Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbed8b6cd96f682f…

MALICIOUS

PDF

113.5 KB Created: 2021-07-23 06:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: c43589fd31bd9538adb10ad49eb49330 SHA-1: c944f0c3770efe4609d8e6671774af0150546d39 SHA-256: fbed8b6cd96f682fc58118469f4e2d527b121490669f0c0a8a9864bf30d8423a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Several heuristics point to the PDF acting as a link farm, directing users to compromised CMS uploads and disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and heuristic findings suggest it is designed to redirect users to malicious URLs, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/nogebunuja.pdf In PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a14d1fbd9---14348593865.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072301155546---94313379790.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/20514513070.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608815ab3dcd6---65250781013.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/7c7f4c4d4fa7ba6165225ec8a152bac6/76538555519.pdfIn PDF document text
    • http://elm3rad.com/file/57317402458.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/mafuz.pdfIn PDF document text
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/ranaradu.pdfIn PDF document text
    • http://thaide.org/userfiles/file/ritimesedevozitof.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/kolupupabatura.pdfIn PDF document text
    • https://comfort8889.com/upload/files/35829568149.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9c60a437c---jokekejufimozobakodifexe.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/e370515e53b9a8682b1342a6039215b9/31223656588.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/12743410248.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/lifovakikowuf.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/33c75ee64e0e89f2c8ae526bff73e2ce/xuvemoxigironivaser.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/d5f6bb39eba42d78885160a73b8d84ca/80573424625.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/xukonuvupizojepolibexotat.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/098ffca563bb923b7f6299732faf48e5/99412173729.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/27231551272.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/d3266c6eca69bfb76624458e0ef2dbf9/zesokonewetasupedibunako.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d4edb8e7c---98404818840.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/onj9v3dl1s4pi2fgmpiik7qnc4/81456797144.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/dajur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=red+social+periscopePDF 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_off00015cb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CB8 17308 bytes
SHA-256: 5a0924040bc9139fddb41a83371d6a847c65445c3635034d30ac4eb8c836b765
font_01_sfnt_off000189b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A1D0 10348 bytes
SHA-256: 5d577a2b3dca6dbf59057808c6ba271ba2522f4f9faf8f524c938092709bf7d3