Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d0b7129d87cc064…

MALICIOUS

PDF

73.1 KB Created: 2021-09-01 11:30:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e56c5d989a5a1411ed7a29000088265f SHA-1: 97eca05096ccb36b817e1e069078d289a3c49a04 SHA-256: 6d0b7129d87cc06485fa81e035134bb5919c871da4a36d19aca74599614b7b4c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, a common tactic in tech support scams or callback phishing. While no scripts were directly extracted, the PDF structure and URL patterns are indicative of a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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 http://mnogonomerov.ru/uploads/file/33599048062.pdf In PDF document text
    • http://fouladsazanco.com/Upload/file/monivilalewukoxijezufipuk.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/niwasubaro.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/senabu.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/jlv8ui1mv5uodagj49sjuoriv0/lugul.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0530/b56b6bfe65318126bedabae2d6de1bfc.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d307af280---77748539978.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/v402vti51ld9iha2f4eucb84lc/wijewubaxatomebuv.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210710_8FDB386D7583A476.pdfIn PDF document text
    • http://regmac.net/userfiles/files/30986442906.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/4e972698b9c0758a2871cf8f1700ff9a/bovorodapibufof.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/f81b93dfc8c8695cc42148b3ec749c84/bifojufanuwe.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/l40obkg2v3gi99781vi97hg796/30640421316.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/14488150208.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf9df9397c0---wigajivaloninikile.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8c8400b02---dagokon.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/g6kfgjv0n3cb9uu99rrb2ik6bo/xomesibuxa.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/57824658260.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/c83c8b744513b9b75b88def98a19d9b6/64831686654.pdfIn PDF document text
    • http://hccc252.ca/clients/e/e4/e484b38507f190a955b66748903449e1/File/58688243782.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e8f0ba0e01e---basenudunekud.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/vikexukipifafodo.pdfIn PDF document text
    • https://faprosid.com/file/rumeto.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/79526517663.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=4k+video+player+apk+for+android+tvPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB973 17440 bytes
SHA-256: 2befd2d99c52ae9f2eac6b1366e5a9bd82b711aaa6bab2298a56a576231abc71
font_01_sfnt_off0000e66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE82 10576 bytes
SHA-256: 71c5fe98c9da31be08af51536c05436b4ba261f75ce3ab8c7399a8818a02d69d

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