Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a7bea3ff0aacbe3…

MALICIOUS

PDF

80.5 KB Created: 2021-09-05 08:20:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6b3ecdfce3021b4edf557c02daf46778 SHA-1: 1686332b0bf2e6ff568c054bc7fba5d4977decda SHA-256: 4a7bea3ff0aacbe3d544062d7e27f825909c31e5868f5048ab87a3397968d315
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The numerous external URIs, many pointing to compromised WordPress sites, suggest a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=solidworks+simulation+2015+pdf PDF link annotation
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1110ee98dc---87380136780.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/vevofkdnmbgeohas0gv32lqr8l/nedafasasadivasosi.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/28129730007.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f91fe6fd4---91470873067.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/bofabivuwikemesewitub.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/40497255147.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b86f89c0e---1474620269.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca4b2f17f3---78055308156.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/taduganowij.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/xokeduranozirigemaj.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/16352337852.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/misesifanogexojeruduki.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/45877618179.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/venesatogotumawazuzotiva.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/xakozuvalawonegoxalu.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/bufoxavab.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/suen23tdog2g99m6u7jb8pslfg/kitezefadupo.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/jugonemogazigunezetega.pdfIn PDF document text
    • http://jucal.es/images/file/vamelefufi.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16098ce1bf1bdd---96820316900.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/wujisepisafegediwifav.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7209379db5273b45e19b74b7ddd637b3/denudovupegexa.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/sojiriworomidavokof.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/34042987750.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_off0000d4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FA 17272 bytes
SHA-256: 77958795e9623312042da2b60459466e130209ad2d28ce2278209e6549c5f5b3
font_01_sfnt_off000101e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F9 11308 bytes
SHA-256: 035d7b3a8c3f07af9f3a65ed74e9d201572b78a093970bd4beeb3f5ffd9e7f87

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