Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cf7aee34f390e1e…

MALICIOUS

PDF

78.9 KB Created: 2021-09-04 00:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 51e9d4ffbe0269f919e57b6e64c598fb SHA-1: 541110626558db19ebc7a08a11f0cd4128ce8236 SHA-256: 0cf7aee34f390e1e8eb7bccc702e2331d57690d863d1476d06701a545a4d1a24
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload directories and disposable hosting. This suggests the document is designed to redirect users to potentially harmful sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6061

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/dazonowukorofitu.pdf In PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/97f9faaf1db7df6b1fa0072dc22a627c/depesugexeledifavapazumak.pdfIn PDF document text
    • http://gibisch.biz/files/files/teditalod.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210903123322_mor45t.pdfIn PDF document text
    • http://hopkim.vn/upload/files/lazipalawozofu.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/wimipuwona.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/16279084710.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/vobujalumuxomuri.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/42287973200.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160709caeba37b---40471880636.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/nolunidoj.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/5239428868.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f8dcd4395f4---vokabosikaka.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wuguj.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/e5f82c5debbbeb6772154653e66748b5/46276461169.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609550678c4e2---potisevepowuwabila.pdfIn PDF document text
    • https://mimpishiosatu.com/contents//files/57886401580.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/7534614399.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/thham4qp0cravul3t5q8j724q7/56071305197.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/c4f8630e9b341f6a1de96ce1012cc735/18910572526.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/48590425476.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/57662824528.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=compress+file+pdf+menjadi+sangat+kecilPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC54 11216 bytes
SHA-256: 7f033a3a97d52ad70fa3f14e159a98b066457c5a65bea34291bbe0e737037d38
font_01_sfnt_off0000f660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF660 18008 bytes
SHA-256: 8573f1565e3dce6ec300dffb9aa0cb3c7a2419d921eb9724fe9d45c876952e9b
font_02_sfnt_off000124d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.