Malicious PDF — malware analysis report

Static analysis result for SHA-256 604fef65f960c875…

MALICIOUS

PDF

71.9 KB Created: 2021-09-03 21:11:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 336e5dca335c2c91dc8474c37424e966 SHA-1: 3e7d3691b47f25229f22b0871df9a0e1e600dd71 SHA-256: 604fef65f960c875612331fc8096abc4f8dae662e017b0bab4827f89289908d2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it is part of a link farm designed to distribute malware or facilitate phishing. The presence of external URIs and the overall structure point towards an attempt to redirect users to malicious content, likely for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://catamma.ru/uplcv?utm_term=ncert+mathematics+textbook+for+class+11+pdf+download PDF link annotation
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b4616f0ac---32647914563.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/cc455538bae3b4ba7a248e1285d10e2b/jijagawojin.pdfIn PDF document text
    • http://qctc.vn/upload/files/rofebowepumusopefidu.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/28558435513.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/n1bmh77va98gtkqvd93uekf4jo/26967151328.pdfIn PDF document text
    • https://tonitomov.com/picture/file/20488788401.pdfIn PDF document text
    • http://marketherballize.com/ckfinder/userfiles/files/6679943706.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a20a2d0d228---zepapusupabegafumaje.pdfIn PDF document text
    • http://live-net.it/file/tamoruxafezutum.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/dalebozopetejowinenujag.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/68742375951.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087bf5f82660---66673956874.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/25193718891.pdfIn PDF document text
    • http://tort-art.ru/userfiles/file/53495687077.pdfIn PDF document text
    • http://canadanur.com/resimler/files/difikepadev.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161172231c2db6---newijomeki.pdfIn PDF document text
    • https://guijek.com/userfiles/file/48691507405.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/spmpl0n3p5nokphj1imqnj10h3/92860793703.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/diketojatafavuratapuw.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/ekckateqj0is3h8atrsmqusn7q/25384472894.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_off0000b447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB447 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC59 16860 bytes
SHA-256: 6aad616dcee239a072ff4d5708a0d85f52736a5592a4606ebc82bdd754ae5e1b
font_02_sfnt_off0000f752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF752 11332 bytes
SHA-256: e5b61fb3cac9d9a9c841fb91e1be19e5bac7d28f874e82d3d94760d336cbe820

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