Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aa0590f7dd9d6d7…

MALICIOUS

PDF

73.3 KB Created: 2021-06-26 12:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 44788a539e52938f579f5ce7edd2a58e SHA-1: 7b754b490ab9f54795fed01751660ac5ad6f7d97 SHA-256: 5aa0590f7dd9d6d71b91328eaac08668575e4eaad7c4644df9da1366e6216faf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised websites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure suggests it's designed to be a link farm, potentially leading users to malicious content or phishing pages.

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://cornerstonelaw.eu/userfiles//file/govetoburasonagutazoruwas.pdf
    • https://alihuata.com/userfiles/file/45521572999.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fec1f3a945---binuvitowi.pdf
    • http://cuacuonanbinh.com/userfiles/file/54025793182.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc890537dd6---61700610979.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/c0b391875bf2fe1e57484317ff409093/rubiguwonajebo.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7c090d0ab---pamivuvivedaxezuw.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbd24dcd5a---12022417412.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/c9496eb1aee0ee094369f650358be2f2/roloxevobezugi.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/7f05e9d9860114c35d7427af99d23125/waduverekologerenuxifar.pdf
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770ac4104e8---45251662054.pdf
    • https://churchofgodinjamaica.org/app/webroot/files/memikepemiga.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781aa1cf155---nopipixivoforalo.pdf
    • http://ekolojikweb.net/upld/userfiles/file/30313422961.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/32148abb1f00b88d22607f26466f33b1/worobupoxaledere.pdf
    • http://gasthaus-steinkirchen.de/img/editor/file/84502429648.pdf
    • http://sosnovgeo.ru/userfiles/file/90582475427.pdf
    • https://hyosungulf.com/uploads/file/ravigoloz.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/k9upb08282nbd61vp8897393re/3651756802.pdf
    • https://penal-garazh.ru/files/gitikavebazuxowiralikurir.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/4bf4fb3eb4793f6fb428e1981ea25318/genorojegutuvi.pdf
    • http://shethof.ch/cgi-bin/dynamisch/file/luves.pdf
    • http://614move.com/clients/4890/File/62680291402.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=causes+of+being+tired+all+the+time
    • 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_off0000bd40.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD40 16792 bytes
font_01_sfnt_off0000d557.bin
4b4a8d45ab68d39d1bf55a352cf317614b7be51c9bd221ed0d1719b120147dfa
pdf-font-stream PDF embedded font (sfnt) at offset 0xD557 11072 bytes
font_02_sfnt_off0000eebc.bin
02c7b7e133479c64f05a05b633f16166e961e00a60ef3c166b75d4cbe7b2841c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBC 15948 bytes