Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa826e85014ab668…

MALICIOUS

PDF

87.0 KB Created: 2021-10-05 03:54:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: acb9ce84adea17bcb6aa9206c6c62725 SHA-1: e9715af3a5c05861fa9228ba844b101261d87c7e SHA-256: fa826e85014ab668f9b7f51ac4a517770b5513c7ecb64c080c3e99de55793a2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many pointing to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious redirection techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://queure.ru/uplcv?utm_term=single+variable+integral+calculus PDF link annotation
    • http://pro-group.ru/userfiles/file/86900422321.pdfIn PDF document text
    • http://islenapuntos.com/campannas/file/2247308863.pdfIn PDF document text
    • http://sun-apartments.pl/data/pages/32654168536.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/c5c83b9bdab47f6d0bb16e21a76b5409/6155815983.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/repadujegitimodem.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/21551397426.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/62073004179.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/9e8be1691c5de122fdf810b1788328c3/dokiketebikimozuba.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/mowuz.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/30755364414.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/77347799139.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/xatukifutev.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd94a5e7e3---kewabalefukojotojelamure.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/71095192441.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140974b87307---miloxedizemufofosu.pdfIn PDF document text
    • http://zimmerei-possert.at/5151555028.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/nipapezetasozebupolimudo.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/dosoradezawitemubepe.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/wovofererujomijawebebo.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/161393f05960d4---67693761891.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/sotazovexulisututexegiwud.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16150f82e71a42---98392040345.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/xetasu.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_off0000e7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DA 10668 bytes
SHA-256: d4d798c83beacaf0361d32536069827fdfc28370e13709ff84ab9ed0e1ce64e0
font_01_sfnt_off0001006d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006D 20736 bytes
SHA-256: 49b3a646a2c4d83a79d4f5b30e1889575882105d31dd120f2292c8588faca055
font_02_sfnt_off000135f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1