Malicious PDF — malware analysis report

Static analysis result for SHA-256 a61a299342e957d7…

MALICIOUS

PDF

80.5 KB Created: 2021-09-21 11:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 306a87956cc3ed28df4d4c77d0d47f47 SHA-1: b1d73ee26d424e53721f516762b15aa9c8119322 SHA-256: a61a299342e957d79b96ebf48bef280a1b8d045795346633142b8d8aeae2abc5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the nature of the document as a collection of links on potentially untrustworthy domains.

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://queure.ru/uplcv?utm_term=day+and+night+live+wallpaper+for+pc PDF link annotation
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354653a8107---63335850952.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/62907533502.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///pulitavaroxuna.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/6564485527.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/79455161640.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/87446897905.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/10114641602.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/35962520638.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/vfahotm2qplbu6sour9d55blke/bujanokajel.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/59084821276.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/susupada.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/sekakejezakugebexap.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0599a3d62---93193362436.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/wixamawotobizotavabaz.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/22730545208.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/2009373289.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109100733189910.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/9362705124.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/jizamarudelu.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614046295ced9---wugonexalumoloxivego.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/43160579418.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/gaxokutilin.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/b7af95d4360e6f5e7e180f56655bcd72/10931929250.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/24573561544.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_off0000d447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD447 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5E 11000 bytes
SHA-256: a29082b0720dae67ecae4e892d3258a17c227ea660e17b51ebd17d4155dfb2d3
font_02_sfnt_off000105b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B2 17744 bytes
SHA-256: 7e43e20b98b36343f9d105cfb088f1131581116ffabd9f0530cf6139b16d3cab