Malicious PDF — malware analysis report

Static analysis result for SHA-256 67d57ae762bd57d1…

MALICIOUS

PDF

81.2 KB Created: 2021-09-17 21:23:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2064b3dca188715a6b7c401aad2ec13c SHA-1: e159bcbd5dd566b047e4b5dd60473c827ccdd2a9 SHA-256: 67d57ae762bd57d10bce931dcca26a200be5cba87f90e957c5bea594ace2e8ef
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ev-owners.jp/userfiles/files/38498716206.pdf In PDF document text
    • http://whdhgs.com/uploads/file/20210901123204699.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/xokegexesasi.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/wevitutunemetomurazova.pdfIn PDF document text
    • http://uniondrygoods.com/fckeditor/userfiles/file/42873296772.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405c4fa8145---jitomobutumeditebojekal.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/zugopapojuvemojo.pdfIn PDF document text
    • https://lapakunited.com/contents/files/53398754610.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/96070526295.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/xopuxiwimefanipimas.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/xiwuzi.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/vixakilitizoke.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/zidutojanigosixinumijivo.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109031005274495.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/43351996936.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/38315113316.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/45067a32f2f3cbf90f7d06ba1dd60f27/91106328122.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210910162309_1335954875.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/sibuzinemaweta.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b272bc035---15085030930.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/28801b92fb127c3c26160391b58cbb5f/welezisogaduj.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21163826357.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/jezomesedosomuvup.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f638f572e0---85432774600.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=redmi+note+7+miui+12+update+indiaPDF 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_off0000d95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95B 10608 bytes
SHA-256: 4f8801ae37e73681764bb29e9dc31fe6f4411d2fda98cac5564a3f3d8e3b984b
font_01_sfnt_off0000f1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B1 17388 bytes
SHA-256: 465e924634ccf3e95c715ae12764ea5743179822cd51bf15376de3937770467a
font_02_sfnt_off00011e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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