Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d6624e26693fed3…

MALICIOUS

PDF

86.0 KB Created: 2021-08-06 03:35:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 757cbfe837fd6b6012cab5c2574a1ccf SHA-1: 593cb718c90e48cb68bf56edd1e0f98ef99c2f4b SHA-256: 5d6624e26693fed3eb46e02c9667bd3519621fcc24c4f1fe681ae285363a8478
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs, many pointing to WordPress sites utilizing formcraft or super-forms plugins for file uploads, suggesting a link farm designed to obscure the true destination. The presence of these links and the overall structure strongly suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=jawahar+navodaya+vidyalaya+2017+cut+off PDF link annotation
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c83552c9a1---8148005413.pdfIn PDF document text
    • https://tidaksusah.com/contents//files/39253260604.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084f0601c9d4---28140777892.pdfIn PDF document text
    • http://prmakeup.com/Image/files/4350015964.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/dngq1sga0ovvl23i0gab6vqmqs/47270662179.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/ad35d1c21bfe03d9028dee7051f8b847/zuvuvedumitotewut.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082237607bc1---bijojaberumarosuvegi.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/zaxekugobidosugu.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/59428097019.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/wijeredin.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7edc2d463---41777879835.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/pivopopafatemurezaxu.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/jorefifaxijupuva.pdfIn PDF document text
    • http://www.christianhouseshare.com.au/ckfinder/userfiles/files/dalodukonoxip.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/92653365322.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/xulojilijum.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609358dd4da53---49333332223.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents//files/94956477237.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f2c8b2f87---tasigigoratisisonowa.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/kogizakosejedamino.pdfIn PDF document text
    • http://slp70.com/clients/873855/File/78897855940.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/bukobobozowazarobo.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/tutufukimigidepino.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/15091493134.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/01fe70428cd163a4fa47eeabf3d3c201/67528218947.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4F 16868 bytes
SHA-256: 5f400b7df5454ac45bc574785cc233a0c3710100425ce62cf0cfc4eeb31f1ee6
font_01_sfnt_off00011874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11874 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001308b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1308B 10976 bytes
SHA-256: ca69eddc01091dc84b4227b643cb89dcaa3587bc6190f9ee57293d1b367951ac

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