Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d44b91fc20c4c3c…

MALICIOUS

PDF

74.8 KB Created: 2021-09-04 07:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 57ab5bd7222a8c4c65ba6baf0b4c4aa5 SHA-1: 7ecfb3c2ac7a237a4ab693e4e1a41607014e5629 SHA-256: 9d44b91fc20c4c3cd448534e18fa89126f980cb26d7b1cd4ac540fbd147228d2
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate this is likely a link farm for SEO manipulation or to distribute further malicious content. No scripts were extracted, but the structure suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7633

Heuristics 4

  • 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://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/83oa727rfqurld9p7c22nkh9ua/85826301940.pdf In PDF document text
    • http://klpa.net/userData/board/file/54814303348.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160728966b79d0---zivip.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/kifiwijowumilezedof.pdfIn PDF document text
    • http://medi-sen.com/files/files/26784489477.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6c8409108---kunisuneb.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075539f3f5cb---xezerira.pdfIn PDF document text
    • http://sxsasa.org/images_fck/file/1628768920.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/cf619cf5384708419450b7efff6a1b31/mizixavidipa.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/kisumozaralejoxogala.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/drqlrj391catmgkjtrlgtp72u6/13947632728.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210819185310.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6bc37766f---30121589501.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/d00e944428448b8b3a6d2c1754795d5e/palufisoselojenis.pdfIn PDF document text
    • http://hopkinshigh1988.com/clients/75739/File/7328740064.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/vodemogagozupemabime.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083cd6483461---kixegenanozemuleniru.pdfIn PDF document text
    • http://195exim.com/datas/files/20108410879.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1126418e1---53062203600.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/dekofifumet.pdfIn PDF document text
    • http://jar-ted.pl/file/91428393784.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/7774902120.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/9q44nn1o5p9r4tvad3ci78kjk4/wejamilu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=rapidex+english+speaking+course+pdf+urdu+book+free+downloadPDF 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_off0000ea96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA96 18308 bytes
SHA-256: 6a6f31a9aae0f256513c54ed974d4748bafc62c5bc3a8c6dfb4607cdf1f09c62

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