Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ebbcb53ec75bcc7…

MALICIOUS

PDF

97.4 KB Created: 2021-09-02 17:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 7dbbcadd293ec9c39fe5d6f82fb9a02f SHA-1: 6b4951d634f8a2e6e21a973d3fc46d560f18567b SHA-256: 3ebbcb53ec75bcc7fef5344f5807730d668e69dff957b059eea8eec39baa153a
156 Risk Score

Malware Insights

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

The PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's designed to lead users to malicious content or phishing sites. The document body is heavily obfuscated and unreadable, providing no direct clues about its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a28c69a0---35837787640.pdf In PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/vuzimaro.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/98af5a9b836afdab9c11fcb636d62881/7960019789.pdfIn PDF document text
    • https://777mto.org/contents//files/10095188232.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/18464385862.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/4b2da6df729bf1c62a03a78394fe4919/vexenofip.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210624_057F93ACE2D2DD5B.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/71342734706.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7538822c1c---kamagotuzukolepi.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/7792297755.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/e7969b13910640aa5f84387d3e16e9ba/36492887545.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7ba042f98---minoxowuda.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa967a886ac---62085632503.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/wojalabufimun.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/36450070881.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/lunulizuxaxuzom.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097f09871f1b---zowab.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/vuxomatujen.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/947c78b650b7e0c2973d69591038fd24/sewiroxewedomolilekanar.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/92542893212.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/85018220676.pdfIn PDF document text
    • http://redactron.com/userfiles/file/kotojovobenarob.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/sogewurabomu.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/6dc4234b91463bb085994d8fd1714d98/ratej.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/dumotinika.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=jarrod+radnich+game+of+thrones+sheet+music+pdfPDF 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_off00011319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11319 11112 bytes
SHA-256: aea8bc84f59a152830b6811492b17d6f18b704761b82f498c5fc8c5e736ad8d9
font_01_sfnt_off00012ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA7 19312 bytes
SHA-256: 1dc09985f886ab6887dd697a1ba6da4604808189d57cd21e92637576c9f66ac3
font_02_sfnt_off00015eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15ECA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1