Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9a08376b75a5de0…

MALICIOUS

PDF

100.1 KB Created: 2021-07-19 01:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 16718aa82449e90d5c8d6160eabef7cb SHA-1: 25b9c1e55fd4e5c42c3260c8ad9485c247dd36d5 SHA-256: d9a08376b75a5de03b9872aea43d6ba0d46463ed3b9f85b5d0fe853d1e22a8b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to compromised WordPress sites, which in turn host other PDF files. This structure suggests a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, with the latter identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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 https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd6eab8014e---25437892847.pdf In PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba8594be12---66980150914.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/sudonitovuzurikeged.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/zanijoz.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/togogevixo.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/bbe179ea1d0fe02d50024dd018b47836/boxekezu.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/1dce6b71fad5ad07af6150ca5c94b931/moreketipiluxosituripijaw.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/498f97fb352ac8de0b844b6b5d57e287/45195847810.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/bogalagopoko.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607940908dc54---dasuga.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210602_3310BA600EBD3DD9.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/tekokaxovavowigetumagi.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/10302837079.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/9jmm65la22j6hior2o1bidhfag/76660255381.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/q95i38sufdhls1a5mm8f3kstv0/17847735920.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/a2f2996b4b68c1b40ecf4c057ba69959/defoledivuxojuxetowemoras.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c88895f1305---63071754209.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/70320206962.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/6794c8088019dc5dbaa0cd481f21e4b4/5365291010.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c505273106a---9145145819.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/20945539443.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/50366499388.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/tizikejoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=possessed+meaning+in+marathiPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FF 10648 bytes
SHA-256: 614e460bede87ed8029ab588ba9de6b6782a985019456e07af7466fbab960cba
font_01_sfnt_off00010bff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFF 18396 bytes
SHA-256: 12506a670896d7af95dc507a68505affd777bddb979fe503c215a47fd848cbe6
font_02_sfnt_off0001299e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299E 2052 bytes
SHA-256: 9d4141ef5991acd2b94b6c0b5668c5858ada0be990fd583870782e61b943e83b
font_03_sfnt_off000132fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00014b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B0F 21804 bytes
SHA-256: 8c053a5d03529035489aad2e092b6ea66240dec6e9c65be7e847415cca40ca57

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