Malicious PDF — malware analysis report

Static analysis result for SHA-256 b88a77031269981c…

MALICIOUS

PDF

63.8 KB Created: 2021-05-28 21:09:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: eb6bcde921869ddb98d90169242d7a15 SHA-1: 647ce7b1974c16d57fb57a15661d1bd41eba1650 SHA-256: b88a77031269981c63d83cb78affcbfd93c622f012006a7553b69c29de56a1d0
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous links, many pointing to compromised WordPress uploads, suggesting it's part of a link farm designed to distribute malicious content. The document body, though heavily obfuscated, contains text related to downloading a PDF, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8425

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://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/96b59294a5a7475f363d5a586cf57244/xogerixijugobavara.pdf In PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607503e3a1615---domesaviwapupedav.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/9bcf71efde3e51b2a627392397cb7b80/61378014333.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac42259ada3---najedejaziferavigebosomof.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cccd36eb39---7352789718.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050207503273499.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16079a946e8de7---xulekugoxiziludetupuli.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607248f938fd8---37065160898.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/logajafavelulisugevewez.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/c990f29b1511544ab783287188013af4/kuwimofonigafowir.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/t622aaisnkp8bd4aa4mj439o8p/guwabatimevome.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160842222857ba---29956771396.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4ca3d62d4---mopuvugovuzenisiresu.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/sokaguriri.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847920ebb9b---65753827528.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/89076341619.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=el+cantar+de+los+nibelungos+pdf+descargar+gratisPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07C 5300 bytes
SHA-256: 8d3471924fa26084d3ed39b4a219aed37480a601b425748de6df8cd722551ddd

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