Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7edb9c1fdb1c93f…

MALICIOUS

PDF

91.3 KB Created: 2021-07-09 08:16:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 11251f025cd6be78345d0f76e3c93c15 SHA-1: 66e665f112ba103a2722b56a36931883b4d7fe3a SHA-256: b7edb9c1fdb1c93ff60b514072c7cd2bc1d18bfb98c3157da9c6eca8619e9784
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. The document contains a link farm pointing to compromised CMS upload directories, suggesting an attempt to host malicious files. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9850

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/964f76f4345a10af1189e9cc6b084b74/penewazavu.pdf In PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7067966c9---ruzebizomo.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/491ac2b8f12a0adabe98bb0d9deb77d8/legerer.pdfIn PDF document text
    • http://hydrem.ru/images/file/zitiwasuruxisekutivigibit.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3c3387ceb---28282403979.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ed7dafe95---viniturodu.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4c8f1a088---janulamemox.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/xulidedodakamoluvirulolo.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be88d65d5e4---30399350658.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f2304215f---5388688482.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/pqpfikbq1af942nfvjfto1v3r4/72908279931.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aa455013aa4---gibawogevoge.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b05aa5a1a---buvobopujem.pdfIn PDF document text
    • http://blissworldbeauty.com/newerac2c/userfiles/file/katopukovavukakij.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/85413281906.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfda38fa8a---93108936523.pdfIn PDF document text
    • http://citra.cl/userfiles/file/42111040801.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/japanilakofux.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608853dc722d9---kozap.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a377036482f---giraregel.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ed90e23f8---lulov.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/xaxiduvako.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/nodatarariwirobokip.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/nurok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=boiled+snow+crabs+near+mePDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/2b2134f7153dc05af4ec3d9f7d4242ad/39852137318.pdfIn PDF document text
    • 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_off0000d859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD859 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06B 17504 bytes
SHA-256: 6580f30560a4e03456103618f148c51036f1e78641bf7b8bbf5e5847272a274f
font_02_sfnt_off00011eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAA 10712 bytes
SHA-256: 863b449607046c7f0e14247222aa878811850d046e669808897326ff0ffa33a4
font_03_sfnt_off0001373c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1373C 4776 bytes
SHA-256: 8c225c71add9ac78145f545ffc1ba27fa60682623e18ea0323d7beb62cc56f18
font_04_sfnt_off000148a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148A8 16320 bytes
SHA-256: e59a6cc32d04a7cacf5e921f93d593b43628e7473256f987049ae3dc7b35c891

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