Malicious PDF — malware analysis report

Static analysis result for SHA-256 05cf27385da1e94c…

MALICIOUS

PDF

87.5 KB Created: 2021-06-27 06:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3479bb5e0a7f9887e881f784ef011714 SHA-1: f2caf8a619d2b31edcaa116cb72bb0f50cd6a857 SHA-256: 05cf27385da1e94c8fec4e02291c1deaeb449f7d43f342aa92dc2c2d7f311f88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of multiple external URIs and compromised CMS upload links indicates a clear intent to redirect users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pistant.ru/uplcv?utm_term=in+the+handmaid%27s+tale+what+did+they+do+to+emily PDF link annotation
    • http://boissee.fr/userfiles/file/kurupofakevodaferabegojaf.pdfIn PDF document text
    • https://agermag.ro/mm/file/92076385477.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16070dd382ac35---19119559893.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160987edd195ce---83108230139.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/57711408283.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd59843df0---71846224221.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/10074582809.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/fotanamo.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/47688115232.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/kabokaropiwedujikebuve.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/e2dfd9c9ded51621ab3fe19eac0e4751/rumaj.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/jv1mtphag1molmhs8n94osm8c4/zitutud.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/8338b63671271c7eb512c7b0904e3791/55811244616.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d38f3d19c0---18678366287.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c4e7ab575---16372261411.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/3kiq0j2qodmfj2nujq619t20rc/lisutamaguv.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c588140a6---97529199400.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/tazorexizu.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/e837278c969de7eac6e03c84fd95fcc5/20920548073.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/manewuvotolasogewevik.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab97760a32---37934488722.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/38255568179.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/nusigopovezuza.pdfIn PDF document text
    • http://remobudostol.pl/pliki/duragibasodunuvaxuzuse.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_off0000f4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B0 16736 bytes
SHA-256: 0550f9220b19c55549e7f79054642f65749ff96489c9c2d794a9e9e98f8aeaca
font_01_sfnt_off00012026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12026 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001383d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1383D 10596 bytes
SHA-256: f868e4fea29f1f579219cfc89574e66ff99ed6339d2860656428b79fcdea3197

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