Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a51443dc8f8b212…

MALICIOUS

PDF

86.0 KB Created: 2021-09-19 13:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5ac1cb4d97cc155c757bb9f73fe70f87 SHA-1: f8fa9ad72a74fd0d0ad4eb4919913a4d6b56e651 SHA-256: 4a51443dc8f8b2126cdef650c033070d168fb8c3eaa8f2948ef3fda1b323cd44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports the phishing and malicious content distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://pistant.ru/uplcv?utm_term=convert+pdf+to+excel+sheet+online
    • http://z-sinpro.com/upload/files/teguxebawoxov.pdf
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/77727158911.pdf
    • http://novastal.pl/userfiles/file/koroxefu.pdf
    • http://manilag.com/FileData/ckfinder/files/20210912_B9813414E20D1AF7.pdf
    • https://el-tall.pl/pics/file/94178825468.pdf
    • http://at2apigroup3.com/contents/files/vufekuropubajapije.pdf
    • http://hzdsbg.cn/uploadfile/1631530242.pdf
    • https://makiriaszto.hu/ckfinder/userfiles/files/89967558305.pdf
    • https://charterboatdeliverance.com/uploads/files/bimaz.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b500ac10d1---13623497011.pdf
    • http://cualuoiskydoor.com/webroot/img/files/70524195062.pdf
    • http://studiodabo.eu/userfiles/files/49237235866.pdf
    • https://needletherapy.eu/upload/file/39031980643.pdf
    • https://www.passion-rnd.com/upfile/files/2021/09/05/xevivirewiwogamalodo.pdf
    • http://interiorsexpress.biz/dayafter/uploadimages/newsimages/file/4149397772.pdf
    • http://pilot-market.ru/new/files/file/lutinudalufirujik.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362feae7fb4---sugobeme.pdf
    • https://funcarele.com/ckfinder/userfiles/files/41190117794.pdf
    • http://sperrincaravans.com/images/file/18709281603.pdf
    • http://dienlanhtruongson.com/upload/files/dutenufarivaf.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/4b89917537e0ec16f56c8273e2f08e1b/68425088078.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_off0000ec45.bin
ea11658a19a57087d53541f39eb99336cec3e8917d59bfe3a89357d1253e1358		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC45 17580 bytes
font_01_sfnt_off000119ab.bin
7c2785f56a809acc6b129a458470f920d6125e87ae68473bf8c924b93f954f1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119AB 10756 bytes
font_02_sfnt_off00013262.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13262 16792 bytes

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