Malicious PDF — malware analysis report

Static analysis result for SHA-256 80bafcbe4c79ff17…

MALICIOUS

PDF

81.3 KB Created: 2021-09-11 01:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1961758747defc53e33e1d3a25261568 SHA-1: 4de48951c4c7db42aa1eb97b9fba033606b5ee41 SHA-256: 80bafcbe4c79ff17e75c688c64122f2bf930857ffc3b37604ef94b657ad9a79a
172 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains embedded JavaScript and a link farm pointing to compromised or disposable domains, likely intended to redirect users to download further malicious content. The presence of a visual download button further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=product+key+windows+8.1+pro+n+32+bit PDF link annotation
    • https://biogenetixpharma.com/ci/userfiles/files/tirosus.pdfIn PDF document text
    • http://enewind.com/pliki/file/86021040994.pdfIn PDF document text
    • http://millecolori.it/images/file/47980036641.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/gavomunelefuvura.pdfIn PDF document text
    • http://getvisa.ru/images/File/17593476156.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/21857977377.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/sufipogadofejizebefivanu.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/56211980892.pdfIn PDF document text
    • http://www.nena-artspace.com/ckfinder/userfiles/files/13396752065.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/nigumogatak.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/fd623cb34ba9400ea33577d943329f8e/75633993546.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/1914486236.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/gajufemat.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/tutigutus.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/xukezafizipugizoderor.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/toputeteso.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/54208769647.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f723569990---pexiwugivosejoxidoke.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/38600318586.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/3316128294.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/nefez.pdfIn PDF document text
    • http://altus.pl/userfiles/file/34292465145.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/58766272532.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131302a438d5---punodujedajawozefefamufa.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_off0000d521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD521 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED33 17964 bytes
SHA-256: d9f2261154e1c6cac1bae513ae7d725a5c44693103768697093637e080d10826
font_02_sfnt_off00011c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C36 11448 bytes
SHA-256: 520c81c3d17d6e5b2ab6d48ef2f7d814f383cd91bb75964e065ee0dbfd6c3a64

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