Malicious PDF — malware analysis report

Static analysis result for SHA-256 066a671c1663bb94…

MALICIOUS

PDF

94.8 KB Created: 2021-08-18 22:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 23fb6fdc0272b3a5a73b43876fda3439 SHA-1: a85781f7df2dcd77eea35c33efac518ba758cb6b SHA-256: 066a671c1663bb9410a9d034ade56c277745e6931b5413af6163334dbaec60bf
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://print-printonline.com/ckfinder/userfiles/files/suverivuwaxilodimijevege.pdf
    • https://oversaslogistica.it/file/nukoduteb.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/rsi6qp2v4ch458a6u5hleamet0/zumafedexovuzikozetejidi.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/el97b4ir689ddlsjvuf2e6gpq0/39282865431.pdf
    • https://aedwea.com/upload/foto/80551744763.pdf
    • http://londonjip.com/userData/board/file/famolamugedu.pdf
    • https://laserbeautymachine.net/d/files/sexeduw.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a488e876b43---loweruxasesulexawawirezis.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/befmusn83b0s82ld7brmp90vp8/livapovoguj.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ecb64cc0e---junix.pdf
    • http://hdurmuslar.com/images_upload/files/kunidopi.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3996a1136e---57059620723.pdf
    • http://rollfactorytogo.com/uploads/files/levalazawaxovomagar.pdf
    • https://geniodelweb.com/file/miditiviruribojugunawadaw.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d96c4b7207b---57885810500.pdf
    • http://charivne.info/images/file/gikidevekaluv.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a056ba67da5---jomebafagowewosutorer.pdf
    • http://hasdeu.md/data/userfiles/files/zidinovuxaxipa.pdf
    • http://firanywiktoria.pl/uploads/editor/file/kufosijigilanijel.pdf
    • http://pozitron-s.ru/userfiles/file/tibekoxa.pdf
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/97917433855.pdf
    • https://okud-istra.hr/userfiles/file/xudatibubidexajovuwivov.pdf
    • http://poorclarescork.ie/images/guvubetumizone.pdf
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/53510570748.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=wahls+protocol+recipes+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_off00010f68.bin
3b70943b80648a8e1834db54f9cd64a58917744923b983d5fb48af39aa60ff86
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F68 17172 bytes
font_01_sfnt_off00013c5c.bin
75e1232ea4641e6c62b1f08c0c1d9c24a9ccace6df80a2c1bb1a5f469b81e574
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C5C 10608 bytes
font_02_sfnt_off000154c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x154C5 16792 bytes