Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9f1c6e505155b90…

MALICIOUS

PDF

95.5 KB Created: 2021-07-15 11:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d28da173958f804d0fc79ac494ab72d SHA-1: 793369e86baf378679e38f9908fa34daa458e148 SHA-256: e9f1c6e505155b90cbb86c86a4a84d0ea1bbbdf80de75e734ad4e5c3e8bc6be2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. 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 0.9966

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://huntic.ru/uplcv?utm_term=land+acquisition+act+2016
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/bqa8nba0c9ao2s6975aku8ob93/kumubusoz.pdf
    • http://pahsclassof2005.com/clients/d/d6/d61c4c031b0f3af13d3e88110ef3a3e1/File/fumadavuvovopizefusiloj.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607f893e5f14b---43841671709.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077851bd9d9e---sozazasolomaxavizixa.pdf
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/c39ceb35571dfe5a936716e2a3852e9d/52469761655.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/c51abohtis03s4dn01d8t3gm4d/44849999678.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/defdea5b9ed9b3e276b47a5c86f2c037/xopewanudagolavej.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/54c45b2fdbcea88afe9203f3c96c2af4/jamolorokanikivom.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/lkebsoddm25ntvj8mp6bpfhbu9/77214422239.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/38aa654d13eb42065202c59e6a753289/jareso.pdf
    • http://agro-pasz.pl/ckfinder/userfiles/files/87713445136.pdf
    • http://apsara.ru/userfiles/file/vosipazixijovero.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/p9inev4l72ghffe2597song0gr/88346712858.pdf
    • http://patokapugsnkisses.com/clients/61143/File/32657122711.pdf
    • http://compsult.net/userfiles/file/40227282212.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/fef1biuqgpcl822jc1r38ombrf/33708244478.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/mdch6ommnl6ce0g3geca76ut6t/lonozejeze.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e0b87ca2b9d---nedogu.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8a0988d86---bifigov.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6780db40af---votoxakawewulofurufununil.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/hpsc5salchngfoqdeb75rloep1/83273784016.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_off00011362.bin
6e556ce795c6590f456a29fafd3908d8b49211a2e34cf0481e345fe005a5795e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11362 10748 bytes
font_01_sfnt_off00012c14.bin
a6c27a32c4de95f8602c189d55cfc800927b6e0242085b8d3f7e7bd1650ed8dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C14 17092 bytes
font_02_sfnt_off000158ec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x158EC 16792 bytes

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