Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd5c9d9bad832266…

MALICIOUS

PDF

106.7 KB Created: 2021-07-01 13:41:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7c8f604265a1eefdfd4546d4be2096fe SHA-1: 49705a833475c8cf3775f6bf8d8310c781f51364 SHA-256: cd5c9d9bad8322660f2e217b7db65b4c22f63c2a0c90894c71647f6333363e21
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution intent. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign, potentially using spearphishing attachments as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9867

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://pistant.ru/uplcv?utm_term=trials+and+travails PDF link annotation
    • https://noddy.nu/images/file/32195678098.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160840c32571d0---41329419891.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e3cd5bd00---46155163055.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1850f061b---84755301466.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/mamumaxatarunorazi.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/67402806937.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/vubaburugoz.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609fec1db0340---96307284418.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/c4193b0a43d1e9e24f00988da2a6a723/8865721453.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/vixitafujeg.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/sadutozugubuxe.pdfIn PDF document text
    • http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/vepugizomofogatigodeji.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/6f3e5463d4b1b4f0a98c935334d84997/77515663604.pdfIn PDF document text
    • https://airshow-bg.com/file/54833303311.pdfIn PDF document text
    • http://sweetbasketsbyjackie.com/clients/864293/File/lutunavadunodi.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/pikakam.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///83288322293.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/fapozul.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210628_6DB897FB0B869215.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b702f8ee83f---2318019874.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/nitixalinefuvik.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5ff3cc61c32dfffabe362e28b824df8c/76392961424.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/42470076651.pdfIn PDF document text
    • http://tchsgradnite.com/clients/5/57/571263abd544e5253d6fa656c7d1828a/File/vojexo.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/6cc3768b0341c1bb95d3f16dc763e0b2/24423962388.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001202a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202A 18820 bytes
SHA-256: ad626feb28f61aa63b87d2faf51d0bef87a1576147a340e5b7b6bc3a6c9bdc8a
font_01_sfnt_off00013e46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E46 10020 bytes
SHA-256: 6905038b96a4b9d1ee908cebb6d8ea59fe1ddefe0ba0120b9acb8d687529b74e
font_02_sfnt_off0001548f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1548F 18172 bytes
SHA-256: f7b641b37701c8a8b1ddb1e350cb0a65ed2f91bb9aa0fe1462a88f31505321e0
font_03_sfnt_off00018374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18374 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.