Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca49a919b5702040…

MALICIOUS

PDF

88.6 KB Created: 2021-09-11 23:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 11310eb7c90da6fe656ba4867d1a81d8 SHA-1: aab277e7332a19b91a3e0ea8d2217f9774ce6583 SHA-256: ca49a919b57020402361bd9c2666b0c8050d23a84e3d6a534785a6c5dee7b065
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains numerous embedded URLs, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users. The presence of these links and the PDF structure indicate an attempt to host malicious content or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc828a5eb6---vegusudejona.pdf In PDF document text
    • https://vanchuyenduongsat.vn/upload/files/32901703412.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/84376314958.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/64360020921.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a0d52a224---46831096656.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/boxoguv.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/wojowujemibefezeteruka.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/31706375591.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/38676264096.pdfIn PDF document text
    • http://haitrungkim.vn/uploads/userfiles/file/91076244481.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/vipexativegutoteb.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210905171207.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/ed2453446e8d20f18bd889253639c1ef/48250034376.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329b9657c2a---35464830162.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/160kd1n6cmv8h4a0p7rk68v0m7/zonedodesatolafed.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/52956597984.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/59311802300.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/43831336071.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/81511464205.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/57511267820.pdfIn PDF document text
    • https://beaszemin.com/files/21757817720.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/53748289051.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/degexifovabelotejato.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=ms+excel+basic+to+advanced+tutorial+pdfPDF 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_off0000f654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF654 17456 bytes
SHA-256: 351567bdb7a32c239d8239674342e4b309034ce640f8ff91416e1c8f085288cb
font_01_sfnt_off00012341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12341 11016 bytes
SHA-256: 05be5173c4ddbfef931c5e11009e7b1c182015d847d88f5c57e8483c1d95d18a
font_02_sfnt_off00013cd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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