Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6e7b0a199d81053…

MALICIOUS

PDF

74.1 KB Created: 2021-08-30 03:38:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6f71c4c0e9974fa581f5852839d3ef05 SHA-1: 4911ae46cb143159ee288c1a49589a788820cf1e SHA-256: a6e7b0a199d81053fa68c49a64985296278ba0085da6a615e208bc8c0cd0d047
154 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to distribute further malicious content. The primary attack pattern involves luring users to these compromised sites to download additional malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9671

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://fobas.cz/userfiles/file/muvewa.pdf In PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/fufunevoge.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210523032949.pdfIn PDF document text
    • http://taiyoaquris.cn/upload/userfiles/files/20210601211613.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/f4daf086620c3e6e452cb12348cf272d/zumakaxuwuxoju.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/68504463484.pdfIn PDF document text
    • http://clingac.com/d/files/vuzajakilufevosuxixuwa.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe935176da---vojuxe.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0bd1126ad---lobesezowe.pdfIn PDF document text
    • http://muszempilla.com/files/file/tetamimorevi.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/15465865140.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e4aad0bed---dexipatogute.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/87647564141.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160be768cd6fce---86290417034.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160744496c2e4c---38581617162.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/99254289895.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecac2f17f0---memijetajoniwupuzo.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/61986633096.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e05d7861ba4---lowigebelatakurojokeke.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/a7222f32f0ffb11be3b003271f1f66b0/tofexagozubalerujakoli.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/92293091994.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f8a62c728---rolifuzubibijexebigusovid.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1c5d537bd---sexoloxezej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=hepatology+a+clinical+textbookPDF 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_off0000fa0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0E 10720 bytes
SHA-256: b2f49d7ce14a33064ae8cde4332252fc812592ce5080f05e2d5990b489407331

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