Malicious PDF — malware analysis report

Static analysis result for SHA-256 c033196da722d07f…

MALICIOUS

PDF

73.5 KB Created: 2021-09-19 08:11:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 641dd0c9d5f5079cf5c18f17dc5c58a6 SHA-1: c79f151fbdfbffdf6451f8e7483d89179cd69467 SHA-256: c033196da722d07f172a2ef433b1103f70e196d8314e44219b50d99f8075dc2a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URI and compromised CMS upload links further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://allytemp.ru/uplcv?utm_term=mausam+old+movie+watch+online PDF link annotation
    • http://thegioixedap.net/upload/files/61586835993.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/wuvadezesubotokewi.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/0c7e2c4b13e2f97819a3f443961c27c0/zepidirevujeditekiwidis.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/91003693305.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/74755871190.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144bad8daad9---66110369634.pdfIn PDF document text
    • http://wdnederland.nl/file/53869572253.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1631361141.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/vupakutexunuwiwezedo.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/67902126166.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/46065921724.pdfIn PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/80506117659.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/19157562213.pdfIn PDF document text
    • http://panova-art.com/files/file/71024263993.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/qc2i0nlmfm7uibqms389jcc291/54320306071.pdfIn PDF document text
    • http://congtyvima.com/images/Download/bufeki.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/47613636262.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/vg8c2rkrm0vq65oq9mi1apfkvu/86027161110.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/sasomo.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/73104073286.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/karabiware.pdfIn PDF document text
    • https://stancijanegrin.com/userfiles/file/40795456814.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/zibapepegajav.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/88770892517.pdfIn PDF document text
    • https://farsiherbal.com/cache/fck_files/file/49912635931.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_off0000bba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBA8 10780 bytes
SHA-256: 0aea093e31d4a98e4dfd091a63eaa1a302e53c51f73a46ddba1749e88c52be8e
font_01_sfnt_off0000d45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6C 17092 bytes
SHA-256: 254e285ade35a74ba4e7baebbefabf9a327d542063bbf82c70aaa8a2db659de9