Malicious PDF — malware analysis report

Static analysis result for SHA-256 432e770f2c26267f…

MALICIOUS

PDF

77.8 KB Created: 2021-09-14 06:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 444e62fcc8c601d1b673144780619ffc SHA-1: 481d90efe14d3c85fbc0da370bf9d38f4c481921 SHA-256: 432e770f2c26267f89257b532911f16f58b412a404da9f340b8ca62da6380e60
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a high-severity PDF_RANDOM_URL_LINK and ClamAV detection. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/dif7fksifrmvnvddr40tuaasb6/mojap.pdf In PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/8f20fe7695478f0f5160900611c8d7ee/nefewidajujezita.pdfIn PDF document text
    • http://zenithmetals.com/files/magaw.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/demiwinojiwiwipeboguz.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/81918760189.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210914071602.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/8e1a9a98e663cfb0ae627e8cfd3c52eb/situsefesabena.pdfIn PDF document text
    • http://ilovestory.com/upload/file/63014386263.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/84544966145.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/fijigujegodedaxoja.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/85422479319.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109061721506875.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/dizanepiluboxijidutafaje.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/22649846616.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/2521961239.pdfIn PDF document text
    • https://udruga-invalida.hr/files/92337709338.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/wugigugovabamesidoxo.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/mobagipelokotisunugeji.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/liromobukabubelitosema.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/ribekakela.pdfIn PDF document text
    • http://falconltd.pl/cache/file/85079858264.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/23779488470.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613e62155658b---4389682855.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/31558252947.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=download+lagu+otw+khalidPDF 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_off0000c6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B8 10404 bytes
SHA-256: 6fa3b6fe0831c74c630caa2e72f31f3860c9d52bc8f013d68e91f524ebc09b73
font_01_sfnt_off0000ddfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFE 19724 bytes
SHA-256: 5ff8b6a33b14278b242b79f31b646d1630bc740d23c6dcc5a1f5d22f91d3bd8f
font_02_sfnt_off000111af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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