Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7741d853bb3af56…

MALICIOUS

PDF

86.5 KB Created: 2021-06-27 14:57:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6c74e34ae5b6d0b57d554ac79bd46b51 SHA-1: 0f8cd20e4515b055751da1a9c4de560db84556be SHA-256: f7741d853bb3af5634c74bbc13e4c4677dd0dda0ff9b2d83f0cce29c07edefd3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://medvor.ru/uplcv?utm_term=wireless+mobile+charger+project+pdf
    • http://energo-market.ru/sadm_files/reduboni.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/13f5bc2e89af244df3542d0eabe61e09/9230897128.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb6812fee6---pafer.pdf
    • http://langeline.com/ckeditor/upload/files/dekadimudajobugalado.pdf
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/053a133cd2d859b2a5636df988da9d18/35688611166.pdf
    • http://www.ximangsongthao.com.vn/app/webroot/uploads/files/lasaf.pdf
    • http://happypalettebnb.com/CKEdit/upload/files/94818571878.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e90a40ec39---56557285327.pdf
    • https://kaptenhoki.com/contents//files/besev.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/8dc76c13b251dd663589bf882037e140/82773243650.pdf
    • http://2016montemayorreunion.com/clients/e/e5/e530e98a7ee505477716bae2fe71cdef/File/72187550711.pdf
    • https://shidoremicrosys.com/media/76058431798.pdf
    • http://lasfyy.com/uploadfile/file/20210621234948069.pdf
    • http://quickvideo.nl/userfiles/file/nifalesozifilutesesubap.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a31f23cd1---34247521609.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/lploc539u92ej10jaup54uoe02/rameburajuvot.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c5e9f04ec---8509726178.pdf
    • http://akkoryazilim.com/userfiles/file/2983103222.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/9d45797ec495e696ccaba427a5388603/35314040865.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607eeb73a8fe1---28645943114.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/11efb0260720c28112f4260806c2347c/wifubipukevabalokuwokame.pdf
    • https://abe-rdc.com/userfiles/file/92225565552.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/87sfnmaolh8si6891l4gisbb67/7205918135.pdf
    • https://cafepiolho.com/uploads/assets/20886852773.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_off0000edcf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCF 16792 bytes
font_01_sfnt_off000105e6.bin
5cc6b440d72c9732f0c8f0eb1d37516c76013220703e4bbcf89ecd33495a5c2a
pdf-font-stream PDF embedded font (sfnt) at offset 0x105E6 11228 bytes
font_02_sfnt_off00011fc6.bin
63e5e6bfc8cadf0fc7e3adbe7ac1adccf68cde071089d5df6c848af0ea8e2c91
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC6 17304 bytes