Malicious PDF — malware analysis report

Static analysis result for SHA-256 224873fedb8249d8…

MALICIOUS

PDF

93.1 KB Created: 2021-06-28 07:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7697e2e2e554b53634a915f950e42639 SHA-1: 905c5a4e7b8be274e73e3590ee6a50dbb27d5819 SHA-256: 224873fedb8249d8ba9fb38bb3b0a9091916c82b99f44002d2f9d76b837e856e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of a link farm on disposable hosting suggests an attempt to obscure the ultimate destination or spread malicious content across multiple domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083e6728aff1---53416099344.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f8fc9b0a9---jakanoti.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/jn69aqb8bfgee338g2onf46tqr/fowidedoranirejuxulo.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/ddaca9df0b0d49c5061b80e5be6c1bd0/bodudusivisa.pdf
    • http://huntland.hu/upload/file/74168262276.pdf
    • https://pet-fashion.ro/mm/file/rutasepiwokabesez.pdf
    • http://altelaw.com/uploads/image/file/22716304115.pdf
    • https://associazionedynamica.it/uploads/file/55274323900.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/25ec4cfc4cd66776ccb22233d973c6ea/12013753911.pdf
    • http://weberstellen.ch/userfiles/file/84775577828.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06f7f4e236---78814845629.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/0084345ba08a89f6b81f72e2f95d7fac/nesafumitedobakinaro.pdf
    • http://malagi.pl/user-files/fck/file/19443638265.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1609631d399b59---6281460643.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/e1g7s6f1fgk6mtk42jtsca8mq7/gekibosavagoxagu.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/hcbkc35l5jg2qk6df7rqaqtce9/57700258054.pdf
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/2a3d794d6a4482c17c2e9e0088b27636/rovegenala.pdf
    • http://c2r-auto.com/uploadfiles/file/2021062614442873499.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/c4cf1118ae08f64f52942403c3d77fbf/38104404071.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eac0fadfdc---walexokimovodafonuxuk.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/1g3e05a0fbf7oui7thhb293vi2/mulenebeni.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/3671edb70b65d397915acce4a4e513e0/72452680855.pdf
    • http://kolasinprevoz.rs/slike/files/zolelozizegoxidosi.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/8pup7updgmegjmmm2qe8kol1ru/43587007140.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/5dd301ff820ac774f16f50fb73f6f9ae/68302520987.pdf
    • http://fontanarosaserigrafia.it/userfiles/file/6549391702.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=vedic+system+of+education+in+india+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_off000109eb.bin
46381ee48440d3d89a8a482eb24b1d4d6069168ab0150066b4e6940a18bf0f13
pdf-font-stream PDF embedded font (sfnt) at offset 0x109EB 10816 bytes
font_01_sfnt_off000122f1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x122F1 16792 bytes
font_02_sfnt_off00013b03.bin
d3e84b5ba3f7f53a331e9a7be7f6d981cfed55e9b1ae0a15e911774eba3ac19e
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B03 16896 bytes