Malicious PDF — malware analysis report

Static analysis result for SHA-256 5610153f17dc00d7…

MALICIOUS

PDF

81.5 KB Created: 2021-09-03 00:05:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f97eff974ba320a9e1eb95bc0c6572bb SHA-1: 964844d10a42a751a169de68677e4fe0331ef660 SHA-256: 5610153f17dc00d7ce261011314f3122401f1283db24012360eb5890685cb62f
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or are part of link farms. Heuristics indicate that this PDF is designed to act as a link farm, potentially leading users to phishing sites or malware downloads. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://ex2010.com/uploadfile/file/2021080114115773499.pdf In PDF document text
    • https://walkandsmile.com/userfiles/file/4589344762.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a20fb6c6c---85747879870.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/movoloviba.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/88585837731.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39715866bf---22646401113.pdfIn PDF document text
    • https://ewt.cz/res/file/67041512216.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/84502429648.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/88latrerup05gjtig1glm0d5dn/77247367170.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/7b3fbb983da8762db9fe76c28e3c85af/16565098929.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/14798436763.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/mawiriwekuriku.pdfIn PDF document text
    • https://pmms-online.com/assets/file/katenajuxodelapeg.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/7906989534.pdfIn PDF document text
    • https://ayurmitra.com/files/file/josaki.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210828_284CB59A228CE57B.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16094117872c73---benelib.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/vs59u706tcj8gpbs839ci6unm2/86222488445.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe94698c8c---76824091536.pdfIn PDF document text
    • http://shepardfarm.com/clients/877021/File/fafuwefosojobuzedoko.pdfIn PDF document text
    • http://one9five.com/userfiles/files/xojuzoxob.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/rusalupo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=kronik+hepatit+c+tedavisi+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_off0000d916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD916 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12D 10820 bytes
SHA-256: 247965eace5441fed978b9fa50abe55fa5e5a11d08c8719987fde03899a690a8
font_02_sfnt_off00010a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1B 18872 bytes
SHA-256: f23fb54a7daf1882f114fe045397300b0cc1489b1bfe6360f31b9bd51ea35081

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