Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b44cf78e55ba09b…

MALICIOUS

PDF

81.6 KB Created: 2021-09-10 07:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7b2dd3c1024060aa7c055cd613287968 SHA-1: 78c93cdb16d67a1af9485e6483fde84327326612 SHA-256: 9b44cf78e55ba09bddf4f1caf4afb6edc0f461ebbece6ae18b33352a90e5c83a
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to potentially compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://douzonebnf.com/upload/file///3059644304.pdf In PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16130c8f2ed65c---2926130596.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/gozawuwumezole.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/jonakosedewokegi.pdfIn PDF document text
    • https://rm-parketi.si/uploads/39888153469.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/83038005960.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/40761742110.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/4034131168.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/72031320726.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/nagovejabowokopid.pdfIn PDF document text
    • https://brod-plovdiv.com/images/xuxavenasonosoj.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/xotenajedorogilonagiduto.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/59291748590.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/vuvonan.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/puvopolixunexukawe.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/1ecej00bubdflog0bqktqan9gk/83639327830.pdfIn PDF document text
    • https://eclearusa.com/images/file/79770203481.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd568d4bdc---12589709156.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/25105783201.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/nilaveluwud.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613979eaf046b---zilipadobevopilozi.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/zakesikobibugimuvesomofu.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/89859727568.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/biwubedar.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/43965532824.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=jumanji+in+tamil+full+moviePDF link annotation
    • http://irodori.kir.jp/files/file/zovulijimufigavegebuxefaf.pdfIn PDF document text
    • 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_off0000d8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D2 10392 bytes
SHA-256: 184203ca6a10c458a0679d595353d0dc7c1cd4770ecd3c0df897592064dc6a96
font_01_sfnt_off0000f052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF052 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10864 19112 bytes
SHA-256: 4b0917f23a2725db11e917d60490d40866140b3a79a69c28f2c00d49e32d50fa