Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f515b8ea5b352e9…

MALICIOUS

PDF

80.3 KB Created: 2021-09-07 20:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 348a3878338531afcff1f09d16351f89 SHA-1: ca58e2ddf7b13348da9e093698260c892d4b967b SHA-256: 2f515b8ea5b352e92bcb0e1be8deb6c319de469bc735b38980d0b9203f65eeaa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://eg-connect.com/uploads/editorfiles/file///zezazujevivopakiw.pdf In PDF document text
    • https://98ing.com/upload/ck/files/20210803_144145.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16083ecb2a4e16---liwamut.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/8327838184.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a567728abbf---suxufeguliwijawokimejite.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/56316910174.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/bofuwag.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/febizokozibapi.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c25aa49233e---konokiruwokifega.pdfIn PDF document text
    • http://staples1981.com/clients/b/ba/ba027a536d51c1d997ee76cae6dc9017/File/12396210271.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/39564896789.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bde628e0954---5076110965.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/14011020609.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/bijegitepiwor.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/fesovabitos.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a188ee1679f---92377032409.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99e995104---buwozuta.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/99037073338.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/31274627900.pdfIn PDF document text
    • https://0900107678.com/upload/file/77802259886.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/52768739772.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609894cf8f54f---66114762281.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8909920c5---25768769832.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210506003700145.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/f885716166603a17925832069fb4f393/safidoxedonenunebi.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/dcfb4f6fe5343928cc1fde3432072e6f/vopivonawelolasafomepa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=bin+card+and+stock+card+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_off0000d6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E7 17348 bytes
SHA-256: e6e04ba4ae904950d6df1a16711c216865f946ffdf3ea2d3a99154d6b7f3ebf7
font_01_sfnt_off00010382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10382 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B99 10580 bytes
SHA-256: 02c8fa44ad054824664e194577393f6783d6ca5786fb13740eaa5066b8c6b411

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