Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfa5127815dcd0d9…

MALICIOUS

PDF

69.6 KB Created: 2021-09-05 18:11:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a5d69d78414b1db0ead937af2e0690cf SHA-1: a88143f9682e2601f4453a0e545aae6a536b75fc SHA-256: dfa5127815dcd0d95f874c7042ed529230e22ddbe710d56996c955e3dd1c5415
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing to numerous domains, many of which are hosted on potentially compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of multiple links to external resources suggests an attempt to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://naitikfashions.com/ckfinder/userfiles/files/guwirefubiviwatidunelujon.pdf In PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/47dflnvjtlso842bgu58fvjpr2/80392100324.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d2f9268b4ba---mixaxolukepokelizamef.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/zoguxegaxol.pdfIn PDF document text
    • http://lalinpress.es/ckfinder/userfiles/files/32790851314.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/62531870574.pdfIn PDF document text
    • http://chpcentre.com/files/file/63765793659.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/1bc598b39c32402615f592172d0c83a5/63277322256.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/rofexowenoruwo.pdfIn PDF document text
    • https://euchebnici.com/img/file/safumopawajopurimen.pdfIn PDF document text
    • http://bwc.lt/i/ragabujojazujode.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fcc2ead278e---defaguruzuwotudafo.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/sagodamotorifezuto.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303012401da---93391715094.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078a76d87592---sumexopirozulusajami.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/sutaxelitezororer.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c3abe0589---jepulefi.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608448010dfc3---lukazovew.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/fepunisalofuseli.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210706_052208.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/bibow.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/ghbqvo74ccjdu1qimukg0lo640/vavivijogonizurebasuwubex.pdfIn PDF document text
    • http://paliukenas.lt/i/File/bebezedugasasu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=scr+gdce+syllabus+2018+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_off0000b136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB136 11312 bytes
SHA-256: 97613597227a9d7004752f67dcba9c5ff3cc12c177da0b5eaa51e2ae5e7321ef
font_01_sfnt_off0000cb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AE 14780 bytes
SHA-256: 5a11950a6f2fd94fe26b1568bb6f8f249783087a4bd9788011b63bc4a5dbf7c2