Malicious PDF — malware analysis report

Static analysis result for SHA-256 db21658e91e536ff…

MALICIOUS

PDF

99.7 KB Created: 2021-07-13 21:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: be752badd4626a90a6a15a57689b321c SHA-1: 5b05059fe3fd83d0ffe29175ae58b72d9f2d4dc1 SHA-256: db21658e91e536ffedc2221bceb3e42a533b513f01fc1ee4f71c075c97beea8e
164 Risk Score

Malware Insights

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

This PDF sample was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of malware. The presence of a visual download button and numerous links to compromised CMS upload storage suggest a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and linked URLs indicate an attempt to trick the user into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://arcadia1973reunion.com/clients/3/33/33cb7023d77084166ed027ca16b579b7/File/50530761216.pdf In PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/fa3cf4bf2f185e562e212057ccd5f34d/tamijofijizuturut.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cadb5626fa5---69065304951.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/13677148451.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/100f8568044c89d7e2b1c0291e58c7bf/lafomebuzevekewago.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/l6n1k6pa36aalfdq0i8coqrsd5/zozuzadekotegogazapolobix.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/l9v7t8i3kns1j1ea9olb3bn7b3/pexibipabogurimog.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607507beb130a---fubam.pdfIn PDF document text
    • http://euro-ex.com/movijub.pdfIn PDF document text
    • https://chaplains-camps.org/upload_picture/file/puzenenakafuvip.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/sjnseld87i26j2sek5mrdn2u90/83638025282.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14734508933.pdfIn PDF document text
    • http://integrotech.com/zdjecia/file/mesekonudowub.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2a4be9268---petap.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b787436545d---8146685039.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cd557249b---65561562075.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/takusuvureroze.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae0b97d863---89795599090.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/81783333051.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/49144646989.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/rogisevupuvasibot.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/pezap.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/74330950a8ce560e9ef0ccf4ed89b457/4001954677.pdfIn PDF document text
    • http://viajesalaos.com/webroot/img/files/mifevagudetuxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=inspirational+books+pdf+free+downloadPDF 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_off00012195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12195 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000139ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139AC 10760 bytes
SHA-256: f2ca5b994dcf39bbe0a6b75c4408eb538a6893c2fa74db6db04ed85c4f8f7e8e
font_02_sfnt_off00015260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15260 17824 bytes
SHA-256: 2596465d9e1a9ede120c077d320ec5174f3b45b294c1b588d1a8cd75bbc49145

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