Malicious PDF — malware analysis report

Static analysis result for SHA-256 d384d3fecb661485…

MALICIOUS

PDF

75.8 KB Created: 2021-09-03 23:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: af5012baa186eb00436b4627fa0007fb SHA-1: ed4b6633fa435fff828cdd38d79e00f86411226f SHA-256: d384d3fecb6614858a336a3fa9f1a9d193c4edd28f605375b2818964ab2e56c3
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a strong intent to lure users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://agapetown.net/ckfinder/userfiles/files/teniba.pdf In PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/0835c5092db6c7649ab11d6568ce3806/nuvese.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab89a1407f2---94491171313.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/mebimodekoronemani.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7d666bdf1f---sixofer.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/zopagorogewifuxamon.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/10590512907.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc66c645feb.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/f6eb73aaa8b3d7aaa844f769d6a456f7/pimawunogexuxeros.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/loniwavojixaxow.pdfIn PDF document text
    • https://kaimano.it/file/83484572021.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fecefa6abc---82367554081.pdfIn PDF document text
    • http://cloverpark1960.com/clients/1/17/17c242f0968dc4bce059666b43fbd075/File/sagepubes.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100b73460ee3---9099099612.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/53513779065.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/71218057119.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b114de66a---wokiwawelebexusafu.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/gavewijasevel.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd74bc87fe---gaxanukaf.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/337e3d61683b21c820d961fdc2ea088c/7146519433.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/vexuvanezefudupodujas.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/7684837282b8a57d8fdf3cc6429912fd/75363006985.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/75654011130.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e05da997e3---89419880198.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=molde+de+letras+grandes+individuales+para+imprimir+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_off0000c585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC585 16708 bytes
SHA-256: 1c57a6c853ba714200d376a687809a5640d4c4ccdbbd0051be3f158b73f806ed
font_01_sfnt_off0000ef7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10793 11000 bytes
SHA-256: f9e856362c660865eebce216c672ac0a50613ffbfc5d5be0be446bac29af3352

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