Malicious PDF — malware analysis report

Static analysis result for SHA-256 2270c2cb268d4a1b…

MALICIOUS

PDF

104.2 KB Created: 2021-09-04 00:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eb18be0525f696bafc48b03de797d56b SHA-1: 6121548ee99a6e96e175501695a68c08c828bdea SHA-256: 2270c2cb268d4a1bd1ba4ef66676409d87b8783388544475836d788ca9220af3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm. Some of these links point to compromised CMS upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://franzoesischebulldoggen.eu/userfiles/file/nonipigu.pdf
    • https://aadharshilaschool.org/userfiles/file/wemagudanivoxu.pdf
    • https://sanxuattrucauthangkinh.com/Images_upload/files/danufawov.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16089f7af2ad37---foxogipagelepomovefezimu.pdf
    • http://kleiberit.ru/files/file/bixotatum.pdf
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/gerobulepiwokuguwenozani.pdf
    • https://108pizza.pl/uploads/userfiles/files/nekepetajivazidavibivamet.pdf
    • https://anyimaker.com/upload/users/files/22558936993.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/eef3e57344cb7acd6c69ad68fa23d930/33780123165.pdf
    • https://baxsporthorses.nl/userfiles/file/78792611893.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7fac946de---3386014716.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/4f4c5fdede232186099526ee8a4d4539/25859872478.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160951a5992f0a---30420723643.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087669701698---bupemojogixobu.pdf
    • https://ssvacancy.com/ckfinder/userfiles/files/71622075973.pdf
    • https://airflow-skateboards.com/upload/file/65968721141.pdf
    • http://yuha.be/_files/file/42410750020.pdf
    • https://hkpefa.org/editor_upload/file/pumodiwujariseza.pdf
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/83308003756.pdf
    • https://gute-reise.ru/i/files/files/botigeduwirolono.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=dogar+publishers+nts+books+free+download+pdf+2017
    • 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_off00012e3c.bin
e942702be7c2d8b0a7a3991baf915995899f9547359336519ddc4ec88fca2702		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3C 19316 bytes
font_01_sfnt_off00016046.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16046 16792 bytes
font_02_sfnt_off0001785d.bin
88713345319ac31c1b22716a5c408bf88e9eb4f4dd7355f40cf4810277f856d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1785D 11540 bytes

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