Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ccef529459b157d…

MALICIOUS

PDF

97.3 KB Created: 2021-08-14 13:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 05ce37773a7769623a5d4e01e2e010f3 SHA-1: f23243976d0f74e8d5986acbc104490b09ab28e9 SHA-256: 3ccef529459b157def422f6052a57d8a8c88904ddda8bac8884ea095805de513
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous heuristics indicating it is a link farm, with many URLs pointing to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download 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 0.9985

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://aaaexpressheating.com/userfiles/file/pazenav.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/806694c93b89c55d05e1f34d5dda1bd2/70507105468.pdf
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/1507599824.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7a1c53c00---jedimukurufubapav.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/23074f04337f5968d17fef8b364345d6/16704871774.pdf
    • http://tuzvedo.hu/elemek/file/nolazum.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a98af8ccc88---narosovizabaliru.pdf
    • https://jagamimpi.net/contents//files/66642746101.pdf
    • http://157.230.241.115/image/upload/File/10463596689.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/362071185f8b2a11272f9a3f00941aba/95960775144.pdf
    • https://myclubowners.com/userfiles/files/jakig.pdf
    • http://kiuruvedenlukio.fi/tiedostot/file/zesigopumesikev.pdf
    • https://akvaguru.hu/user/file/tiziguzukovepalavabaxoleb.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/moneg7q6r7ilq5l47hf96v09ca/zudazedupala.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/e47dc13acd24f808cfc12f1a24ad2a75/zebajamerixelevijuzasen.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/188f5abab103e04057e298f6dc27dfdb/jibibud.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/b444a5c067e4e32fb9cf80daadd1ca8f/80779645105.pdf
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/cf4ce026c35875ca584ed50c6d95d85d/20442777877.pdf
    • http://www.urbanwaterways.info/files/81861839957.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fab32b1bb---gaxutotekugovamokoruvafit.pdf
    • https://dewalt-naradi.cz/media/upload/editor/file/46488864536.pdf
    • https://hojoairport.com/images/file/mixopane.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=c+p+singh+physics+book+pdf+free+download
    • 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_off000114e6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x114E6 16792 bytes
font_01_sfnt_off00012cf8.bin
aa48a876d0381ca822b96115a828d161ad090c03db63408ea7a0d22c0738bde9
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF8 18452 bytes
font_02_sfnt_off00015c6a.bin
48afc7735f6ec27cb45b89ff5c970829db8439743499998bbc7050a8fedfef41
pdf-font-stream PDF embedded font (sfnt) at offset 0x15C6A 11264 bytes