Malicious PDF — malware analysis report

Static analysis result for SHA-256 90fb621cc2656141…

MALICIOUS

PDF

85.3 KB Created: 2021-07-14 05:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dceac22d8a32239d5c12cf07a7029fc4 SHA-1: 474722cca71691c7c452c2d3981b945ef8fd216b SHA-256: 90fb621cc2656141f5f298bf1f2377a814f9b144cdcd484b4986fd0b8bacd7ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of external URIs and the overall structure point towards a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://infrive.ru/uplcv?utm_term=3+pond+3+temple+puzzle+answers PDF link annotation
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a37774bef20---37775670285.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/xigorixopom.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607a341d4963c---87441764142.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a96c6093619---pizajejud.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/belewinirozilemakusag.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/zoxalorevapomupifi.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097874be8242---25384452261.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/dimexanukojuzuputepeju.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/2437373176.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/renak.pdfIn PDF document text
    • http://carolstoecker.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/vilinivuwuvezotadariz.pdfIn PDF document text
    • http://texmet.pl/userimages/file/faxugijavelimog.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/6ec02c9561dfbd6f515cbc3c59f1575a/32085775342.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607627562f67f---wodozov.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/00ibbbu02s0ng1ljsgm15m8cn1/migalisuzol.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d950297e5---11777660881.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/wewazifabezudonoparonaju.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/tinewufisigulodepun.pdfIn PDF document text
    • https://emmaushuis.org/pages/56431383925.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/ab4fbc8ed634bb0fe65517f62133605a/96720266223.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160830daa829fb---82039720062.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/54bb1e44a6d9ef5bb0ea7cd77bc2106a/8540431621.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_off0000ea57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA57 17532 bytes
SHA-256: 9174a35b9f81edf2ab3d9a1aa6cacb960c125e0c1831126e440d7b41b95678ee
font_01_sfnt_off00011757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11757 10780 bytes
SHA-256: a478bf06cde0bf4c4ba0b1272f4ba38477eb5574e56b381d636b8ba63ed0adbc
font_02_sfnt_off00013042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13042 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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