Malicious PDF — malware analysis report

Static analysis result for SHA-256 4459c959fb5b5a6d…

MALICIOUS

PDF

76.1 KB Created: 2021-09-19 11:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e4b17b362d5bf2805179ef397dec2286 SHA-1: 1462b66040624192a46f0d6f55ae36f4fc09a8b5 SHA-256: 4459c959fb5b5a6d949eb8011b2a8ff00ccbea06547cc292e8531ee22c6db098
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://winso.tw/userfiles/file/darovoraramewe.pdf In PDF document text
    • https://bnbcostaverde.it/userfiles/file/jowobusifaxaki.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210902_132142.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/88603080425.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/55357310373.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/639583b6b27a24d8daf8e960f707a345/88163822615.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/lifatobediti.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613f579fdbe1e---58192635219.pdfIn PDF document text
    • https://12shio3.com/contents/files/14549358561.pdfIn PDF document text
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/58594245284.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/gabujir.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/69806126775.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16137e8cbc071a---87369792171.pdfIn PDF document text
    • https://geloracinta.com/contents/files/67982463474.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/kisopatazivawatin.pdfIn PDF document text
    • https://simorgh.it/uploads/file/88085385330.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/45594882591.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/ec4ba1153ac6b1f1645786697131f062/25650038885.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/b22b6572bb17041dc7924bcbc77b5b3b/kukavolaxidawewus.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/bolunelowugolegelasebutap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=iphone+7+bypass+price+in+bangladeshPDF 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_off0000c242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC242 18132 bytes
SHA-256: af4450215c859542b6df2b1f4c4ba3c42c135f6df2100c13e0ee304af391cdba
font_01_sfnt_off0000f1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F9 10948 bytes
SHA-256: 0a66e5a454dc58795c9d4757a723f7c8289c5b5cbadcb49c660f583544e33f45
font_02_sfnt_off00010aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1