Malicious PDF — malware analysis report

Static analysis result for SHA-256 46742f5c967cd32d…

MALICIOUS

PDF

80.2 KB Created: 2021-09-11 22:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9f652485dfc861b9c1f50e1f87040f19 SHA-1: 84a284d9edeed753eff0f8516e2621b290e66f3d SHA-256: 46742f5c967cd32d57f4fcb2a7c9d1dea9feeb30befebbf27c4fe72b11d5caeb
156 Risk Score

Malware Insights

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

The PDF contains a link farm with multiple URLs hosted on potentially compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of numerous external links and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic point towards an attack pattern designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cmf8.ir/data/file/bunevixupidekixuwitasor.pdf In PDF document text
    • http://ehoron21.mn/uploads/files/kudulapuluw.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ae28c83d1---bagunosibos.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/waseguzeraweji.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/gaves.pdfIn PDF document text
    • http://kleinschaden-expert.com/userfiles/file/24781845257.pdfIn PDF document text
    • http://inercial.es/uploads/files/kusabaleradomixexo.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/gaxukagedurubemiluza.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021091021461832.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/45226548940.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/1302aa0096c20dffdafa459b09dca1bc/20428963085.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/buxepatad.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109061642186845.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/gofofobid.pdfIn PDF document text
    • http://islenapuntos.com/campannas/file/xugixusesilitatixilugi.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/tesumomo.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/gagetifodizubejodavediji.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/72041074122.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/botevunekirenolewatukizog.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/98579887140.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/gefagegewukulivapaxup.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a41c68413---87436782113.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/lunajutizimuzojosirotam.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/5629310207.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=harvest+moon+more+friends+of+mineral+town+cheatsPDF 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_off0000d5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F7 16988 bytes
SHA-256: 3a1b82db4d951256d5277484784bf7afb6a2dd76208c523a9db7e5f05e9a85b5
font_01_sfnt_off00010186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10186 10884 bytes
SHA-256: 7cf51137c239852fd7f3a5d761f82e1b69885ef8ed33780b400cd9742c18084f
font_02_sfnt_off00011a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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