Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4511ed2f9d7137b…

MALICIOUS

PDF

94.2 KB Created: 2021-07-30 11:06:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a87d51585edee31d59d9b58e2a3653e6 SHA-1: 3f10927c111dc115f2db8997dfca5c568c513429 SHA-256: b4511ed2f9d7137b1428cbc3f0a09c66e4c754ec8f9f82c92712c6ec20cd3b91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classification and ClamAV detection as a phishing trojan. It functions as a link farm, directing users to various compromised websites and disposable hosting domains, likely to facilitate phishing attacks or malware distribution. The presence of embedded URLs and the nature of the heuristics suggest an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://alliance-vietnam.com/upload/files/43562407955.pdf In PDF document text
    • http://kemenyseprosiklos.hu/upload/file/jekodebuxasitivovu.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/rinelo.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/55355593549.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/ea2324eb94822a1f3894e6b0dd341910/robixezuverilinutezunado.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa30e68f00---45411515519.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/jovadeloreta.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/c80f12b30b55262f6952f1e54850122b/62648158863.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/moximajovixotivopu.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/29436144141.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/e5bd81de06iniugknrfbtmk32p/lerojaruw.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021070215143385.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095cde70c9bc---fasezuvoteriso.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/2583d07fd6a46a42fe49772aced2196f/gonuxofeboni.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/dexer.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/kb7hiqu4l3cd0okaurj2eqe2h7/fanevusuvuvaxo.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/kodunirisexewadimamedone.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160882c737f201---wivumuge.pdfIn PDF document text
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/83136969708.pdfIn PDF document text
    • http://coronado1977.com/clients/54390/File/89125939320.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/2021621102564303.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/4489972082.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/60257619611.pdfIn PDF document text
    • http://fondationmonetoile.org/clients/0/0e/0ecfe6182781ff486fe5156d2e85c11d/File/pumisaturumeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=personal+income+and+expenditure+statement+template+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_off00010bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEC 16916 bytes
SHA-256: 77de7044800eb59c693a11fa315a3d6ef7ae5f380504a14cd6ce2d31f4688bf4
font_01_sfnt_off000137d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D3 11072 bytes
SHA-256: 63b6f2dd8fad1b93027dbaa09aaf93b3fcba794dd7de993a05c1d544895d6cb0
font_02_sfnt_off000151b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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