Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd259541142a49c8…

MALICIOUS

PDF

107.4 KB Created: 2021-08-13 13:33:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e40f4326201d01d0c9e84d787ddde025 SHA-1: ad5768164d578c3d064c0e44f8be3a2d2321fd47 SHA-256: fd259541142a49c8d0d4188a88cf7d537a47e6635bd30cfd565031b3d3ebda10
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress upload storage, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d33155f223---puwubixon.pdf In PDF document text
    • https://creativitagh.com/pevron/www/img/file/wejixuwozobalekuveda.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/4d56e747d4edf61e36a9638707c8633b/117682321.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/3e513c61b698ff47a7012032f40de815/wepikojiliwewov.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/rg79ga86pk2k9t0gheadb72751/47228894471.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/watumaseferin.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/19620965696.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/50f0a3f28afdd9373dc5d2b1314891b1/futokunuvagekug.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160929b9328f4c---nevudijemoko.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/rabodamigelapesetokulexiw.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/ftderjdj73g16849jbio7t5hrh/39152777246.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1610cb1dbf058a---55707945154.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/6662072596.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/13fc498e85fc010a4736528af9e928fb/timon.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607099f88327e---xomigaluwibiwugajun.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160849b18905ba---51594441002.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8c9aa72df---ruvelujijokow.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///majetup.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/37112671109.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8df73bcf3---besebajuvexuselodilu.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/2t3hrr3vhf8jsahtaodqh7p7t0/24973945606.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/b2277b3b846fb7bc84c52dff88c1d126/laduvusorabajobapawu.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb74784df5---rivudugipen.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/14779761808.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/2910966be7232290e1b9afd85daed0d0/megixopuravabupi.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/paximisazanasudewas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=cash+neuro+book+pdf+free+downloadPDF 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_off00013d41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D41 18164 bytes
SHA-256: e6f069fb04b27c9b8969b9bf1bccbbd3237c0f6321ec50b194e53d50dacb7337
font_01_sfnt_off00016d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D67 10856 bytes
SHA-256: ec4b972608a92adb10b2510ff2220d8a279d76768d89a1803333ebdd58c7c3d8
font_02_sfnt_off00018640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18640 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1