Malicious PDF — malware analysis report

Static analysis result for SHA-256 83f7a352a949ba0d…

MALICIOUS

PDF

86.6 KB Created: 2021-06-12 06:34:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 13fe5cc418edb4f45c91e42a6987c7ec SHA-1: 87f4656cf14ac7e12d510bff9ce9447db22a3e5d SHA-256: 83f7a352a949ba0d5503b07da4d0bb480fc12c0fdf04b794dbf25069e504527e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document exhibits characteristics of a phishing lure, indicated by its extensive use of link farms pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing pages or download further malicious content. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://irlanc.ru/uplcv?utm_term=chanakya+neeti+pdf+telugu PDF link annotation
    • http://blissworldbeauty.com/newerac2c/userfiles/file/31479443265.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160a28b7210cbf---zugobugakixotodubikapinir.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/u7e96svqa90l24gkofrvpk2420/sajubatipunosobutupo.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/25fe47d238572e910552a54d4c778380/zotefizilegakokawajex.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/sanufarapefowazik.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/bamokimir.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b0a50f8a7---jodesoniwalamuzelefiwepe.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/20517124347.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/fexeboboda.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/jtdp0cvd2t6dg8r8k2i80dnlm5/vutotazudo.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/papelofufilimebivifepepij.pdfIn PDF document text
    • http://leilehua76.com/clients/4/4d/4d80c013f15dbe3c797666a457780dca/File/772410979.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/didapugazezofasi.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/bc434ca4e6212895307ac2eb86d0a3ca/vexutibewezarulax.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/gv0ni8qbrn2r07sujo56nkn7cg/66058032381.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/eb8c8fbf0684721673c8d7e69155eeb4/5981065072.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/debiponeguzif.pdfIn PDF document text
    • http://sun-tes.ru/files/file/pisik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE95 5100 bytes
SHA-256: 8674e114d729ab299a9a4cfef761d8b23a59015e5c55be6bd94b099c30dfba48
font_01_sfnt_off0000fffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFD 1972 bytes
SHA-256: 3df3b82d720158195858d32b1f3a6a0c16f56b3cb0f2ecffe0b7198f22d883ea
font_02_sfnt_off000109d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D1 11060 bytes
SHA-256: 354befad10e93d7f9569f99da1d80de3191b2027a7acd9c9f0417ae7b724d198
font_03_sfnt_off00012f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1C 9416 bytes
SHA-256: 0442f1dd356ec3854bdff2affae27f4fa8c43509c098e9b3e6677f7b937cbb4f

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