Malicious PDF — malware analysis report

Static analysis result for SHA-256 1387dfc121e10913…

MALICIOUS

PDF

80.9 KB Created: 2021-09-03 21:05:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 740596bee9217604bc3c6c56ff17b6ed SHA-1: dbe7021fd36047dd3ae003b28539f4f43406ff75 SHA-256: 1387dfc121e10913fe557d9d41cc1d1953667e95b2d1236d361396df0225ebd8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://wastran.ru/uplcv?utm_term=ejercicios+de+numeros+enteros+en+la+recta+numerica+pdf PDF link annotation
    • http://www.amedna.com/userfiles/files/papemafuxixuzixepe.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/93997714876.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b767a720e9e---21066942257.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/34593078748.pdfIn PDF document text
    • http://newfieldclassof1982.com/clients/6/69/69e49ffade321d977af769e13f9f004b/File/22392883304.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/7042fd9dce415c1be57903bc36e1f013/28521362656.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/97717904142.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098cc093a8b1---nogatewesaporewofunipaf.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021060918124373499.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/5925137287.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/17575468160.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/20659268178.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/tozewixenopimiwutowu.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16117629c1e111---48885708762.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/98690967750.pdfIn PDF document text
    • http://www.sanruou.com/app/webroot/uploads/files/22618816723.pdfIn PDF document text
    • https://computerzone.pk/file/topamufemidojowor.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/99294005873.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/70f9c5c32f7941102b422cf9f9835bf7/vogutovubufufisu.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/zupadigedu.pdfIn PDF document text
    • http://4bx.pl/public/file/51633156018.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/5b848fa745fab0dd01038b428a858db3/46884360217.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/22004738219.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/ka5b1ehsjucqiudjn1mp7kvrri/7709977229.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/786bg6t77coro63ah8uc7glsob/pekebozug.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/lojogefigesizimop.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_off0000d598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD598 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAF 10992 bytes
SHA-256: 0aab56df2fa08736ce4cd34c9288ff38faf48686927e5c89f8571febf55d1cd6
font_02_sfnt_off00010725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10725 18452 bytes
SHA-256: 7ec329c640ab1b2900a646fbe4a0d8ffba46aec7f62c2137820b848a5a94a931

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