Malicious PDF — malware analysis report

Static analysis result for SHA-256 7829b056ee770821…

MALICIOUS

PDF

85.3 KB Created: 2021-07-10 07:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 27540040eb2821e2c3482d12015e303d SHA-1: 832f22a32c6a8394cf62cbc77580e5357ff9d16f SHA-256: 7829b056ee770821c10829f0ff1a8a87eee1fc498fb655648cc96546ab811f09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting. The embedded URLs suggest an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.alex-vasilkov.ru/images/wisdom/file/kukevesu.pdf
    • https://cyberbirddog.com/userfiles/files/27632442092.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ea6a25c85---vurimuxejedezakesuzem.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cfe170e504ff1744187cdaf0002e79b0/5589191813.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e4b644755---vejaxanuz.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d04e929b53---tenajikoweponinu.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d51ea7eb12---10123389497.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/b2db27bcb27240e14e0eb9f66413b93c/46424557421.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607f402f9705d---60915586387.pdf
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/penexilikonit.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708645aaa82---kezen.pdf
    • https://loyallcanada.ca/editor_files/file/3022155795.pdf
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/c7a09987980ce016a40b05dacbc7ff77/metisulinovifofav.pdf
    • https://canionglobal.com/FCKeditor/file/jemuwidegaxakid.pdf
    • http://syuncyoku.jp/upload/file/bijiworaxufojup.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/708ca9d0b6f444b923c35edf2afff6b6/valutawupeparawopofet.pdf
    • http://randalljroutson.com/clients/44711/File/34848414353.pdf
    • http://dzbnf.com/upload/file///53345555912.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0c2dbb3b6---lazuxexanezimopewepe.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/1c2824324699f0b2d4d3ea8738d9b1ed/rukumafagasan.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/gaxivolez.pdf
    • http://baigeleather.com/userfiles/file/vugiwozegabibidufab.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff18b8c4c5---tisibivosa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=need+for+speed+heat+2
    • 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_off0000ec90.bin
fa1f9b9b57903a302d684c021e9680689ec03323ba0c854dbab42a319a8e4226
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC90 10452 bytes
font_01_sfnt_off00010479.bin
871728aec1e4c54599c3041988c0cc8318d4aa16ba02b79ea774eb5d890fb1e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10479 16796 bytes
font_02_sfnt_off00012ffd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFD 16792 bytes