Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa1e417fe1505e96…

MALICIOUS

PDF

76.6 KB Created: 2021-09-16 08:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a17909c2c11fbc6596b812d4044ba9f3 SHA-1: 40894ab51564fb56dd070ebca93682a0096291ce SHA-256: fa1e417fe1505e96b2d84f2ec949038919d473d11826208ea4eabc4fc93ff160
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to lure users to potentially malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 http://taispacedesign.com/upload/files/beviw.pdf In PDF document text
    • https://gdwtechnology.com/fckeditor/file/In PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/48038830198.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/fotapevuzeku.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/xezemupipasowura.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/xaxuvotidegeledepusizup.pdfIn PDF document text
    • http://abpaluso.com/upload/file/mubevitapud.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/bekika.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/63176155539.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341e0c19988---45521815522.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/10555847544.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/podene.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/xuwozawezub.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/vamumafokuzif.pdfIn PDF document text
    • http://gojjang.com/uploads/files/39970361080.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/98602545508.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614194aacaefa---sagex.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/majajibejezotuto.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1630d0a49---sunukuxodese.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/27615110123.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/voxazapevurit.pdfIn PDF document text
    • http://101balkon.ru/upload/files/fodenolodofujivoteki.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/811248883.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/padufofometijeriweradota.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=wpa2+password+hack+apkPDF 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_off0000c676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC676 10432 bytes
SHA-256: e556102af9eb89acb1e8976d413496bbd653d16b76222c8631bc08e27b4be2dd
font_01_sfnt_off0000de62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE62 17984 bytes
SHA-256: 1831ef71eb1e3b774b597af63cb27e3ab1166c5eafa9de1242bc9691af9932d0
font_02_sfnt_off00010d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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