a3cfb7c5fb01fd3fcf81ab5465e9dc27d28d8cc7ee7d63b4b228a
font_01_sfnt_off0000daa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA9 10588 bytes
SHA-256: cfdf4165795f9c529670416656e0fe1cc4eed24bf44c1076f585b07fd383e359
font_02_sfnt_off0000f26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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