Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba15510e59759a82…

MALICIOUS

PDF

54.6 KB Created: 2021-09-24 21:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6e146f731a24b59bb0e44761368912c5 SHA-1: db20180aeab094392886fa2da395709659dc7ffa SHA-256: ba15510e59759a8244c0dc27aa755c32fbad3cc0ab3c242fb73d20c4cc0f1f4d
174 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains an image-only interface designed to trick users into clicking a link, which directs to a PDF hosted on compromised WordPress infrastructure. The presence of numerous external links, many pointing to disposable or compromised domains, further supports its use in a link farm or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8936

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 54 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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
  • 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 https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/mifudilajixuzasegofop.pdf In PDF document text
    • http://hoachattn.com/image/files/97012298529.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/99493120008.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/30175379280.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/18640264805.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/domet.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210916051922.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/30772518719.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rameje.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/gevikedavewosizi.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/30d2ba54d731f0e42737e5e1681d8f4c/93284455322.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/nomimiwuveriw.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/ziwodefujolafu.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/19pffmso495ni09dplmsetucj5/mogadidorasafudizoganex.pdfIn PDF document text
    • http://tctrack.vn/images/newtech/files/86721827261.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/57327290981.pdfIn PDF document text
    • http://zhongyuemedia.com/filespath/files/20210919000100.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec40190286---libukidenazemezu.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/5807f9e83b0768bbab19b3fcc10d3826/20291574225.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/62682541193.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/ferh490tb2el8btke0lv81rns4/31604804553.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=multi+word+verbs+list+with+meaningPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF3F 13928 bytes
SHA-256: 755c0b7caa9965aabc12b084a3cd70f58d65377da326a4098d9a5883282dda40

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