Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef12e0878b094767…

MALICIOUS

PDF

85.9 KB Created: 2021-09-05 06:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 858577a73d86ea603958090979ae654a SHA-1: 3cdde19e9b8dd8900bc22052a200467872eec530 SHA-256: ef12e0878b094767e559536651510ab216eed553a597ee4fcd3c7fef141bff98
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to various domains, many of which are hosted on compromised CMS upload storage or appear to be part of a link farm. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to direct users to potentially harmful websites. No scripts were extracted, but the overall pattern is consistent with a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9709

Heuristics 5

  • 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 http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0ad79cc1c---38178189363.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f00c3233fc4---45223942221.pdf
    • https://psychotherapie-coeppicus.ch/userfiles/files/77174304073.pdf
    • http://stensoproject.com/userfiles/files/mipafetizenanilovo.pdf
    • https://rajatotogroup1.com/contents//files/xibomo.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/neoqdrmi50eqc333r61b5cqmc3/50572371048.pdf
    • http://bbbswalkforkids.com/clients/c/cf/cf8d0549bdc9bbdffca8bc0db9808b96/File/37580053325.pdf
    • https://peterdegendt.be/file/25098203322.pdf
    • https://jagamimpi.info/contents//files/tubemusejupumarubelimug.pdf
    • http://efeotokiralama.com/Upload/file/80390367740.pdf
    • https://washlounge.in/ckfinder/userfiles/files/pigavokatawaxotudata.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0024a83a1---zisuzutabixi.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb14cb45ac---23054330858.pdf
    • http://esebtekstil.com/resimler/files/gadijo.pdf
    • https://poker-fire.de/file/35124056237.pdf
    • http://nikolalepojevic5.com/multimedia/file/wizivirizixekonin.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aac9a411fff---3976225995.pdf
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/3561403836.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608573478c344---86105742697.pdf
    • http://cnzgks.com/userfiles/file///38907887337.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/92sdcgivnjt3qqnu02lcle2mcd/37713440092.pdf
    • http://hamyarsanatco.com/ckfinder/userfiles/files/49012014119.pdf
    • https://lawina-radom.pl/files/file/fituwugisevidig.pdf
    • http://xn--aknmedikal-yub.com/uploads/file/31747327095.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/qjak2bj289692qkrl6tbuusta0/81064914887.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f44ebd3c7---24244895407.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=telugu+stories+pdf+books
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0e4.bin
1273285d78a8ffd2afbe54874c03e63d18a6d1662379d27223a58d9ea5fd3bf5
pdf-font-stream PDF embedded font (sfnt) at offset 0xC0E4 22388 bytes
font_01_sfnt_off0000f91c.bin
903d73e850ed725843e9597fe93f8e516bb4b9dda822d1dfff924070f03aada4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF91C 10700 bytes
font_02_sfnt_off00011152.bin
ad4ccb3137469596940ed2f52b36151577ba2ae685be09920ea2ba3bff0db593
pdf-font-stream PDF embedded font (sfnt) at offset 0x11152 16416 bytes
font_03_sfnt_off000127f9.bin
228445a3744f13af4bf84041e55802a923554d86926eb0745489ea117e4ab105
pdf-font-stream PDF embedded font (sfnt) at offset 0x127F9 1888 bytes
font_04_sfnt_off000130c2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x130C2 16792 bytes