Malicious PDF — malware analysis report

Static analysis result for SHA-256 669b76ae52a6d1af…

MALICIOUS

PDF

193.2 KB Created: 2021-08-02 16:26:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ad2caf0c930f5ee13d49a2558ff96ccf SHA-1: 271f7e3e01a588de7e147495afaa6dd3e68a8e08 SHA-256: 669b76ae52a6d1af6ade9bce85659be18177ea00aaadb4cc579b91c72cdd9f52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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.
  • 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://dinskayarealty.ru/media/file/pafajobikajibukogopepuni.pdf In PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca4264988e---xuvukanativazil.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/61406291615.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/pujurux.pdfIn PDF document text
    • http://adveotec.com/img/file/58303149965.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/11602215984.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/91493880249.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/rataguxovik.pdfIn PDF document text
    • https://mihalex.by/files/files/labuwapekuxudumoruzud.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/pafufig.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/27cf104624604488774e5f4067b185f2/47662546224.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e5d5d55a8---90865964823.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/ctr4b05nagc2bpmd4g5eq1eedj/76652741898.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/e031a1f5287f06d8abf88a0efb4fa120/83055080073.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/5vtl1kllmb90mp3ilb2sa7438t/vijatumatilukivo.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16088d1d89a827---91867943003.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/21191444756.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/daxenag.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d7e717817---79589367346.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/4b426be4adfd1ade7577bdbfee506c77/67152177072.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/lixoxadasipelikebijosulo.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mawokekibozujolapotane.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=rap+yapma+program%C4%B1+mobilPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002723f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2723F 24460 bytes
SHA-256: 3cd4457c05236f73dc8677a18759963453fb6a24c5be119dd411911ee1efc9c4
font_01_sfnt_off0002acc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2ACC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002c4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C4DF 10440 bytes
SHA-256: 2eccc5004c183acc098a08439fcc29f2a16fafa31f42425c42e2f35e2daa7a81
font_03_sfnt_off0002dc2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DC2E 16928 bytes
SHA-256: f85b58f09311786573d309329ab3dc942a17783161326da6174de9e6b7509e1a

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