Malicious PDF — malware analysis report

Static analysis result for SHA-256 d723bf4012f94519…

MALICIOUS

PDF

89.6 KB Created: 2021-09-15 17:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d3ff985594fff88c9bdb8d2fc514116a SHA-1: 5fdc4f3fe2edeec1a805a963adef7ce943228f08 SHA-256: d723bf4012f94519d39f81f939d1e9e4b6c718e3ead0e6bf9a3e9001fcfacd47
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that point to compromised websites and link farms, suggesting an attempt to redirect users to malicious content. The presence of these link farms and compromised CMS uploads indicates a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.ktgroup.co.uk/ckfinder/userfiles/files/46377182654.pdf In PDF document text
    • http://boatmonies.com/uploads/files/judasi.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/35312570640.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/17629902006.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/9a0c459f5fc12da252499578ad25ebe3/kopifategudag.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/xiloromuxifotaf.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210905011148.pdfIn PDF document text
    • http://lblussana.it/images/file/devumenipi.pdfIn PDF document text
    • http://hasyo.net/files/file/gafogibir.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/25567117864.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/95633233870.pdfIn PDF document text
    • https://inarsindbari.org/uploads/wobenat.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/15797815109.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/de9tjuulbe0f0v8cb7jp05g2m3/pedekokipisarewoni.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/vonoxel.pdfIn PDF document text
    • https://insp.biz/img/file/toramam.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/91907596051.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7a10ba6b9---lupizadexozaro.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/fetilosoferapilo.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109140558494628.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/73887138202.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/9129606462.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/lijekukopezonufe.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/75087419320.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=watch+the+wire+online+free+putlockerPDF 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_off0000f779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF779 18208 bytes
SHA-256: 931104cb09162413f0f8b1f29bad6a58a2ff71df37b29fb969d54c88fe7f3d6d
font_01_sfnt_off000126d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013eef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EEF 10680 bytes
SHA-256: a345151512bd4b95c4ae2cb4bcae6be04b30ccf8cea2e99346d271f0a6f00ea6

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