Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a953329d9df94ac…

MALICIOUS

PDF

75.0 KB Created: 2021-09-19 06:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 68995476aba04cec52778defb8e3d772 SHA-1: 5f46f364c8e0009c3264c48e001b67e0f01b1645 SHA-256: 0a953329d9df94ac2e784dda2ab929f8c0c937b28493b5d854ce4ee2ceb6aabf
196 Risk Score

Malware Insights

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

The sample is a PDF document that contains numerous links to external resources, many of which are hosted on compromised WordPress sites or disposable domains. These links are designed to trick users into downloading further malicious content, as indicated by the 'PDF_RANDOM_URL_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://garglob.ru/uplcv?utm_term=windows+movie+maker+32+bit+offline+installer PDF link annotation
    • http://aftp.bg/userfiles/file/84030604361.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1614047bd9f24d---tuxikozenezaxubix.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/dokovir.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/85977743205.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395581883fa---lutezewetul.pdfIn PDF document text
    • http://hanahana.vn/media/ftp/file/98738586130.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/xubadumevafezixumanar.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/lolopazonizopori.pdfIn PDF document text
    • http://dakotaterritorydevelopment.com/ckfinder/userfiles/files/nozugejenudoki.pdfIn PDF document text
    • http://ippon.lv/uploads/File/vovikivof.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/zuxupox.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/45818888034.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/74162661961.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/retekonenubenizudigu.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c546d450f1---2662744384.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd05c05a06---73736370549.pdfIn PDF document text
    • http://deltools.com/userfiles/file/41034845601.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/228da37dadc55b0b68832e2da3ec67e9/mibamobanumipadajadi.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/nozuwew.pdfIn PDF document text
    • http://wenxuezj.com/images/File/rimelawasasawapevufi.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/90213959380.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/tudupa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD909 11184 bytes
SHA-256: bdddbbffeec9a84819f5a7e1e2ab14fc796844ed04f3c9d04196af6687d17e19
font_02_sfnt_off0000f351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF351 16400 bytes
SHA-256: e561d7b9a2a4bcf5f073afd5b1ccba129c02975118ea36da807bab6c14865c0e

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