Malicious PDF — malware analysis report

Static analysis result for SHA-256 98064172055bc23d…

MALICIOUS

PDF

80.4 KB Created: 2021-09-01 04:11:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f9ba844391243eb6dfdaf14adc55927f SHA-1: 0c6d261adf56d12036083af1f6eb7cab33082aea SHA-256: 98064172055bc23dce0232952f7b968a3693d04b37dedc9a44ed4c5fd1731ea1
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised CMS uploads, indicating it functions as a link farm. The embedded JavaScript stream and ML classifier further support its malicious nature, likely serving as a lure for phishing or malware delivery. The ClamAV detection as 'Pdf.Phishing.Trojan' confirms its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7231

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://krisoc.ru/uplcv?utm_term=chord+piano+the+scientist PDF link annotation
    • http://101balkon.ru/upload/files/23306814915.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/bedadi.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/dgg9dpjl6qkjkeiqcuihdo3usr/42022018529.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/2137177759.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/kumutajekaxezazavufiz.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/40224694628.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d430080765---lobopun.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6874fa51e0---85050066225.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/58057025736.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/jipezaponoje.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/91086472877.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/mubimulusivijiwapegopuz.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607195703c9c2---bikusor.pdfIn PDF document text
    • https://www.algeos.com/js/ckfinder/userfiles/files/zesurolo.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/f62a9c926bd5c015329a1ac0f5d2ac46/12728600574.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/tunadipikamiwor.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/34e236037947a89140f8a311a0241e0f/labusudu.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/9c3ea7d47fd249256fe7890018baf42c/30020864117.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d36e2c997b6---89157787852.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/78348055904.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/f55cd4818a1e151a68ad220c91e51bf2/70720866471.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607455ff15bd8---4528747399.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160be7b06366c0---62382425773.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bb68e5ec7---44065190795.pdfIn PDF document text
    • http://easy-sleep24.de/shop/images/editorfiles/file/fuzodadejonuremigamodexi.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/lawovikakutubu.pdfIn PDF document text
    • http://dlikefulproductions.com/clients/875850/File/30866799679.pdfIn PDF document text
    • http://ridendo.cz/files/file/25000534419.pdfIn 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_off0000e349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE349 10596 bytes
SHA-256: c111442ef9725293930bb126d3fee6a70c414b548f654cc525e325ff0175e5f0
font_01_sfnt_off0000fb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB76 18300 bytes
SHA-256: b28642e529a2bd6cd60817263635e21e44ce0058bc600d1cdf1d12917c3e0552
font_02_sfnt_off00012b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1