Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2155d38ac425c1a…

MALICIOUS

PDF

81.3 KB Created: 2021-09-05 20:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a01c3d71e0442c239d459de2223192c8 SHA-1: f8234bf2abbbffd12a1ac2236dd9d40785577594 SHA-256: d2155d38ac425c1a4ae5180fa9ad8f0139acf9a8c8ebabd4e643feb9404d6a87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm pointing to potentially compromised websites. The PDF document body is heavily obfuscated, but the presence of numerous embedded URLs suggests an attempt to redirect the user to external resources. While no scripts were explicitly extracted, the nature of the link farm and the detection as a phishing trojan implies a malicious intent to lead users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/8047916.pdf In PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/38898825138.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/54830125263.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/cqn8dgu0r5vlqh3h0qqsd2ko6f/40807934054.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021073103440556.pdfIn PDF document text
    • http://tfforming.ru/d/files/67641195991.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6b5e5e71e---soxokaja.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/votowobuzizolenerikizivon.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/be99b69d7e081f5e9ab0853d7fdaf793/lolipavibarebe.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/31314737422.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/713f7eb358d14e37d399df5d422af4a1/7598055585.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/bolekugor.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072aafe3e09b---tukagurovefejex.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210520/file/18053739054.pdfIn PDF document text
    • https://maisonforville.be/documents/file/34231901078.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/26b0de7af84c15fc158f62f74ac917be/bixokubuvi.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/22456283639.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/42183275763.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c82b1832b---lilimunarotob.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050318565973499.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/5480632411.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/34281357590.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/36999852601.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=upsc+mains+physics+syllabus+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_off0000db59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB59 16860 bytes
SHA-256: 982f84f44bcc914f70c3863e764004eae344b0f6befbf671d602fd4eeddfd916
font_01_sfnt_off000106d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE9 10796 bytes
SHA-256: c9cac746b6781639f3134108b1357b52af917e2fd4bbff1424a4cb591ea9884c

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