Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a1baf1b1d20c9a…

MALICIOUS

PDF

86.0 KB Created: 2021-08-07 00:30:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 68709361a7401ea691d7384a93038747 SHA-1: adf0959b55fb260ddd6a8b0bdc75374833cf2f9b SHA-256: 25a1baf1b1d20c9a0f79af21bc775a5a51daaa1f5844e56cd852e81e4ec1f9d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous external links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content. No scripts were extracted, but the presence of numerous URLs indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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
  • 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://chieusangducphat.com/uploads/userfiles/file/wagenegilinoxol.pdf In PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/b2tjc51a6cra15q12lbd6ft3ld/17642901851.pdfIn PDF document text
    • http://austintownfitch1980.com/clients/879833/File/18140285209.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/94920433253.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/58e25b18cb8c2c031ec7c1285a8a2b41/70208100540.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609908f43ed73---tevuxikizevuwovuranetijux.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5012f3b2a---70196967412.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b74a0e227a---18630827677.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16096001f4d23e---zajafufidovurorodoxurelak.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/47912203872.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/42223208214.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/3624b63dabe6b162a5e80642d69a7e1c/44867799537.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/kugakopitibusasez.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/fofadavinefovowizus.pdfIn PDF document text
    • http://www.christianhouseshare.com.au/ckfinder/userfiles/files/gufijoxakejirisemarada.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/nilutesepapefepu.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/hhqu1en5glpbrtvqukr3ptg546/talurojagejuterabulixava.pdfIn PDF document text
    • http://hotelsandmartin.cz/files/file/xunewofenotamoziwonagojig.pdfIn PDF document text
    • http://adainst.com/uploade/files/20210704174319.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/q9rbv2n3l7bbd9p4ketu54oig5/13485581711.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/lunifidexusurafabidi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=descargar+minecraft+launcher+fenix+mediaf%C4%B1rePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22D 11052 bytes
SHA-256: 68477e88bab8d26b5f30a298068d1abd2ece895f1bc4adebfa84500434eae1d0
font_01_sfnt_off0000eb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10390 17688 bytes
SHA-256: f435a7b2bedfb5598b0ee08b129409e16027391adccb653872a7b0f9bcabe6c5
font_03_sfnt_off0001305a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1305A 16376 bytes
SHA-256: 0c133022d1e9883d2ff7035cf84f1fa0be9cfa0d671266bc5a940283bc0f9855

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