Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dc3bbe8362157d3…

MALICIOUS

PDF

89.4 KB Created: 2021-07-07 01:59:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 894a08ce1b1d442de3815ba3bc7658a7 SHA-1: 0147901173054c2e1425961ff5d0ca4b9938d629 SHA-256: 8dc3bbe8362157d325839c369f4e07c2af7fa20516450c2991f29a07d23a08b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content. The document body is heavily obfuscated and unreadable, providing no further context on its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/f668d6f0f40cf1bd1e6935abc3d3eaec/96010515841.pdf In PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20216394478123.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/d0a7fd3d8f08cb19dcc263d6e23b9c5a/gibuviwepalesasuboja.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/nonekexituloxi.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/pebivigamijojuveref.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/9777f4e44985c71de4e3b706651542ce/worevasulufatejejomo.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/tasajodidij.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/85598494285.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1624130840.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bd79fb2e3f0---jasigomodima.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/13512732312.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/1139663148.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/xenebemeburiw.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/zokedudalanuruzeti.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/f484d664d659de5bbcb8c897f89ee5de/foxigamom.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/c00e1c587f6c14577064a22f847ba85d/63129449172.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/nivujabazidug.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/tadotalopapakugigogesebo.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609457ad402c7---fovijajurogiwutibofewe.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/pizububuvu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=words+that+start+in+mPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/58392938026.pdfIn PDF document text
    • 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_off0000fb7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7F 10328 bytes
SHA-256: ef79b00143adfa535b7809d246a5eccb1170390429f49c9637383e930f743a13
font_01_sfnt_off00011293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11293 17492 bytes
SHA-256: 4a16530ad073f5b06d28778e5ac7074d237a942232b1766718154ed8dc21aecf
font_02_sfnt_off000140a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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