Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ce2b98f9e68662…

MALICIOUS

PDF

59.5 KB Created: 2021-09-09 07:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e782b0eb5e53cf7d290079b58e5faa04 SHA-1: cb9ff69b23a0b4cbf85c2217111bff0219fd2de1 SHA-256: 81ce2b98f9e68662c961b29a8a653a16bf6f8a29b06df9c9b1da52d65b3a2c07
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high score strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8037

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://adtw1.com/ckfinder/userfiles/files/51179981602.pdf In PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133806c14bae---tuxifuginapudukulotuvif.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/06242eda4413fc27e1e2b815769c13db/kadakonomizuzidadub.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/74218627081.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/16753727709.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/jewekateli.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/zaketobu.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/fisufirewo.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/nipugofaxelasolomus.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/paguwumimaxul.pdfIn PDF document text
    • http://snft.ro/media/file/16369056931.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161363a2141854---rejugij.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/qap0tg5skcv7h42306kgdk50o4/tizimabun.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109020305271042.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/zadovirejaxaz.pdfIn PDF document text
    • https://costarica4d.com/contents/files/naganotukipudixusiv.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/92209602654.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/nagevoxanorel.pdfIn PDF document text
    • https://totounited.com/contents/files/titazudusej.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/vimuseviguraxilam.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613295284d752---juduxopog.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/bipinelimev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+unzip+subtitle+file+on+androidPDF 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_off0000d43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43E 10868 bytes
SHA-256: 2455f00aab2a527600fcc64d23d139fb6265bb0c48662098e06fd274554e12f5

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