Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f7bb7c77f260f7…

MALICIOUS

PDF

83.8 KB Created: 2021-06-26 00:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d4805c0fc5f39570de8f8507d014d8a6 SHA-1: 31756eb4977afe75833ea380263d4be658acd913 SHA-256: 85f7bb7c77f260f76997e6b2c48bf50022e5d32e39542455623c4ece682b986a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload locations. The presence of numerous links to potentially malicious PDFs hosted on various domains suggests an attempt to distribute further malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://ebsenglish.net/_UploadFile/Images/file/97572737484.pdf
    • https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/b06178826bd61e125fc57714f5824ad5/42506686464.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef619c6a1a---21573136029.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c99b48afd50---65755599918.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e90ec913d---torodas.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc3a6f056fc---zeduxesipiwabezivadejugor.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607383f31c596---66289882131.pdf
    • https://isleo.com/i_photos/file/nipovukaxoleligebudogitig.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c473e62efe4---sanabazewovepiwuvujarid.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/141ed42e67bddc1b2197f024f18c111f/gedopokukeku.pdf
    • https://service-panev.com/userfiles/41127254962.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/007451ae62bd934b7d6f49bf515a8200/lezufunoba.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a022d350d34---15899942782.pdf
    • http://xn--eyt274i.com/upload/files/xamevo.pdf
    • http://wsp.pl/userfiles/file/92928918901.pdf
    • http://princeton1959.com/clients/863834/File/pinivuvojetomaruzuguma.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/6a34517d7e4d79d34da75517c41cbb04/40679233229.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c1ed8d1aa---ridasun.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd525a3ade---gakani.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/83f0b4ae64a6811709cb243501d78104/95509948561.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8a511ae1b---zarilolimewowuje.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/8olvntpqjcshg0am9ocbon3n28/xedojibureziselowuzadus.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/fd81d21884650b63fa6b0a55667e6310/kegudebosabowekurozar.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091c8525a073---patejonasej.pdf
    • http://womenwhorockarkansas.com/clients/4/4c/4cfcdabbb7b8ad81bafe9a4295858145/File/guredupufinevupekodolubo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=too+much+hdl
    • 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_off0000e4b4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B4 16792 bytes
font_01_sfnt_off0000fcc6.bin
ac677608158b0dbdfd4f99944eb13a0f8a78fded30bd4066c90a1b8e3d3205fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC6 17648 bytes
font_02_sfnt_off00012b69.bin
25db92f0876b4625425335f6de3cc49501a59b049e6ae8f96372767cfbff0c2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B69 9844 bytes

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