Malicious PDF — malware analysis report

Static analysis result for SHA-256 895f9b7acc2d91d2…

MALICIOUS

PDF

91.4 KB Created: 2021-09-19 15:36:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b57dcd8a899d3924e063afc4950dc749 SHA-1: 76ddc265dfa240cea136a1283fd6ce6e98648b67 SHA-256: 895f9b7acc2d91d231dd19eb5a9d82408e6073a7ce5195660838673d3c32453d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to distribute malware or conduct phishing. The presence of external URIs and a link farm indicates a likely spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=infinity+blade+2+android PDF link annotation
    • http://www.huntsvillepr.com/files/files/76768878780.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137d02b43cb0---tanojaxaminoladozenopag.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16140237d80c8f---fetofew.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/87491129878.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/mimeximosenaverafomu.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/dakifu.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1614438c4a7c6d---63029364340.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/61908127048.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/23051125833.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/9ce9cf9a5be6f43fc396dfc1d0c0e390/bowurifu.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/ximunakuxemafixesajopofom.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161414f724cc12---fujafugowelemariruz.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/jagixozesotanafunig.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e93e2c1f7---kuzuxakefujinotigaxan.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210909_207B2093EA514355.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/maleserakalebar.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/madawejafazadome.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/kinitoxeluzikixolakapu.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/48143528910.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c51a863fa7---setawu.pdfIn PDF document text
    • http://asja.ua/userfiles/file/mulokezisalinujeluvubobu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79B 2004 bytes
SHA-256: 89cd01d6aaa529676cd8ce2c7b68a34e1a55fb5e8efdc7dc98a3bbd81b1f0407
font_01_sfnt_off000100b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CF 10504 bytes
SHA-256: 7a039415d619c3c77a709583a17f1cf02ecbad0df39330994c326f266d9d5355
font_03_sfnt_off000130d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D7 18104 bytes
SHA-256: dccaac6a0e4a3f71ff55e3c4f8c715d2789b0341395628275f0aa1ed126aeeeb

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