Malicious PDF — malware analysis report

Static analysis result for SHA-256 70971d4cfa3116f2…

MALICIOUS

PDF

63.6 KB Created: 2021-06-03 10:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 248c237dde35084ef87315df0854bc10 SHA-1: 3926d209dd841738647f66dc42ab669a8bec9e79 SHA-256: 70971d4cfa3116f22e8fd661e6c3276ee92123a7a67f283898a71db7bb348ae4
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 high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, characteristic of a link farm used for phishing or malware distribution. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9745

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://chcial.ru/uplcv?utm_term=ejemplo+de+una+fermentaci%25C3%25B3n+alcoh%25C3%25B3lica PDF link annotation
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609bbc48d4717---rupojofujilexuwo.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/ffd025d146dcee1f81a7599d26cac46b/redadasalixiwo.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ade8ab7314f---leropatisirapasa.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/6d9de8ed100c18c7de911531e8365337/miwiregewojepezubufejedos.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/87b9993a9f4f14e3a9d0f7be7e485587/xilosal.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-1/20210501150920212908.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/jedivev.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/7d459f6e424fea8950e5db53ec17d7ba/84566000762.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6o00qmi2tj20p4u3jpbar2o093/wizurog.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/cbb3c278f5f3674136d8c50c6d1a2ced/xukizowigasovabudala.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/936a19a6055c51270b2adeb27dfc6a03/12898981770.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca549168e7---wevivopu.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4772a410a---kabatopegedapivob.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/32b1a9c144bf786791318152b0af733b/83980002166.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/102eba3f684ba9ebd294f42ae5612a9e/vegaxozorafo.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_off0000d3ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EF 5384 bytes
SHA-256: 22b63efd40d6df4a5e429972437729ef43caaab89cea73ecd483df080ff3fef9

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