Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fa71238bb3159a3…

MALICIOUS

PDF

89.1 KB Created: 2021-06-29 01:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 29b22d7eb250d8f716fc486e3ff3f499 SHA-1: 8ace5ebebd410ef814a82b7e205cb05ec3e19dbf SHA-256: 8fa71238bb3159a3a145ac7f8b172fb57dd65123ef10c15f7ec35af5437f9670
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The presence of embedded URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://crysiq.ru/uplcv?utm_term=one+arm+pull+up+training+program PDF link annotation
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a4187fa87d2---damatomobiromokuzites.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/funefesovarevelabufedonap.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/q49sriu6ut78dklnk9p6pqjsa2/75843693455.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/wulupep.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/tumexaxopanuzemivesexa.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/vunipogefefiwomuru.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/suzopegepava.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/legolsnt003firdmlupu7eu5uj/39727092331.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/ruzarima.pdfIn PDF document text
    • https://ilmercatinosottocasa.com/file/1493189864.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/1d7mvo8onkt0r7pru9dtbf02m0/gonizoritefovifugijexiwaf.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882ceb949d5---88693697714.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/4d78ab093370620b5157202d3fce6dd2/perolaxabesedukorijawo.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/32688410742.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/gdrp6i6lodsjk87p4pntfvo97a/bekivosudelaj.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d88062888b8---wolitevaxaxopifaxafe.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a99102dbb6---rudavi.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/78584933959.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b099053097---sagalutep.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/41926430081.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/28966183874.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/85606451094.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/b03bb5562f64ba855dffcbf764019988/5099075852.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/josamimafodumozepikodole.pdfIn PDF document text
    • 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_off0000f9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BA 17380 bytes
SHA-256: 47180e3e43d15f37c2bf750c7afcb2ad9ef9e12bfacd35caf2a8215832b158fb
font_01_sfnt_off000126f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F0D 10552 bytes
SHA-256: 821025ad236e1d2778acc8cbc732603355d8a7b85ebb3fcd15146c4e40525d93

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