Malicious PDF — malware analysis report

Static analysis result for SHA-256 20f594413043e5f0…

MALICIOUS

PDF

79.1 KB Created: 2021-09-03 01:10:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e8b02cfbf8a19dd551762a82a1b5b91e SHA-1: 1e8de061c90ab43ab8f58029399eaabb20a73576 SHA-256: 20f594413043e5f0c3758678f9296eb8a03b3c10772fb5f9908f6a7bef378b5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the PDF's primary function is to act as a lure to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • 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
  • 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://kimtuong.vn/isc/public/files/fckupload/file/sibubopazuko.pdf In PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f0abe9ad7---givejetor.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210531025438.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/l5dabbgfgdfbdfr4o60vg1mn2n/26238692411.pdfIn PDF document text
    • https://zegabilisim.com/calisma2/files/uploads/7226214165.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/24633038858.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160834608267f1---93628070328.pdfIn PDF document text
    • https://papiratisk.cz/soubory/meletexafoxovaj.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160fd9d72d97c4---21969836585.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/gejipiwigimiganabibigof.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/6smnd6u4dv0vgnl6r9oit61iac/nivimopetaxo.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/a6d3d188c0338578be16b1bfaa771ea3/nagowimiteduluzeratona.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210816020818.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608a16fa64029---83491460307.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/63700064963.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/99035859298.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/jeseleb.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/vaviwuvipozagifif.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/sukibekarapozelin.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/15578329366.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/34593744790.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7367465450---31266204235.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/41504353560.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=cash+flow+statement+in+tally+pdfPDF 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_off0000d2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E0 10896 bytes
SHA-256: fdc3c5cdde1a783087eac3a9bc5a92a431337aa117772dfc74a47de521829b4e
font_01_sfnt_off0000ebfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFC 16656 bytes
SHA-256: 3805001df782ff2d2c50c62df80f73ea3031e7197e78771ff769deffc971a4d1
font_02_sfnt_off00011734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11734 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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