Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff61bdfc1bd8e22d…

MALICIOUS

PDF

82.3 KB Created: 2021-08-25 16:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d2f66cde3c6502d3ce984d7f39e2740e SHA-1: 4f0a56e13a790c4118d4ec1dea45ba18eb760dd1 SHA-256: ff61bdfc1bd8e22dc6ea5cfa6e1b5e7428dbaf90be8851ec4828da2c031d58e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links pointing to compromised CMS uploads and disposable hosting domains, suggesting a phishing or malware distribution lure. The document's structure and embedded links indicate it's designed to redirect users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=6.5+kg+in+lbs
    • https://hansenlight.com/UploadFile/files/dawukikovofaxaxemelewik.pdf
    • http://camwater.org/media/files/11920159013.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160883d1aa45e0---sinorivane.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/jt8rjesrmmg3pjtbn53l1l09ah/4200389621.pdf
    • http://www.alfapilates.pl/upload/file/61200227413.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/siimf9l47hlcql1i0uf2lh8l3h/85465577202.pdf
    • https://residenciasanamaro.es/userfiles/files/zitasokekomenusekalulup.pdf
    • http://hevolta.com/upload/file/sifurizalegomutigido.pdf
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785bd6af5c6---86942699173.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/l484e8nuvq2fu8pvi4idio93m5/87997790827.pdf
    • http://archerelectricsupply.com/userfiles/file/23679181117.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088de02187c7---simixizirezum.pdf
    • http://problemconsulting.com/img/download/files/11802306792.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/95a81d3ab7b64ac434b1e5cfae8033be/55122966155.pdf
    • https://ceccarmehedinti.ro/userfiles/file/82175422547.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/059bd7dc86022202aaf69e058a11c0f2/memavuvet.pdf
    • http://vallovin.it/userfiles/files/66445949930.pdf
    • https://medbillings.us/lightspeedweb1/file/43587010342.pdf
    • https://khogiaydantuonghanquoc.com/images/news/file/82082929857.pdf
    • https://eghamatyab.com/basefile/bainbookcom/files/81433014925.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1767515c0---86563556210.pdf
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/25659065720.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b8a02bb65---7078478426.pdf
    • http://propertiesforrent.com/userfiles/file///68784080981.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_off0000e08f.bin
a842bc80980251d8cd76f36a1a81b75eeb8f749e3efa9fa8740ee48da1ece959
pdf-font-stream PDF embedded font (sfnt) at offset 0xE08F 17632 bytes
font_01_sfnt_off00010cd7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD7 16792 bytes
font_02_sfnt_off000124ee.bin
7308beabd7ae5dafa9018db6dd8e60389d0212a9271779adcaaee0c0401cec8d
pdf-font-stream PDF embedded font (sfnt) at offset 0x124EE 10176 bytes