Malicious PDF — malware analysis report

Static analysis result for SHA-256 6971500f58fb5f04…

MALICIOUS

PDF

86.9 KB Created: 2021-09-01 02:25:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8f097ae82ad5d260779dc1318df5d8c4 SHA-1: 6ab02444f1086adc095c65608a33cfe88751baa3 SHA-256: 6971500f58fb5f04dd64948616e7a5a179826c8d9c09255ed040098925326f7d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous external URIs pointing to various websites, many of which appear to be compromised CMS uploads. The primary purpose seems to be redirecting users to potentially malicious content or for SEO manipulation.

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 https://catamma.ru/uplcv?utm_term=qualifications+needed+to+be+a+microbiologist PDF link annotation
    • http://lnimeina.it/userfiles/files/94296536751.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3d5d741ca---folididurojawoliditulekot.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/60945295308.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1629717811.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/d002a5dc0f51e0e2362e0f42dcde89d1/wexepawoma.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/s2do3vjl4hcaigg4c6ndob9po3/gijomiturivujifikamazuseb.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16094440824851---benagozilexav.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/37976712245.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/laxaputusinutaro.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/dd42a9i4prpkqsne6mkevp7t00/favalu.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/mopenenuzemuzolemulokezar.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6e1560d93---mafawedowuweguzisozu.pdfIn PDF document text
    • https://5udua.com/contents//files/jitorakuwupuzigutojanapo.pdfIn PDF document text
    • https://www.dgaspcsm.ro/ckfinder/userfiles/files/botati.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/27590821300.pdfIn PDF document text
    • http://findusafranchise.com/files/files/4543717379.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/44225291422.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/gulalomuja.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/rejot.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/30419741801.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/kuwexodivu.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/15bba59a9f5058e78c16bdd0f83e75cd/42817111405.pdfIn PDF document text
    • http://medrea.ru/upload/files/xigegemebaz.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_off0000f0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B6 11116 bytes
SHA-256: 5db68b309ab4d01e441d06d23f59d0f4cc02b6e412f987cbf08cf47487f67608
font_01_sfnt_off00010a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A77 16712 bytes
SHA-256: bda93acf0c46a36faec8a2bb9e7c1e0e20aa4c1d2d31395176baac3d5a8d3bad
font_02_sfnt_off000135a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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