Malicious PDF — malware analysis report

Static analysis result for SHA-256 8640f0b65f1a4e89…

MALICIOUS

PDF

68.9 KB Created: 2021-09-28 21:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9726ea5552972ca2c664871aad01274e SHA-1: 2dff668ca74cf8ee45e3fdd454c7a515b34efeb3 SHA-256: 8640f0b65f1a4e895c597c40596970f8554d7228989863af00d93a28b1d2a303
164 Risk Score

Malware Insights

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

This PDF document contains embedded JavaScript and numerous external links, many of which point to compromised websites or disposable hosting. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm designed to redirect users, likely to download malicious software, as suggested by the URL containing 'windows loader'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for delivering a second-stage payload via the embedded JavaScript and external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 7

  • 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.
  • 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://pistant.ru/uplcv?utm_term=windows+loader+for+win7+32+bit+download PDF link annotation
    • http://autosoftware.company/autoresponders_images/files/46429178750.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/9722413094.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/dawutekakeva.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/g5v852dg5a9461497vjgb1gp4p/savejur.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/52550530466.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/majukiluwego.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/wisawe.pdfIn PDF document text
    • http://duz-drustvo.si/uporabnik/file/xesanikonaj.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/zomusipibudutazolez.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/17978259812.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/27202892487.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16141f39d99b60---60198047205.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/26892532928.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/56655475428.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/39009278181.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/bexipeduvalesidawusux.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/44297390478.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/5192801111.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/78468670992.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5f77d2d7c---jifepuzibufel.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/bajadefedawaduwu.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/xefudezonexa.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_off0000acf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c50d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC50D 10908 bytes
SHA-256: 5bb20cbaa3aef35751808b2763a84134186a91d1b78af62b24b6f0f17738eb12
font_02_sfnt_off0000de94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE94 14968 bytes
SHA-256: 5292f7d2e431118964598b4fe648de9e8aa882b6eb213d4f42d43b57a12fb6d7

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