Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3435e54f1f1b100…

MALICIOUS

PDF

119.4 KB Created: 2021-09-05 10:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: baca594ccc4e0e14b8ccc0397409b48d SHA-1: f56047e256df39a676f61a96effb3c0e21dbf482 SHA-256: c3435e54f1f1b1000b63d4bdefa1c38f5e51224c3c788d405da16f51acb72974
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous links to external resources, many of which are hosted on compromised websites or utilize link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of multiple PDF link farm heuristics suggests an attempt to obscure the true malicious destination by using a large number of intermediary URLs.

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://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/9893a23dd14e1d415d8393f26d2285ff/xexuladazapodikap.pdf In PDF document text
    • http://studioriggio.it/userfiles/files/muveguregawi.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/xajanugixev.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210728_FA5BFBC8C28D7C46.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/ed74d83e809030fdae07c92ba2b75644/7976468465.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/lolupakuwegofebu.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/0b982881d43edd0a736e60adee6de144/95087335196.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/16312401686.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/96189225407.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/mimadulafozutenofog.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/zetabixokegiru.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a65e143c368---28663471535.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a108c26aaa1---vokukarifopiw.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/d9952954020a77218fecc417232fd821/fajididalokodurisusu.pdfIn PDF document text
    • http://recviem.ru/img/upload/15866615790.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/48783033649.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c30cd2ba11---kikewanaragaladevikikupe.pdfIn PDF document text
    • http://nature-revive.org/files/file/130317647.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/ovnivrq44ju2p2omm305mf3une/36254557073.pdfIn PDF document text
    • http://dzbnf.com/upload/file///45388577603.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/42644770804.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0b1f4b499---moledusanosoxuna.pdfIn PDF document text
    • http://shatalarab-llc.net/userfiles/files/xitulojofozetakij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=scribbling+pain+book+pdf+free+downloadPDF link annotation
    • 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_off00016910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16910 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18127 10924 bytes
SHA-256: b6260e60e3dea13d22e8aaac76e98263b1432c8ab1502eaffe32fb1a1151e2ab
font_02_sfnt_off00019a29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A29 20416 bytes
SHA-256: 88adf37073b704cfcdccb8a5a93ae484f442dfaba060fb3f22d9b324ebc45fa7

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