Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c2e302111ba76e…

MALICIOUS

PDF

88.9 KB Created: 2021-07-26 12:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ace9b0c6d9066285546cb76b997c4506 SHA-1: c16ea50f5e83cca9eb0cba4df6a50e9671cf0786 SHA-256: b4c2e302111ba76eb397c33d5ede2b204f783b66df0009c458032eb23bb786ee
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 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://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607743a251633---29621462230.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608764ba10646---pupokavaluta.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607971946f134---46456903293.pdf
    • http://industrialsupplies.pk/userfiles/files/15053542948.pdf
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/35530683050.pdf
    • http://seamacros.com/upload/file/26827713481.pdf
    • http://odpadykj.cz/UserFiles/File/67994142148.pdf
    • https://mayurherbal.com/userfiles/file/wikavijipezerevavidilixij.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/919fe86c02e35a88a09421f6b5a3a9b7/refobozobirovibiwisi.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/i1v4cr2s5m7agnr9qr55lchcns/fapimejepefin.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/d3b383914e167140bccd7a2f1afb99e3/rotak.pdf
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/10505234090.pdf
    • https://bankkartya.hu/js/ckfinder/userfiles/files/35025891140.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f6a65512f---pesuxewegu.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608877f82a308---47198448761.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/fe4ec7624ff9e80976942044c7b400ed/20259093937.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/t7ilgpu58mevuepi71uqghie91/lutezapaxoxeri.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b661cade39---5034378439.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7972305ced---fodovemuj.pdf
    • http://bclgrouptt.com/userfiles/file/18991730466.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1ebbeb9e8---60057287665.pdf
    • http://meble-tk.pl/userfiles/file/72473177802.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=hamari+adhuri+kahani+full+movie+watch+online+voot
    • http://perfecturology.cafe24.com/upload/editor/imagefile/zewifixanamilujologiwojiv.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6d4.bin
76db2a3506e061808fe2ea3e916b2e52b37a48e7ee6fb18acaa0d18a62974b7c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D4 17060 bytes
font_01_sfnt_off00012380.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12380 16792 bytes
font_02_sfnt_off00013b97.bin
2d2107c6248e9fff7f9eab3dca0cd364b4ed3a5122398c4e373e5e2d57a1f841
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B97 10908 bytes