Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f4bf680120cfbe9…

MALICIOUS

PDF

62.4 KB Created: 2021-09-25 04:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8ac3720acf6e6e14a7963c5371b84403 SHA-1: 85ed528fdbaa45400fc24a99af7f1d62ba1817d9 SHA-256: 8f4bf680120cfbe9b74312b0fe309787579bc6e6c628146011c88558bb121ecb
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5920

Heuristics 5

  • 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.
  • 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://fullgame.hu/uploads/files/larepurexasosix.pdf In PDF document text
    • http://groupelamiri.com/uploads/FCK_files/file/65004242014.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/25473492829.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/lojopoxujoj.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1614561a708a94---40413790062.pdfIn PDF document text
    • http://gibisch.biz/files/files/pikujasazari.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///87539533609.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/dinuvuxik.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/ce72d9913218ac5ec47b07293dce3ba9/xinejowexidupozunid.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/fomifupi.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/bexegemob.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021091004030973499.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/83792180745.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/porenexebog.pdfIn PDF document text
    • http://aromacosmetics.bg/assets/userfiles/file/doxud.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413844b8290---fenulokuminasogodu.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/molebagisozo.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/211276f0905210ea7b8a605e38ac63eb/68203327988.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210917_37C0836FC15D5F4D.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/desuvebure.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/baputabomonunetodufememu.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/48a49e8102f26f38d24b9f56737547d5/50931566761.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=excel+to+pdf+pdf2onlinePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000adcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADCF 15120 bytes
SHA-256: 65a33bb7468addb0c08447021e2eb555cd8b4dee5987976be5d86f56d7287423
font_01_sfnt_off0000d380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD380 10388 bytes
SHA-256: 52dd49067418d012cfc7f57c676f4c3d1e181c86d21e27e74e4decda8acf28e8

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