Malicious PDF — malware analysis report

Static analysis result for SHA-256 89f0b360ea7e3735…

MALICIOUS

PDF

74.9 KB Created: 2021-09-07 18:24:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 78019cf09d9414549e3daeb38a3b2d68 SHA-1: f7a6f64721436334152510f129c2f70fe1ed9ed6 SHA-256: 89f0b360ea7e3735016c2a82ad1d5f9d7f045c8fff533c899ea1cfe796e6cdb1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. The presence of multiple links on potentially compromised infrastructure suggests an attempt to distribute malware or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/b0d11315691518a0d58b059f7212c1b4/musowulegu.pdf In PDF document text
    • http://clarksville.net/wysiwygfiles/file/vesugot.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/delunap.pdfIn PDF document text
    • http://waltripclassof74.com/clients/8/87/875eff38522a6836d9fda94c5a2b6b26/File/6877786758.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16080d5f38a11a---zebebobuwegazopuxokawuged.pdfIn PDF document text
    • http://octapus.vn/images/uploads/files/24234953745.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/94810229536.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/4e7199c104ea38ef4706eb2197c3d752/73297949933.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c55bafd54fd---55626988318.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210430084601127.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/59350217432.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/pekexekerunawa.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/97926529753.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/63298726107.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/zudipizexa.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/manerojivapixupeni.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/87413823643.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/42216768389.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/malijififis.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/48236177221.pdfIn PDF document text
    • http://naucseto.cz/storage/55772375073.pdfIn PDF document text
    • http://travellerisland.com/files/48539755874.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161003cdbb2d37---53311274990.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/36168365887.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=karyotyping+techniques+pdfPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/dotiratefejafuparukago.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_off0000bd11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD528 11204 bytes
SHA-256: c5f0119c073e8b9bbcfa541b15985e892c57eed00626960845ff67232c4b27a0
font_02_sfnt_off0000eeda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDA 18044 bytes
SHA-256: b13b21b56d56a6ee56be52095dd25e97e4f46af752e067bf90ea95722865723a

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