Malicious PDF — malware analysis report

Static analysis result for SHA-256 0295a4abf9cdef2a…

MALICIOUS

PDF

77.6 KB Created: 2021-08-30 07:03:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d625716619210d5419d7407d85fc181d SHA-1: 513c1c28e793700cc667f3b9375413d8cec3305a SHA-256: 0295a4abf9cdef2a05623077e833341de25476b195d8577e19127e1e9bd95bbc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics as a link farm hosted on compromised CMS uploads and disposable domains, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly support its malicious nature. The document body is heavily obfuscated and unreadable, but the presence of numerous unknown URLs points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a36d537a4.pdf In PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/gikulikiziferulozag.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a94feee804---gibesedajanojinagabaz.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/raroxog.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701717e3e99---morebonafavowovavif.pdfIn PDF document text
    • http://hidra.it/ckfinder/userfiles/files/satimupumarotujike.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/glg8jbqfv6s46cjq8stb93cd20/vosovewufesalu.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5fd65e4305---69366867723.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/dakaxasobikegume.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3aceab548---radazexizerufazisipa.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef8f061467---53579559636.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3cfa44f73---259898206.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/8cff506e931ff2266cc86a391391a9e9/naferulosifososodizerus.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/10058930899.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/woluzoxewajugosutujogaw.pdfIn PDF document text
    • http://arablift.net/userfiles/file/sasigalijovupeteteju.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/n24jp8sj92sbugfdtsuvm0aj8e/kekasiredubekoxuge.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/38edae8afffb80e933513c2d456c5a84/60477650991.pdfIn PDF document text
    • https://brickbodysupplements.com/newerac2c/userfiles/file/38299251644.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/28fb9e5a6c5826a3022f4440300636f4/fafelisexedifigobu.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d515fa79b8---46489166147.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/37945131101.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/16495774758.pdfIn PDF document text
    • http://utopiasacramento.org/clients/0/07/071cdeedc048305be324eb10ab8031d4/File/85197118811.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/xanusipepe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=amos+fortune+free+man+study+guidePDF 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_off0000ce4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4D 15960 bytes
SHA-256: 979fba8bb3865d16fde80e5aa4e5b0e6dbe99165e629d91fdfb4b3e9b56a6317
font_01_sfnt_off0000f760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF760 10844 bytes
SHA-256: efc51e15828a8de5d87f47131530d9123e5e8f782940aebe8720b14101516c29
font_02_sfnt_off00011043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11043 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1