Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad68c6676da70ff0…

MALICIOUS

PDF

59.4 KB Created: 2021-09-19 23:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7ed11516c6fd86b4b8645db8d66a9e89 SHA-1: 70baa9139071def043e4a78ae35e14943fb6bbfa SHA-256: ad68c6676da70ff0c9c7a1d798bfb672892cafacc50ea3fc58110df129f94ee9
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external links, with several pointing to compromised WordPress upload directories and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript stream suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7265

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 https://pistant.ru/uplcv?utm_term=boku+no+hero+academia+season+3+episode+1+gogoanime PDF link annotation
    • http://ankamet.com/userfiles/file/tenazobivug.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/97361661499.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161323f31bebde---21540575594.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/nixunulebojitemez.pdfIn PDF document text
    • https://vocembalo.ch/userfiles/file/19651813482.pdfIn PDF document text
    • http://polipack.ru/content/file/25225043156.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/35628636488.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/domipuwojuzoliporujeje.pdfIn PDF document text
    • https://unaizahic.com/Files/files/komoridimobovovuturilox.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/63401802056.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/90420195636.pdfIn PDF document text
    • https://ptogel2.com/contents/files/25703298503.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161459c63c21dd---99070650365.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/tefawepodev.pdfIn PDF document text
    • http://mtt-association.fr/upload/file/6999468781.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/lunibidoxubu.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/wibuxisisejikaziji.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/momudigavetif.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137e34772cd6---99722546318.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/xadugowe.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202109122017377800.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/74365727112.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/judusami.pdfIn PDF document text
    • 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_off0000be19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE19 11288 bytes
SHA-256: 0dee0f1251b40670164474b25f5965dd7e82bf733623a34361e1a013e7bb52c1

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