Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a5e683d663d94b5…

MALICIOUS

PDF

62.3 KB Created: 2021-09-19 16:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 442b8de8c55d7a670faf87e578130f15 SHA-1: 98ac31096718f2324964243f22b817d9ad12151e SHA-256: 9a5e683d663d94b56e9aa1c79b34b92fa1a3afc983a2f13a20bf3d1d80279575
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. The PDF also features a link farm pointing to multiple distinct hosts, some of which appear to be compromised WordPress sites, suggesting it is used for phishing or distributing further malicious content. The embedded JavaScript likely facilitates the malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9122

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.
  • 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
  • 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://ccadl.com/files/20210904122920.pdf In PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/161351f43aca62---10756636522.pdfIn PDF document text
    • http://i-tos.com/userData/board/file/97065502664.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/delokan.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109171820102696.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134c3f0490bc---33282705059.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/gnhsbpors6l74rbi5o67idf6q8/8454343907.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/wasuroxu.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/80023543624.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/jixumapokefabegumawevomok.pdfIn PDF document text
    • http://bfttacg.marketsearching.com/upload/files/kupolotewa.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/sopololakofajadekunuliru.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/govivududamakavawa.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/85827667456.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/vixovikanonisanewokebo.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139925965929---1535225046.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/lokovusuwesetisebefes.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/10555847544.pdfIn PDF document text
    • http://gapp.fr/medias/files/rujowidokorejev.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/kefulatefovejexub.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/65063342256.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-13/20210913211529362229.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/50479600286.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210911010223.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=org+2015+apkPDF 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_off0000dab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB0 16616 bytes
SHA-256: 06f1d5f5a9083a80364da0885936c8ddb2848b41a67694407b5e75bff462a068

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