Malicious PDF — malware analysis report

Static analysis result for SHA-256 e40650fc3656a0d7…

MALICIOUS

PDF

119.3 KB Created: 2021-06-28 04:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9f736a47f4fe69f4ecfa85839cd158a1 SHA-1: c3b685e0c7187de6bca46116230ec0a6cfee564f SHA-256: e40650fc3656a0d7a0eb0860ce81b7e0b5a9fd8e9dd7cf7a48b762ae9de57e94
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs and links to compromised WordPress upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the numerous links are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://laborke.ru/uplcv?utm_term=word+associated+with+animal+husbandry
    • http://pensionpoint.cz/userfiles/files/linatoweson.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087015fb3611---vifimulutegux.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/2rl5tln8m4ljeiaib4eberqvo6/gevodarowepubofadijezeda.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/be18953f107dfd86c0754c3d4117e9fc/rolumukitetoril.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e968e5f2c---8793670147.pdf
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/97c0066f7f6b6417943f6551e911a7dc/naxuxuxanutefi.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b65680779e9---banabesozizimidegebabe.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/920ca9df4ccfe49a3e582b300979408b/64052697391.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/ibl04u09vu4l5hqrnmgrjk7sg1/gugefat.pdf
    • https://reniuved.it/file/kopidibikurujafi.pdf
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/218562221.pdf
    • https://aduanaldelvalle.com/userfiles/file/pifaf.pdf
    • http://prattsofdouds.com/clients/d/d8/d85aab9f4bcbae69c8358f7a9990a0b1/File/wokopavotesomipawepugax.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/9f62ed548da4bd300a4a813bb49ba853/25382641293.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe64775b27---5043400332.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160780533115c9---sejisujakadod.pdf
    • https://fotofidelity.cz/userfiles/file/39201835493.pdf
    • http://huiking.cn/uploads/file/18133802235.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607363e2082b7---jepiwowinuzovenegilosav.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/d53e7c754f2cd87defd29e1c72f46c55/ninulolalel.pdf
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34932624495.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ccbb3599f---vonifud.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/a573cc71cb67a0f7715bec1bd71ef331/riseta.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd0812da44---tusizetukizogijopinigiko.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_off00016f65.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16F65 16792 bytes
font_01_sfnt_off00018777.bin
a014a2e52e9194275781f33196f328fc3b5b9d8dd0ec4516fc950eecc965588c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18777 18084 bytes
font_02_sfnt_off0001b63d.bin
1a2bf8483bd51fc05d1ec0f6bd7318d5ba43ea2308f063464b01da1f2970c3f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B63D 11068 bytes

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