Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e35a33622464b1d…

MALICIOUS

PDF

79.8 KB Created: 2021-09-21 20:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b7171759e08c4b335b6780b8dc54375f SHA-1: cee71c2e87c11e4f5a84ee75ef1a41fee96ced33 SHA-256: 6e35a33622464b1df096da863e952ebb946af16275c69583a3ccc0917ff8fce9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports a lure-based attack. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious intent, likely to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=acr+premium+apk PDF link annotation
    • https://hamasataccessories.com/userfiles/files/16004109790.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/debalorikawolizelinigex.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c07401cf5---92994329847.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/67029503446.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/gadazawotijota.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/zijepe.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/36938882399.pdfIn PDF document text
    • http://bidadapatidar.com/userfiles/file/31031419460.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/v6i09e3jd3mjscqdjtkl7mq8ia/nuvizeparesojuworus.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f354633138---zixuliwenunaripugoz.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/86588324495.pdfIn PDF document text
    • http://veitali.com/upload/files/saxisuduxum.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/dasam.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/94436528242.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b618af11d4---mekelefovulopilovusove.pdfIn PDF document text
    • http://imoroz.by/upload/file/70524269559.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/kilovon.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/9417058321.pdfIn PDF document text
    • https://nghiepvu.udicmanpower.vn/uploads/news_file/zuwagojop.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/voxebokorigagafifimef.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/35924398995.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_off0000d332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD332 18512 bytes
SHA-256: b504e10334eb6200ec28ff2b225b85124c2e4bb0d01e1cac15c56864f52211d6
font_01_sfnt_off00010386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10386 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9D 10172 bytes
SHA-256: ab66d0e66b12ec3f8ecba52a7b6ad020628e5a243390403f80d27fe0179c31c9

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