Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce4a95aff3b1f9c2…

MALICIOUS

PDF

76.3 KB Created: 2021-09-01 01:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8497e7a5519295057abc1ad846296c07 SHA-1: 5574529c5250a9eac37f0e61ef79977720127589 SHA-256: ce4a95aff3b1f9c2aaa2972eaa872a759f60222c6ad213fa9fbe51e40cecc00c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and contains numerous links to disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests it's hosted on a compromised WordPress site. While no scripts were extracted, the PDF structure and link farm nature suggest it's designed to lure users to external malicious sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/c9ab0bdc1f0d011d2053fcd03ec3d5e7/nelujufelatemisif.pdf In PDF document text
    • https://flyfinz.com/userfiles/files/fiwexunexedemozomanexatip.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/xarasanakava.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/kotodaxurajekofalobu.pdfIn PDF document text
    • https://ptogel2.com/contents/files/pajilomolutodid.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/damodenufaputo.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/b60co40hkrs2c4i4tc2rpvnhg1/vawivututude.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/xibudube.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/93345696960.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/55445607553.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/95553757569.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/jizupisebigotadejonizisa.pdfIn PDF document text
    • https://nada70.org/userfiles/file/37098399984.pdfIn PDF document text
    • http://yanartextil.com/firma/files/56384617516.pdfIn PDF document text
    • https://mimpiindah2.com/contents//files/18283374966.pdfIn PDF document text
    • https://chp-travel.ir/data/file/fifel.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/noxer.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/89778545852.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/cc62390f87626123cdd6983a4e67825b/35407137615.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d22c818d14c---leleze.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/72829646719.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/titasamozixejadoginizesaf.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/24756738620.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/161092bc67fc60---rujowibix.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/sakoparosemusidiwavi.pdfIn PDF document text
    • http://1carl.com/userfiles/file/supezuruvuvesaxobafarus.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/72790d241cdcc10964b690939726a383/bejigixepojuxelugukelaro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=a+weathering+with+you+full+moviePDF 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_off0000bf1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD736 10840 bytes
SHA-256: 9d043c9835635282917665ba39744e6c32bb3f9c9c7c8053c6442d42dd921bfa
font_02_sfnt_off0000f020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF020 19340 bytes
SHA-256: c48162bfb92f213cb8d66737ac5575762e8e5af85b56f10452bc260162b9d9b7

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