Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fa81dd883bf5115…

MALICIOUS

PDF

81.3 KB Created: 2021-09-11 12:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4503fbee4bd8e696b09392ca5243ae96 SHA-1: f163a5e973173e5f7c5904c4dd4592e77a8103d8 SHA-256: 0fa81dd883bf5115ebdcd7d449c9bd245e6634641a23c61f90a9606f182f6b51
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several pointing to compromised WordPress upload directories and other disposable hosting sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://gdwtechnology.com/fckeditor/file/jabamoxumujuruwedel.pdf In PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/nesenokikipunogokolovele.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/73009717835.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/86588631289.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/vosab.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/41743269348.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/xilapesanesikuv.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/fimox.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/39655401365.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/38516028842.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/37174890771.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613598c20eb78---44666950166.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/9e9b7ea4f7a9409ee2ca628a383ba27f/titemekavo.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/gevibegejego.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/24523916464.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/kolizejiwolurov.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/57838148218.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/lenifojin.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/36298058094.pdfIn PDF document text
    • http://xibuhuanyu.com/filespath/files/20210903040328.pdfIn PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/24165142974.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/kolalike.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/sorude.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/41422923573.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/kfnoitkd6krtvj48flk2o4rmk6/77124395998.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=bhim+dance+plusPDF 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_off0000d8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E3 17864 bytes
SHA-256: 1bc487f6d0dbff7499daea0dbad319b5773466d2edb881e38edb2799d74a7fdc
font_01_sfnt_off0001076c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076C 10612 bytes
SHA-256: 1eded608ff84b033c71ca0e3292590562b7b1b7142ddcf68789c9f6ebb861eeb
font_02_sfnt_off00011f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1