Malicious PDF — malware analysis report

Static analysis result for SHA-256 63ff7e8b82c39eae…

MALICIOUS

PDF

84.6 KB Created: 2021-08-15 17:21:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0cfb353c96d3d4ca8a84f81abe1d24b4 SHA-1: cef38deef0d51edf208afc67debf8c0308d6a1cc SHA-256: 63ff7e8b82c39eae41135ef94526111024eb411a48ca4a265090e976f00dc792
164 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many hosted on compromised CMS upload directories, suggesting a link farm or SEO poisoning attempt. The presence of a 'download button' heuristic further supports a lure-based attack pattern. While no scripts were explicitly extracted, the nature of the findings indicates the PDF likely exploits vulnerabilities or tricks the user into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/uplcv?utm_term=superman+logo+cake+template PDF link annotation
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929cfbd2aaa---zezukipazikowixinaxaxax.pdfIn PDF document text
    • http://www.netcorp.hu/data/editorfile/62646141778.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/40747617520.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160fdbf1becb24---10530599132.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202105300048260561.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/wowuzilaxanaxu.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/bcaf74ea8a7e79a446d96bc1cadcd9ef/93674416746.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a833db12baa---99836776468.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe3233ca0a---86156279088.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9778637f95---1584869091.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/59717345232.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///riligisuwodel.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1610110ef995ee---4214363295.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/jizidosuji.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/54795780184.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/55936224754.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc700d84ca---nunimobopubuvepo.pdfIn PDF document text
    • http://dptour.net/bot/ckfinder/uf/files/xorowikagol.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/rebajuwagowuzizes.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/c8f5478bb096c74784195c9ffb373e0b/mufuxowetefagij.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/qdtaoib7j2a0vg9k6k97tnfjp9/tanojuraxepesuto.pdfIn PDF document text
    • https://nowtravelasia.com/userfiles/files/88374771986.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100dff6b4c21---22575172715.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/39901554486.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles//file/30697765727.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/87425844433.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_off0000e4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DC 17164 bytes
SHA-256: d1f769dc0b80d7de1e977f03417114dc113101c8e5fa6822358a019537b5ef09
font_01_sfnt_off000111f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0F 10724 bytes
SHA-256: b54e6418a8b09ea060e80f7ad6939e50e4105e8a3233a4e0316d53803e119490

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