Malicious PDF — malware analysis report

Static analysis result for SHA-256 6253a116c0754d4f…

MALICIOUS

PDF

77.6 KB Created: 2021-07-14 01:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ca266d6889642a639e3f51aeb6ed6e1e SHA-1: 013a4146e6033471882c65058abd7beecd51f206 SHA-256: 6253a116c0754d4fa506424be5ef30dc61d0897bbe79492bc8456308a3dcd745
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of external URIs and compromised CMS upload links indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://krisoc.ru/uplcv?utm_term=melting+point+of+group+1 PDF link annotation
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a74e1d5bba6---22838102187.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b9be3c30524---6956557601.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160affe7ca6b32---pulokujafenidobimurip.pdfIn PDF document text
    • http://uniquestatues.com/clients/9/91/91c6e204ee4529d3b478b0717040545d/File/xaferiboxewadirakijujaj.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/229d155618100a084e4625eabbb1280f/84270173372.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/726e20b3a974c65542f090f3f9e56a38/24174290597.pdfIn PDF document text
    • https://wrd13.com/force/file/namujufexirivukuv.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/5311916534.pdfIn PDF document text
    • http://synowka.pl/galeria/file/beduxiwug.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20215132134456337.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f050c01d5e---52176901902.pdfIn PDF document text
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/4229154737.pdfIn PDF document text
    • http://51-lq.com/userfiles/file///90398686729.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/zonagiwejesoji.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/867f546b66344cbf2a9cf2de92813a5e/wogadizugifobin.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090aed2655b9---pugevixobulagekodolizi.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16089e7d6379ca---vuxojufevimotejaz.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/29602927813.pdfIn PDF document text
    • http://araonline.hu/uploads/file/bewufe.pdfIn PDF document text
    • https://kaisar168.com/contents//files/piwujagizawuxutum.pdfIn PDF document text
    • http://bakoca.hu/files/file/jamudofawuvux.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/tezapiwijakamavarubukam.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/jebolewivomudufujuje.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_off0000cf04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF04 16832 bytes
SHA-256: 66e9ce6ff3441c7b2fc99110a37c3635a7f41923101ab56f4993153178c66f36
font_01_sfnt_off0000faed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAED 10348 bytes
SHA-256: d41b8701c5fd4db32aacbef9b8c72bc46b3810c61b10cbe09478875de318a020
font_02_sfnt_off00011269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11269 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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