Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca266c77e875884b…

MALICIOUS

PDF

80.8 KB Created: 2021-08-09 08:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f484a3fd135e5b7be8924937c5c6c823 SHA-1: ae5bdb9afa4076bd57766b1dd2a8fa07b9c2c05d SHA-256: ca266c77e875884bb572402c9b5404709785ac825bf915e49f1f16453c845914
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous links, including one pointing to a compromised WordPress upload, strongly suggests an intent to distribute further malicious content or conduct phishing operations.

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 http://goref.ru/files/file/pumeseginikal.pdf In PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/b32b99a4c94042c5e23b5469e2437d3a/23066916897.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f004338552---83838174135.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/0c101e76149bcb9d07eb5f141ad48b76/gerajomoti.pdfIn PDF document text
    • https://tenutaedone.com/filesUploads/file/wijivisuxukiwilagineri.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baed9eaf462---wewulim.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/9hvcjsgpl27d4vd61n17f4oev7/50403751941.pdfIn PDF document text
    • http://groupkaishan.com/d/files/35300068783.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/9puvbhe26rfpt2ke1jdijnkc4h/memupefidazoj.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/a02ad8c606ed623bf70d0e69f2ad38bb/mojupupivubeparopisodej.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/kpu5cqc6inj6n7c5kbaetd17fh/divotulomakivizikakujazif.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/3160435605.pdfIn PDF document text
    • https://beaszemin.com/files/86375702773.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/1067528e4dccdfe0ca2532921fd0eb90/22015465775.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/cce3712d5673b2b40ec42d28d036579e/zapokogiguwobura.pdfIn PDF document text
    • http://bollywoodsalonskokie.com/admin/images/file/galidibiwemukivegaxe.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/4ca24991e060548a4536c39ad01a8ceb/23413604583.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/ff937dc0757f09f8153c9342a8a4f5e3/wegufidixifakuleso.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/53934139002.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6958b6a7c2---jevasig.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607534656fd66---tenurepefonidawuxelewanag.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/lt1algv9sf2mg9s6fabv8d971d/terutuvolajejo.pdfIn PDF document text
    • http://stavbyhes.cz/ckfinder/userfiles/files/7889768872.pdfIn PDF document text
    • https://orsolyajuhasz.com/ckfinder/userfiles/files/kuzefosakoleguvizalij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=indirect+to+direct+speech+worksheets+for+grade+6PDF 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_off0000d752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD752 16836 bytes
SHA-256: 4efd7bd76120366bb18f72fdce22d4c730172788eba2b2efe480d2224093a4ff
font_01_sfnt_off000102f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B09 11152 bytes
SHA-256: c2d23eb9c6897dc92c0404257c2239785ca5f9b6b4fd02ae0f7ef03fe9b4855a

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