Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cc476e73e2ace9a…

MALICIOUS

PDF

87.5 KB Created: 2021-06-29 09:33:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 845bdce7b7d278a94fdf0f484f4eabeb SHA-1: 4d57b250a419d696365578b61ae04c9b0f6ff2a3 SHA-256: 9cc476e73e2ace9af98e8dc5faa173ae73a459ad7f06235303b7182640091a25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farm heuristics suggests the primary goal is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://chcial.ru/uplcv?utm_term=phrase+meaning+completely+spoiled PDF link annotation
    • http://chinamakina.com/userfiles/file/23573890035.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/5b437a42176b49b1bf02b5c979f60ccf/70805435050.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/lubuzawemipolubon.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/75925458089.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/muvonimewibobomometapekon.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/00fc90263c53a1688692f67bd2843317/xidomamixokuxin.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fde9a7bc23---96366746467.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a4763683a8c---25277291424.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/302e2224a8f10b78116376f6def255e5/wigefurel.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e025ba6d9de9fefadcbc95561e2ca98e/verixerojotuviv.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/gawuw.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/3tlphemhof9vav0f36gq685ic4/bodotoxigekugeropuwulodu.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/43457880210.pdfIn PDF document text
    • https://intellicapital.in/ckfinder/userfiles/files/6891739733.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/q6uk64gn1kjf4s1v9knpgfn257/69698912441.pdfIn PDF document text
    • https://condominiobrisasdelnorte.com/userfiles/file/28897171619.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/46578329733.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810f05580f3---58923991901.pdfIn PDF document text
    • http://www.ximangsongthao.com.vn/app/webroot/uploads/files/48435560685.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/a863ee4d870aa2323fbb358f8c741260/93425864850.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/89751085743.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/setimegulepusib.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/wexipajafizokonokat.pdfIn PDF document text
    • http://bluefield1966.com/clients/26642/File/60263027588.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875479c24ab---28010949220.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_off0000ef94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF94 11076 bytes
SHA-256: 1adb2be23a35759293d5af1c1e08001b1da89d0e7b42ffc4218469aaa0d09c11
font_01_sfnt_off00010906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10906 17576 bytes
SHA-256: 9f09e2cc81723ebbb9efe750972f1e98214914d31661550fc36479e9ff74c445
font_02_sfnt_off000136bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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