Malicious PDF — malware analysis report

Static analysis result for SHA-256 7692dda1837121b5…

MALICIOUS

PDF

76.8 KB Created: 2021-06-30 05:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c0e110a5a649ef90244e2d678b4bbb27 SHA-1: 492fb8626bacd25cc2217a1ea481b8141974816a SHA-256: 7692dda1837121b590216c3bf176f5d84bb8f19ef155e4a3bfd1ea91793b7f25
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially harmful websites. The presence of compromised CMS upload links further indicates a malicious intent to host or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://inwebjor.ru/uplcv?utm_term=linear+algebra+and+its+applications+5th+edition+free+pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6d8408a65---zofibugumufedam.pdf
    • http://bafiti.com/sklep/userfiles/file/53470558054.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc1c2d6c0e---zamubuxezixixonefajaziwo.pdf
    • https://magyar-logyogyasz.hu/fileok/file/modizumudadogibupexopozor.pdf
    • http://bertrandetgastineaudesigners.com/userfiles/file/73213725585.pdf
    • https://baoyi-chuck.com/ckfinder/userfiles/files/25727352050.pdf
    • http://immodraft.nrw/images/architekten_agentur_images_/file/54084815391.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f016a2b64---vipeluzutuzivixenoze.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/2ltmquhjmrc9s7p7i5m7m0ajl7/2967923018.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/9g06cv121eacab5r6j6dh956b2/fuvudebulurifagafujavovu.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/f5cbaa21aed436f4fd8833f54213fd28/fugudukogud.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608549e35a16c---munukevevivofo.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/85a0b6385f79233bc348fb7d51f87111/korijisoz.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/c0101b075c4b2b9444973018b2e2c9d5/pojumigekomuko.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/ru3gbdfml3um0kgkfto674b7rc/zesupad.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/4c187d5381236c6616bf6bbeb34af65c/11712254487.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/3720186134fe2b4652aac0d0bb49c3df/bekiniwav.pdf
    • http://falerisztika.hu/tmp/rasurojubefiwigisib.pdf
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/wejimunel.pdf
    • http://kaowei.tw/image/files/20210603_125114.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f390c528f---44897510739.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b13983cf2ad---95925683975.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160889e97413fa---22004352925.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_off0000c65a.bin
a12f4db16ecb2911f4e440be35f591f19f5c4eb3cd359ae316e2034bda0a10fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC65A 11132 bytes
font_01_sfnt_off0000dfd4.bin
e74f13c467a081a66b236b2668029c67064abf4ae6e60677a2e537a5eb149e25		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD4 17416 bytes
font_02_sfnt_off00010d64.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D64 16792 bytes

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