Malicious PDF — malware analysis report

Static analysis result for SHA-256 439cf20ef4ebdfe8…

MALICIOUS

PDF

71.9 KB Created: 2021-09-06 01:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7800d76d22436965e33d25ca412aeccf SHA-1: e145f9b51290f2f877b8f2fd915f74d5f2b9432f SHA-256: 439cf20ef4ebdfe8de7b5be8e7cea43bf043c33990949c86f30827455de52f4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised or disposable hosting domains, likely intended to lure users into downloading further malicious content or visiting phishing sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://eltonltd.ru/sites/default/files/uploads/vamoxorozodesuxotajo.pdf In PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/rufenafixedige.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0240b99785---9438894993.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/1e925ab295939c6b565cedb97fc352c5/18020215424.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/46730166354.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/kerupitolubiri.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/jubipamefubavufe.pdfIn PDF document text
    • http://cuatudongsaigon.net/uploads/files/48497254277.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/26687815411.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/rtainbq8ooclkd60p8m4bnqb9k/tuwutawagijej.pdfIn PDF document text
    • http://bean2beenefamilytree.com/clients/60578/File/zafutikolujalen.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/nifatozu.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608031484181e---delab.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/ranutavexasasa.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/59335744109.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/92590654159.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/vr058tcodbjg6pjl59drh7rj66/28764130745.pdfIn PDF document text
    • http://websurin.net/UserFiles/File/sixadudu.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079759d85e45---13129299528.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/6u90ssb7kq0792j42rppvaonj2/xikufixejukuluwapa.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76481677816.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=embedded+systems+rajkamal+second+edition+pdfPDF 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_off0000b4e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E5 11240 bytes
SHA-256: b197486d4d0489fdff7463a756a667076e1597c7caf23ec3d734b7f16a9de796
font_01_sfnt_off0000cf05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE717 16364 bytes
SHA-256: 46503cc34098a6883ad37a1659398084a210243fd187e45d199cd4bfb62a8688

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