Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba8509dae3bed79d…

MALICIOUS

PDF

80.4 KB Created: 2021-08-01 06:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 886fb9f4fc395a989cce441cfe3049b6 SHA-1: e4b3058a12c6e780cb06b11b70415f5c13816ddb SHA-256: ba8509dae3bed79d22a22a771f1bb32a1d4d5b2d6e8d243ab006318b3fcd23e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/b51f6ad038eca04fbcb79d84ea9f4966/lomidew.pdf In PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/fb5ae9dc591bc3b585fe9b688d5314e3/losovep.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/81428372483.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d415b94a4c---xorow.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/29463391674.pdfIn PDF document text
    • https://aspirans.com/files/file/badarixaxemogawe.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/maxerexirutilusujizipozal.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb5bde6ddf---nedakefurid.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210623114902.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/rebavamanafixuwas.pdfIn PDF document text
    • http://bakkervoorwinde.nl/app/webroot/files/ckeditor_files/files/fojaruzu.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/cb34d4f0eea0e6c71afbfb4630d9ab9d/zosalojidi.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/7d32935d33348f490b920d6c039594c2/kogazixisumizovopifa.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/dinotekokeliz.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/358f328acb07ded4fb0c32980c5ab78d/16255810396.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/letorotalukitid.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a559310dbb3---zonagakozapitomaro.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/wunavovowosov.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/fusake.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/6586998255ad3695133a8547759c5c78/68763559998.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/2tsc9ap19l5nu7vqfsf6tva6vb/58168891669.pdfIn PDF document text
    • http://kmsenior.org/file/files/xidisizen.pdfIn PDF document text
    • http://hilltopperalumni.com/clients/9/93/936f23dc4abb03f6d4a1aae2c8a32781/File/3801501540.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/422512e722e24fe65fcfbdaf63b4bd06/kivijuzetezujo.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/g7kiasppnm8vm9i29nm3cv6u13/53652164446.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=bridgerton+season+2+netflix+uk+release+datePDF 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_off0000d454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD454 16872 bytes
SHA-256: f3fd0b6a2cc129297fd1a2acc495a8937db16ee045118764c1e45ec115861a6f
font_01_sfnt_off000100f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F0 10996 bytes
SHA-256: cd92c288958776fb918b283bc47a04c7fa153c186e9964f0ddc704badea508d6
font_02_sfnt_off00011a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1