Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7fec8b40faf056c…

MALICIOUS

PDF

135.2 KB Created: 2021-06-27 16:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7d67473d89992f8ef4a01d49203e22fc SHA-1: 25c71c6dfc2796c6625afacd050ff1ad52fc2e42 SHA-256: b7fec8b40faf056c11dd8c1720f57fac37035d95fde3ed8ad70f2f348b692973
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised WordPress sites. The embedded JavaScript likely serves to execute malicious actions or redirect the user, contributing to a phishing or malware distribution scheme. The numerous URLs, many hosted on compromised CMS uploads, suggest an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

Heuristics 7

  • 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.
  • 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 https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c934377d2a250d047e5974d096c941cb/xobobubabepapopavege.pdf In PDF document text
    • http://conomiya.com/images/uploadedimages/file/83539554648.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/84223ade8518b54b21288d59e12a0a38/34421331193.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/5r9b7e6olgjnbfl4viiorf5iq0/88605485622.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b635376627e---31243229201.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f442fbf2d8---giletote.pdfIn PDF document text
    • https://mmszke.hu/files/file/19493470549.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/lowogaf.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/xoxuwutewiguxege.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/fc0e060a27c9382868c08caaf9a90f6d/12228554423.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/73076404746.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/92997408404.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/d56e2ccbbf9ec78d5eab14873614196c/gelirumomojaduworup.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/73094560150.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/d17c742b88338c11f909aafcb8ab459b/mukotujegoxozasigivaji.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/n1bvkm3aubikoq8798ei9ccor1/juzofoxameludewivitekenat.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/d005a113e0164b6dc721ee10811a7a6c.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/1a2a440616781f3680562a615a742b53/46735646189.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/zonakujinefe.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/rojodutapanisajomebuki.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be1581cdd5---gegopawepu.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/hoa67ikepq4512uo79qpiklom2/46781943640.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/j89gpt11n0ivvc6841i04ka65o/43100079486.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=rise+of+the+witch+king+manualPDF 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_off0001ab9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001c3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C3B4 11004 bytes
SHA-256: 84b5ec9e06ca2b393c727c09fc9c1a3a1a688d5d5a4584e5ab00a761b5289460
font_02_sfnt_off0001dd33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DD33 18260 bytes
SHA-256: 1f25e265c24881426d5e4f0854e117916fb832685736f7bd4e2bd0d8e4c1a2dc

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