Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c198511379fd02…

MALICIOUS

PDF

57.0 KB Created: 2021-06-20 19:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: face30e12d5431e296d5e3dadb09b86c SHA-1: 56b6360edbb4c511ef6fa50b7742da869328aafc SHA-256: b6c198511379fd02b4950a8eb76ed3fa9a4442bec877aac04ca64dc496b2baaa
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It functions as a link farm, presenting numerous URLs that lead to external sites, some of which are hosted on compromised WordPress upload directories. The embedded document body text appears to be corrupted or obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8253

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://archism.ru/uplcv?utm_term=annabelle+dual+audio+download PDF link annotation
    • https://vmwarts.com/ecovic/file/mufifoxev.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/5fd4bb7bee1977816d02c89ec3e05456/19716830.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b1d83be66---wasogixuv.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/17e1db1430f89b62e9a2758feae9651c/93861002144.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16230449776622.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/28800470917.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/7f038c2bbb604b034a703eb61feb48cd/lefulovuf.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/akuzaniz.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c1dd24d11---fepazizezik.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b62f68479---46928367510.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4747dfd13---rizamufopelabikig.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160982e2aadb1d---86003668480.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/0f45fd0d13f9d0799ed17c554f4d6d35/taxaruw.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/40fgelo6fju4pmsjl0a9i0iq7g/fuzagilesobujur.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607223c0aace5---50945405935.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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFCF 4764 bytes
SHA-256: 8097ad14c3580d52737a11b0fcb9f1703935cd072a5a3aeba0c53b9fc50bfaea

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