Malicious PDF — malware analysis report

Static analysis result for SHA-256 7790abbf59ff5230…

MALICIOUS

PDF

84.8 KB Created: 2021-09-01 16:10:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2a1e75f11decc0e7877441104ec4c4a8 SHA-1: dc0945e6c3c0d741bb5200c5ceea082e9fff7ead SHA-256: 7790abbf59ff5230527899a4fe0ef520b065867c5170ef38106eaadf3076be5c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. Several heuristics point to the document functioning as a link farm, directing users to potentially compromised or disposable hosting sites. The presence of numerous unknown URLs further supports the assessment that this document is designed to redirect users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://bielle-srl.com/userfiles/files/mivukofijaziwenemolurobil.pdf In PDF document text
    • https://humicdp.com/uploads/2021-08-17/images/files/77752397386.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755f24a8a71---196195555.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/lewubosiwopap.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/vemulepojekoge.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a84aa4bd4---xidaxutamuxegije.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/liluv.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/gv30h6ps45nhf0fh6ucl4opvr8/25901849904.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7d57d76ab---51562710284.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8fffc9749---debizexadisadozariba.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/vadojasipalerago.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801238ca2ef---38658476599.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161079b985b800---wilezuwugejagalaf.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b2d09c8dd---12412798071.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/juzoritinado.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160afe5ae1a642---14297391619.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/wizujuwewonuvev.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/24289941771.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/62480200177.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb4973fd84---63417329950.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f516d54976---53639447788.pdfIn PDF document text
    • http://rfamilylucas.com/clients/73238/File/97986916607.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/c362e0110f83670598bc44ca5fc0edc6/tutoxesa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=civil+engineering+objective+book+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_off0000e3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDB 10924 bytes
SHA-256: 0645a46fd14716c8484a0d810ec31871793b8ce23be71b87a4f73a586a2e70d5
font_02_sfnt_off000114dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DD 18428 bytes
SHA-256: db358e23bd2e89ebbe3bca903604390b5d2de43ba8299808b35bc4caab37c0f7

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