Malicious PDF — malware analysis report

Static analysis result for SHA-256 1940455c36b1e091…

MALICIOUS

PDF

81.2 KB Created: 2021-09-15 05:24:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 36c2ba3b4962e28ebd39b33889b69f47 SHA-1: 793f56c23f881eeffdcbcff77e2e12102f3d4e68 SHA-256: 1940455c36b1e091a5966240b1c658ca6fafacc99c08a893935af6aa15eed05c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for Pdf.Phishing.Trojan. The numerous embedded URLs and link farm indicators suggest the document's primary purpose is to redirect users to compromised websites or phishing pages. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://medvor.ru/uplcv?utm_term=how+to+pull+up+deleted+messages+on+android PDF link annotation
    • https://zlato-stribro-investice.com/upload/files/tisifizosogutuseperebe.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1614135e58c98f---30275804315.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/47796404352.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/c265dd1dd0b1c66c4e0b8165582db92a/puditijaxukilikowad.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/ad5b30ec2b1d947b94cccaad0c22976d/92902393158.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/97637150128.pdfIn PDF document text
    • http://sb-78.ru/files/file/16512361174.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/makumevijal.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/38708516527.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/39378808809.pdfIn PDF document text
    • http://edilcfcostruzioni.com/userfiles/files/rejefidatobinigonuget.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/voxafogemetiwefurepaniwab.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/02844e3322bdd57e182f3cc0290f521c/potarulewokawejofizemiru.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/35947705143.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/vaxifuwamatezoxonowubu.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/kotegirulegoloja.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/20d0fce62ae4920cbe6a69a41a809b27/24895716717.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/94704072745.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/8b07d4c5dd1303506be0e76e6eb646ff/12323348520.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/jonazepoxovibedad.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/88670dbee380cd5a30ab0cb1997e5abe/fopekajuzigovumuf.pdfIn PDF document text
    • http://2222.netsociality.com/upload/files/68837301307.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411474523a0---14303331521.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ba2644f57---89173713115.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/72520179542.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/26776465754.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_off0000d6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eefa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFA 10912 bytes
SHA-256: 48a1b91995719690ee24c905e45d29b5f7b362acd7498324605a5ed8144afe50
font_02_sfnt_off00010801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10801 17776 bytes
SHA-256: 8a98d949ca2b5b41ce2d06ca19e649a44e12b2a36dbe4d3b9fecd28112007854