Malicious PDF — malware analysis report

Static analysis result for SHA-256 af5d3ca8f0aa3c1a…

MALICIOUS

PDF

86.9 KB Created: 2021-06-28 09:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f34bc4ec08d1c6d73ca03b35ba90694f SHA-1: b0c64602e317b4c7e773a65df75206512388537f SHA-256: af5d3ca8f0aa3c1acbbeedbe56247d51c8cf1c98497a0f7384f2c3081da69ed5
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised WordPress sites, suggesting it's designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://queure.ru/uplcv?utm_term=all+star+codes+roblox
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4082421251c6210182a8cbeac025bf69/jemapowe.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d03ee6129e---68688545659.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16087b47dc6cc6---rixeje.pdf
    • http://chinajessie.com/seadata/data/uploads/img/file/16225159017.pdf
    • http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/noxiwikow.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/b8cc9ffc5227915275de900dd012bcc8/kuziku.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/53b0a650e8ccde3b6549554b9d751b36/40189690732.pdf
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/ca4443b86ec4d54e85d8e1dd3f7e7c60/gupifejedebatimezu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dacc9cc3ff---zefexekinemuvativexejeno.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/8mcd2ja094rlkt3covf9ge0kt5/wemifubakifufirotil.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/a172fbc41814f0dc88462000f1211e70/61506900980.pdf
    • http://www.bluewhaleline.com/image/upload/File/86161544670.pdf
    • https://bruceleevideos.org/images/file/70154197582.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/3blgjeac042utaqlakd9f4v5a3/zekowevuxaxebani.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f56c208edd---12519555529.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/7b4b3048ba8edab657f6d690cb4f83b6/77198245594.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2a9eaf97c---roxatuduropap.pdf
    • http://mayfamilycircle.com/clients/5/53/53cd9f4101e72b768929e5daf979c2da/File/wewonogitirajidolab.pdf
    • https://slaterlighting.com/wp-content/plugins/super-forms/uploads/php/files/9ea5539b739d02eccd82b407e73fc60f/31951259189.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b518a86494b---liseg.pdf
    • http://fly.no1-yes.com/userfiles/file/bokarasipo.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160baa3f139b35---kujakaxobumugagitukera.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085bba7242b3---dovedunitupugawin.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a07e4b377b5---79034959495.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d233cfdf5f4---91453557269.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef32.bin
082ad0c351d8eae87f24f69dcd80d7305cf9b26a99a4c595f186f1266efda1a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF32 10392 bytes
font_01_sfnt_off000106f0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106F0 16792 bytes
font_02_sfnt_off00011f02.bin
fb5c8b5a0306ba20f5f2382e9abd9e4b9888c4548937076e32af0ac89c4a975c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F02 18804 bytes

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