Malicious PDF — malware analysis report

Static analysis result for SHA-256 91cd694d8266245d…

MALICIOUS

PDF

72.7 KB Created: 2021-09-26 06:48:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7fd8f5375005fe1c9510703a3aef5f01 SHA-1: dbb72a2094fa5d332e3d2526b9a541a77c53bb08 SHA-256: 91cd694d8266245db0a0b25b165a326b76473d5fac0a2ab51da06923881ffef6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It also contains numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://w-mill.jp/images/file/sudow.pdf In PDF document text
    • http://resheto.ru/users_images/fck/file/wonufirulul.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/70658892950.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/xopovidevezibebina.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/fugeleguzur.pdfIn PDF document text
    • http://idealthailand.com/file_media/file_image/file/93343692915.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0f9fb6364---sujasotiwa.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/5986475379.pdfIn PDF document text
    • http://zmz72.ru/files/file/fitujimipopisuge.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614605ed8bf5a---96508015552.pdfIn PDF document text
    • http://asv-solnice.cz/_files/file/nepejulitiwedomadibukef.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131d0dfdc1d4---jivafuzizolexaxow.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/rarenuzibimapiniwe.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4eb28f68a---xusamavijikanosufiziju.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/lakupirigopozabimisoj.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/9c028c0019f963972164b982558c0e53/fanamuwabojuk.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6969efbeb---wizabanukirubajikamotogo.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/wugog.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/vuvewokapelunajeline.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/nonepizopivo.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/49169674283.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/6eb6df6c886a28000402ad6e38de846c/perewufuvikojis.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/tijoligudanesup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=email+letter+for+sending+resumePDF 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_off0000b766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB766 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF78 17644 bytes
SHA-256: 2a315a75831512af20b301d325034f9f577a9808e4fa12cf193cb2c2973a231f
font_02_sfnt_off0000fc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7A 10780 bytes
SHA-256: 56bf4a3ea0f99651281af0a6ad34c428efbb9a61b203752b1dfa2c2a8dbb87a1

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