Malicious PDF — malware analysis report

Static analysis result for SHA-256 593f772cc931fe12…

MALICIOUS

PDF

98.3 KB Created: 2021-07-27 22:32:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c8c436c8325f9214ea186bd490d9d65b SHA-1: 7c09ef405e00ac1d879eb31863c995c88a55dcac SHA-256: 593f772cc931fe1296cef423ed6c44ca765bff9fe3a7f59314f0e447bbf657f6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting it's designed to lure users to malicious content or download further payloads. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. The embedded JavaScript is likely used to facilitate these malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/48366628836.pdf
    • http://haozuowenwang.com/imagefiles/file/7645182784.pdf
    • http://geometrarontani.it/userfiles/files/refogowezuliful.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/1of7i6ad3enbrth71lqg7f1p03/lixuxedirigopenakag.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608647b3c98cd---napep.pdf
    • http://chiangmai-clean.com/user_img/files/wolokupajifu.pdf
    • https://lapalettedesarts.fr/gestion/file/81685707186.pdf
    • http://malverne69.com/clients/a/a7/a743c233813d1a1dbf5c38c484d85cdc/File/jusavabedojurotap.pdf
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e16b5b5ff---sasozuwaferopirogolaporax.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/a96398dfec1597a262375f351404e591/lolusajadupo.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/co1cdb37htf37nlnkdb0p1ovs4/81593892070.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d57b224552---gurojunulomex.pdf
    • https://standsimulator.com/ckfinder/userfiles/files/65754999773.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/3f49821f736d03ae4a31c49a9b5c0c35/jeduravipasedopifokifape.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099aa5e9e056---xebiroxireruvovexatibawi.pdf
    • http://tantex.org/tantex/tantexuserfiles/file/nuvebowamaxeb.pdf
    • https://foundryindia.org/userfiles/file/88094575562.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c1123db6491---muwumupisasijevor.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/4mrf2lpo626b8qau0ljtj9soc4/53770354791.pdf
    • http://scuderia512.com/js/upload/files/27831703564.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16076af5ae62ed---51278462776.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/7a1bbfee45fcf551e7ec5e9a1458427b/85650235484.pdf
    • http://vhktn.at/images/content/files/79221469886.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6b84be994---11107819495.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=academy+sports+return+policy+covid-19
    • 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_off000118fe.bin
f02c493128d3c832c03e3921e0053f76e3da38ca1660108d059f3b7ebd217b00
pdf-font-stream PDF embedded font (sfnt) at offset 0x118FE 11192 bytes
font_01_sfnt_off00013352.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13352 16792 bytes
font_02_sfnt_off00014b64.bin
72ba16848b4f0cada0a027567e575f0807279c0f1d4d82370739d31df6d9f8a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B64 17316 bytes