Malicious PDF — malware analysis report

Static analysis result for SHA-256 b17f6b4410e0dded…

MALICIOUS

PDF

84.2 KB Created: 2021-07-07 10:13:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 02f94f55fceffbf68a198160ba3f2e91 SHA-1: b66819de152f77f455be26478b61f5ade5273705 SHA-256: b17f6b4410e0dded3b4e3fecdf872a9dfc34f7366274ad1eafc795dd6763867e
164 Risk Score

Malware Insights

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

This PDF file exhibits multiple indicators of malicious intent, including links to compromised websites and a lure for downloading content. The ML classifier and ClamAV detection strongly suggest it is a phishing or trojan delivery mechanism. The presence of embedded URLs and the 'download button' heuristic indicate an attempt to trick the user into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://garglob.ru/uplcv?utm_term=outlook+mail+free+download
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/97a4b04f3ed07f5a552b06a1017ba336/guzisonowo.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/e09811196785f97ebc21176edd5bd62d/jurubeseguwupamuvuruxani.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfab1d6a14---bodulurikisopisep.pdf
    • http://xn--aknmedikal-yub.com/uploads/file/39911201061.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075df52d3db7---milirusumatupasote.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/862ad63f1b8ce99225872397fa999c04/fororoxafebuwojokupukerif.pdf
    • https://itracmediav5.com/ckfinder/userfiles/files/kilet.pdf
    • http://whitepurdeespires.com/clients/b/ba/ba703c466af5784ee38134b9d09df413/File/86923883038.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d01a1d830da---lafozofojapabijofuwe.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/6c79da88cd3ac5ec400b3765d25c3d55/95601010859.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/91c7d3ae95b8a8a5231eddbe72d65fd0/tuxujanivafowedeza.pdf
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/c68bf843f9bc998c56407f26edfab506/27865604816.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160864b34891f1---76830681280.pdf
    • http://luisacortesearchitetto.it/userfiles/files/gelurezosanibe.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16076d0ea7dfdd---99368804995.pdf
    • http://aarogyamedico.com/userfiles/file/63313960073.pdf
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tatabakajironozupapusil.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160dce5fe5b36e---putuwuminenefidol.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/d9d659863f5720538e1aeaa44df76008/nelafikaruludu.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16094abd17531c---valizekubobiginag.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817eec80b1a---77042892017.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_off0000e7b1.bin
357fc6a6b896a76eba12d52737e0bec86cb579b584b060d5aa69b8c03ff9ddec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B1 16816 bytes
font_01_sfnt_off00011352.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11352 16792 bytes
font_02_sfnt_off00012b69.bin
32158cc0fe791fe6e1bb6648121a08a8be82e259b97344432d30d1eb31306b0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B69 10648 bytes

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