Malicious PDF — malware analysis report

Static analysis result for SHA-256 241ba6c54d0684ac…

MALICIOUS

PDF

121.9 KB Created: 2021-09-07 10:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5eb66a2449ee295e3488b7737a12e669 SHA-1: 02b6726053fd89c661b20ad893ab179088c9b7ce SHA-256: 241ba6c54d0684ac0fad7b5a35507d1a4565edb11e6f49bbde9fc6016d29acd9
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

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://4998horo.gmmwireless.com/contents/files/14022881076.pdf In PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8fd6865fd---motavulakixopogetokibidow.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/2f1a8d1c2ff83cafe9d3ef6340eac482/bajitibuzawomef.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/72693970720.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16082f132e544c---53335084753.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/612f2a1f41b8d.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/zuxobesulodinomo.pdfIn PDF document text
    • http://ibiforstarlight.org/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/xetawijufaluguzisupazax.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c51725e5b91---76351429929.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/71ca06f74aa04faf7feca106dffe0062/pedekali.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/kogekobuvisof.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f0f330acd---92676649421.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/gogasiluxekufepani.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/jidebufajudagirixubi.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/gadudiwar.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/db4eee0b8c7f7c0fdb925ae375e6e829/beguvofinimaxofosas.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/xunitodolewilipususavule.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210615_4CA6BA164DE7B68E.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/7df223f78f5c483182d0b847bfc5bedf/takalibokivakokererikok.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/66629927482.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=steno+notebook+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_off000171f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A08 10232 bytes
SHA-256: 1b061d314419673de816281ef5f1ccca21b6a52207e687ce2b17f155effe3b9e
font_02_sfnt_off0001a0ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0ED 21772 bytes
SHA-256: cf71a786ea8dac63c41397dff05439094458fd3a6c09d7f457fb5c021b400ac9

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