Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eb19a126fd8e769…

MALICIOUS

PDF

91.1 KB Created: 2021-09-11 10:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 304691b58bd35437bae66b7a77660294 SHA-1: d5220ed28d7c975f4ea5cb7560f7101d6d8e83bf SHA-256: 8eb19a126fd8e7699b092568f18dab34b1c383c1b07f2020e67854bcda8a25b2
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to compromised CMS upload storage and disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. The embedded JavaScript likely facilitates the redirection or download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5753

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://innotek.vn/uploads/news_file/25735611277.pdf
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/xomegepaf.pdf
    • http://vecsecity.info/editor_up/badanexero.pdf
    • http://kenhuffbuilders.com/userfiles/file/fekupinofik.pdf
    • https://www.esfa.bg/root/ckfinder/userfiles/files/pomojebigakev.pdf
    • http://chinazzjx.com/d/files/49553179461.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613568c877993---javej.pdf
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/fesupizekuz.pdf
    • http://it-hair.com/userfiles/zipekobozo.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd2f134dbb---galexajuranisozaxo.pdf
    • http://moutierrozeille.fr/userfiles/file/fugovesufudiz.pdf
    • http://dierenwinkelindex.nl/images/uploads/20271877831.pdf
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/29746967767.pdf
    • http://everbeenmagnet.com/js/upfiles/files/ranonimepegit.pdf
    • http://iburgisidimarsala.eu/userfiles/files/faluraketarozefadoxunanet.pdf
    • https://sahodayabbsr.com/test/fckeditor/file/79189169918.pdf
    • http://aaykpn.com/uploads/editor/files/misiliwusukepav.pdf
    • http://perevodvnegiloifond.ru/pict/file/gidobepomesijomadokitodob.pdf
    • http://52fotki.ru/ckfinder/userfiles/files/82722681356.pdf
    • http://bradzo-ep.com/uploads/files/benobazazigoxemulesofaw.pdf
    • http://esistore.be/userfiles/file/68257400004.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/4e7625c498537aabc8dd0361a15e8a36/nufizilotomadivoxokax.pdf
    • https://ezokniga.com/uploads/file/78856130779.pdf
    • http://kyanite.tv/userfiles/file/18566028796.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=naruto+shippuden+ultimate+ninja+storm+4+download+for+android
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001262f.bin
34a7f117bd6747e6f72ef4b8068a46c293ff2b7ff71ab3630efe8c73e80f888a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1262F 22208 bytes

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