Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e53e861d88f1e5a…

MALICIOUS

PDF

92.3 KB Created: 2021-09-01 03:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b92cdd2750636c9ddc3be43b4d4bdeae SHA-1: a2a87a1719d3f7a4676076fed2b1491952893e77 SHA-256: 6e53e861d88f1e5a7f622a7d7f69304513603f6db1e3144e8b87b38bdce95bf6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file 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 potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and embedded URLs point towards an attempt to exploit user interaction via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://inwebjor.ru/uplcv?utm_term=its+wrong+to+try+to+pick+a+girl+in+a+dungeon+season+2 PDF link annotation
    • https://cleaner.pl/userfiles/file/16857803066.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/52585141580.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/a52n5qjk7u3jt4or0uaphq4j4c/momujowolaxovijamezamurun.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cdb50ce7527---67934848186.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/3676d14d0b9c0321fd566113218e6c51/liminemowobelotijisoseje.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/v18kq0v5dkfrh1d8kibtveg2m5/sosiruvafagelerulibas.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/2d5207c4b49a5c0309d1ff76f0271691/dirakevubofemud.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/b2f66f5e4785277f75a88f307bb4f37b/dixov.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/kodurupek.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b066ad9e6---65456702118.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/ruxumuruvatawoxukoninad.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/lamavem.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/sizisenuzebalivukedipub.pdfIn PDF document text
    • http://anthonyellisonfamilyreunion.com/clients/f/ff/ff850d76676c1858bf5e443b7a907d3b/File/80939943656.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bf5a19176---17631678614.pdfIn PDF document text
    • https://tckontrola.hr/files/84556140908.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/b6u31l9ut9qp73as31len878ji/tefavar.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/gogidukupoxuxarojadunuze.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/ditawosimigubos.pdfIn PDF document text
    • https://urbanshapes.in/userfiles/file/23313020225.pdfIn PDF document text
    • https://spiuruguay.com/ckfinder/userfiles/files/bupizatopitas.pdfIn PDF document text
    • https://dm288.rs/slicice/file/xazilojaxosesoxifujuso.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/rrpjn4e9d5kl399mvgts6u86jg/folupaxixorelujijexalewu.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/69205080908.pdfIn PDF document text
    • http://alternatifmedikal.com/img/userfiles/files/38272880920.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_off0000f4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B6 11152 bytes
SHA-256: 7ea4e8949f6aa400580a4757079101884a219d6234d212bfaf3a6e1522f1f606
font_01_sfnt_off00010edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126EE 22924 bytes
SHA-256: 4732efb46efbfa356826e6ae854048845cb25cdb1630ec5116cbfddb84796875

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