Malicious PDF — malware analysis report

Static analysis result for SHA-256 35d89e43fe0e1440…

MALICIOUS

PDF

88.4 KB Created: 2021-09-06 03:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 91b4ff11e4ce751219cd6fb92fcde9ec SHA-1: bfa1dfad7982af7452779c9fc141feab02c0304e SHA-256: 35d89e43fe0e144036ae22f6af5a9d7db85ac5bd1f2bfea3adc2bc2fb072e47b
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised or disposable hosting. The document body is unreadable binary data, suggesting it's not intended for direct user interaction but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://wine-paraphernalia.com/files/winep/_repo/file/8275643677.pdf In PDF document text
    • https://daismene.it/file/beneweminamaru.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/fesukinorumuxeruk.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/dakubebibudibedu.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f494e823ef---69388048590.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/jalolotedelawere.pdfIn PDF document text
    • http://oakgroveschoolheritage.com/clients/b/bc/bc5c94904a1f00f1300372e6f875146f/File/kimodol.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/gefijumemu.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/0mag18jp41sgn4slhmarhoa0rq/wotum.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d815307db---pudojuponozimaz.pdfIn PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/wuvawetufos.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/zizujoxev.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/64955627858.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/ffeca0f6d6a63f4b7c6c35de02b30127/24069311444.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/zolerawoletuwa.pdfIn PDF document text
    • https://webmenuplus.com/images/file/puwedokafapawodi.pdfIn PDF document text
    • http://mebco.ru/images/file/79705606238.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/57972853733.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/3128556716.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/abm30apbjqlh15ltssq17vtdf4/53267402892.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/josasinoni.pdfIn PDF document text
    • https://matteagianotti.ch/userfiles/files/90999592275.pdfIn PDF document text
    • http://thongthien.vn/upload/files/69960593437.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=vaporesso+luxe+manual+espa%C3%B1olPDF 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_off0000ebdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDC 20768 bytes
SHA-256: bb6758026009b9491da5a9676a8794729d9b9f6a58e57f420fc0cdb61036c9af
font_01_sfnt_off00012219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12219 10600 bytes
SHA-256: 9687bc5fcc59d7fb0a44dd3b51a23e563541a041cecef0365107861e1e979df7
font_02_sfnt_off00013a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1