Malicious PDF — malware analysis report

Static analysis result for SHA-256 133a306834d21429…

MALICIOUS

PDF

81.9 KB Created: 2021-09-16 11:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1265218e9746cc67d22498f7fe2d7cdb SHA-1: f6b62478e4be179920b8c3084d226bb07152375c SHA-256: 133a306834d214299c56539401e6fb1514803f6db1bcae79cb65c2eec703bc8d
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a deliberate effort to direct users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://mytalk7.com/_UploadFile/Images/file/govut.pdf In PDF document text
    • http://lycee-elm.com/userfiles/file/wemetevutogu.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/97395289473.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/dca40805b2098c3cb4228ea34ede66cb/nakajuxovegit.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/77529700950.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/46128190231.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210908_6405442D87FB83DB.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/buwigavudu.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/firimuxep.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/31109317372.pdfIn PDF document text
    • http://allycatering.com/userfiles/xumabaxubolosasi.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/26087417736.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/cac607e51dbdd8e8e9a152825a038a50/daxezirogiwanobubub.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/19994734304.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/sagad.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/55822511596.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/vupodulilofavurevogolav.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0d7156da5---daxupafenevij.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5e9149ca7---19767425613.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/32300706785.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffb219d70f---fuvus.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/32411195567.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=transformers+age+of+extinction+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_off0000d08c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08C 10936 bytes
SHA-256: 95cadbacd5236967b7adf03f27a72a25421febea9a8e260c5f0b40a11048c644
font_01_sfnt_off0000e9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F2 21636 bytes
SHA-256: aa644a4ed77d4db463775197c63c63dea92d594e76b6d99fd32071265c0296e9
font_02_sfnt_off000121eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1