Malicious PDF — malware analysis report

Static analysis result for SHA-256 16d77cb810d91234…

MALICIOUS

PDF

91.2 KB Created: 2021-06-23 09:29:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 037a47409354a58ac47c42e00cfd74f4 SHA-1: 992edefcfdac75116a7241543589ab96da293ea1 SHA-256: 16d77cb810d91234c74b7bb4753b6a24f8b7bb2c7f2e26053baab6161e89c6b5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6606

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 https://inwebjor.ru/uplcv?utm_term=bade+bhai+sahab+class+10+mcq+test PDF link annotation
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086417c6be28---lewinivuxi.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/5075313bfbf0c0466d3ec839c3709070/43409299429.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f9ed26d80---bipulamuxevujirabe.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160902d8af24e8---40888402339.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/40766967718.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609aab3372759---64390143839.pdfIn PDF document text
    • http://sns.hu/_user/file/zifunigupaviba.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/fipubatawaxetom.pdfIn PDF document text
    • https://prastosten.se/anvandarbilder/95/files/17137863204.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/fbbf76bc9eae8a48b433c44d609b3359/3630675870.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bc812474b87---50950687149.pdfIn PDF document text
    • http://hasyo.net/files/file/77711037205.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/ravowijutotawafoj.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a4d40513e---vonupiguwajawadukewo.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/7aa4ad46f422d6dd29840c7dcef20ad3/zatatoviremijosolo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB2 5592 bytes
SHA-256: c24c1b1fffd15fcebf7bd6643f3538371e925741a326c17c2b8039af2ffa83b2
font_01_sfnt_off00013e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E8C 3720 bytes
SHA-256: 6539b129c5cd894636dc8f40f53a156c00c8f46378ab4f137c96d687a1cff6ed
font_02_sfnt_off000149ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149EF 10628 bytes
SHA-256: e0489bacdfc385720f6c2f900ab9a0703b8b42fa7c9628b202cee87de89e1cf8

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