Malicious PDF — malware analysis report

Static analysis result for SHA-256 25df34da855535fa…

MALICIOUS

PDF

83.9 KB Created: 2021-06-25 13:41:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a5590a81f3d7d6b8d691cb30f49697d0 SHA-1: 5e44bf027a58ad0cf042057f1004a46bcfc35b8b SHA-256: 25df34da855535fae1a51725f882c05408c0dd70492767fb1f28db71cf3c8381
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The presence of multiple links, including one with a 'utm_term' parameter suggesting SEO manipulation, points towards a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://smidgel.ru/uplcv?utm_term=anaesthesia+book+pdf+free+download
    • http://shuswapladystriders.ca/userfiles/file/9421385104.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/3ks9a981cf5t93dgu5pe38m0aq/zazevijuviduvaforiv.pdf
    • https://sieuviet.net/webroot/img/files/62034841061.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/7dc083307c3ce3f9b0d0a0820e57956e/wokosazinuv.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/pdppneic472mrkund0i1hji2j1/59956738344.pdf
    • http://www.medicellbank.com/userfiles/files/dajorevaronusufe.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0fd3e9f13---bizidakedidisanol.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/28ceb22e282d67d319d4780b96263c69/dunavibowodomo.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/c4df5c4df6863a9baadf723133d55f32/mevobetuxosodep.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a792918f813---fakabanaturidakebum.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/7bf4c3c3e2f7c29cbf9b789761546036/fumesunagibixirilej.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/dq3596v62ss6t1dhg6r5s44h96/46562861311.pdf
    • http://botosani.ro/img/uploads/file/62400540353.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607675805575c---ralepaborilewekekeraros.pdf
    • https://gastriklandsbf.se/UserFiles/files/53802037056.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_off0000e3bf.bin
f2fda1365f796e974732f838e6173f355e91e5601445faa91332658259a81b10		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BF 17428 bytes
font_01_sfnt_off000111b2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111B2 16792 bytes
font_02_sfnt_off000129c9.bin
9b2fea7eb28af675a19000066e19f9b80b203a78acb93f19148a0418ab3a90e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129C9 10892 bytes

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