Malicious PDF — malware analysis report

Static analysis result for SHA-256 3072772fe73e79b2…

MALICIOUS

PDF

78.1 KB Created: 2021-07-02 15:54:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1f3ebef429b8661f0d4903487448a0b9 SHA-1: 0218c9a172fb64ae10db925c2910e9b538a8d154 SHA-256: 3072772fe73e79b219b7ff5c62969909aec9d6eff83111d367609f19edcb1173
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised CMS uploads or disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead users to further malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://thementalhealthadvocates.org/files/userfiles/file/bisejigobejegokugexilux.pdf In PDF document text
    • http://robertsrucker.com/clients/7/7f/7f5ecd1287ec2152c36a7dc1808edcbf/File/dekakoxuxifeginugisizedar.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/99222680661.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/89318278266.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607781d2eaa14---87017509152.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/38bcc72856bd1eff1b6a03221e7e43ed/25860230055.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/59934277053.pdfIn PDF document text
    • https://topplene.com/upload/ckfinder_temp/files/20210702190051.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bba1bf1ac7---25528415675.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c77f06df6c3---67050271097.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/zexigofukason.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/27186970799.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/vfgkh4btsf971iklb81k5pcnn5/dodiredebaxanuta.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b3588e16902---metezufusidufi.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/9d8cfbc519327a27353ad1023471b6f0/48662991578.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/30776211238.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/merukevezaralu.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/79815532809.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/904642c55c54d2898709d66770c27a59/7625746589.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/85665016640.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/41l1pvs4qd4tk2nc7btclp8p82/52551082325.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbeac27a5d---45580089558.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/1715255068.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/70378625701.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/r0mt60uc4jsceuhd3af5cponu0/xopisijepokufaxora.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=clarence+lil+buddyPDF 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_off0000ce43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE43 10364 bytes
SHA-256: 451a2debd8fa44f58f8850b3c55779b08235dbb55fe12afa5c09fc4f11b25bf0
font_01_sfnt_off0000e5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCC 18372 bytes
SHA-256: a4b83918af40f8570bb66f5078151d9da2295d826580b9b9a67147228fd7fb5b