Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c7cfbf377ee8e7d…

MALICIOUS

PDF

83.8 KB Created: 2021-09-02 07:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: fab57578a83ca0ac94d1481649752b5b SHA-1: adc092212727c59d2cc3caee86b57cfdb62307b2 SHA-256: 0c7cfbf377ee8e7da98836d29410c24a7db07be22d935b84f6cbc1de44bd92db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting an attempt to lure users to malicious content or exploit vulnerabilities. The document body is heavily obfuscated and unreadable, providing no direct clues about its specific purpose beyond being a container for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://tecnicadovolante.com/images/file/40384150710.pdf In PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/55023721186.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776c15a7da4---42550871512.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/besenobezusalesa.pdfIn PDF document text
    • http://klefmarken.se/upload/file/baxokigedumexuzomumufizu.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/29446711455.pdfIn PDF document text
    • http://dothi.info/images/files/56466443876.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/gokiwemozizana.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4634115b5---26628842344.pdfIn PDF document text
    • http://www.umadai.com/ckfinder/userfiles/files/fobewitoxodulunulirigutif.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/kefisezutalofus.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/3497867942.pdfIn PDF document text
    • http://dsm-trhs68.com/clients/8/81/818e764d3414495a915a5f66638dc9bf/File/lulonow.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/revozeduvokonorebonegikan.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c40d4727fcc---60467871686.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/41074649346.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a9de60c6e24---67095625823.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/3d48a373b9f1875d4eeea9195bea60c6/22155678550.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/95848047056.pdfIn PDF document text
    • https://adikkeempat.com/contents//files/64431444667.pdfIn PDF document text
    • https://hifi-markt.eu/kunden/kronhardt/ckfinder/userfiles/files/93936150232.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/6b21c175b0dd09bc2aad9ce12de7db22/16810441428.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/73512872855.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/1bk9rr83bdnso2139oe061e7jn/80766403851.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607539742031a---fagoder.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=shake+it+baby+songPDF 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_off0000deda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EC 19412 bytes
SHA-256: 413efab0096206d901b8ec09a5427a5a0e33a1199b73c44f04e2132cff696cd3
font_02_sfnt_off0001290e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290E 10660 bytes
SHA-256: 61cbc77ea76a8d47413945c3bfdbe75f1263c3878dcc8c15ade0562470fb6281