Malicious PDF — malware analysis report

Static analysis result for SHA-256 36ded59748be4032…

MALICIOUS

PDF

86.1 KB Created: 2021-09-15 17:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d7da8970603e05174c141fcfa9537f14 SHA-1: d23a59352206839dd09d69dcfd5dc230c645d953 SHA-256: 36ded59748be4032e6b7e2f422815184af92bd6d0ede7442690bd3b5732e237f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the primary attack pattern involves directing users to external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ketchas.ru/uplcv?utm_term=best+video+morphing+app+for+android PDF link annotation
    • https://projekt-lesen.de/userfiles/file/kiranizaranofa.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/89203292737.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fixulusafiz.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/poseturototuvik.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/58cbe1e5747a842364f5d03d094613aa/8325762427.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/fojezurixew.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/6d6b92441919f754edc47f299b2f42f0/ruxafanu.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/11672fda7919db190bf6634fe65aaabc/nojapebudupabidirotebajor.pdfIn PDF document text
    • http://hadt.vn/upload/files/gipado.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/43617113366.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/gevanojuta.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/fexixarukenede.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/koruliwizimafakifiletu.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/90420066604.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/lf485bf3a7qjd7354els2la864/kazaladeregeritedonavadi.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/41743704819.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/nixeromonozebetogumop.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/vomuzexenekor.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/bedonijawibojamifo.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8fe542163---2268544119.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e12996f6b5---43230025931.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/notiloxulu.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_off0000ec94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A6 17332 bytes
SHA-256: dcab6cc8a0fa8011269cb50a200fef0b4a3e09a3e9aa6045887ef641260f46ae
font_02_sfnt_off00013196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13196 11020 bytes
SHA-256: 5f8d5376e2b5390672ecf4cb481887301738f46e234b746b4c4d681381e033c4

Open this report in the interactive analyzer, or submit your own file for analysis.