Malicious PDF — malware analysis report

Static analysis result for SHA-256 b02dbda91d870df5…

MALICIOUS

PDF

85.3 KB Created: 2021-09-22 09:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7a261656e8d4b6e10d6ea5ae767ad995 SHA-1: f41dffbab1ee40ac7b7435975ebf8939b8369641 SHA-256: b02dbda91d870df5d0a3819bbb076da50df8592ec603717a15e3b5fe2895c387
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains heuristics indicating it is a lure for browser extension or update installation, a common social-engineering tactic for malware delivery. It also features a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious files. Although no scripts were directly extracted, the overall structure and URL patterns strongly suggest the document's purpose is to trick the user into downloading and executing a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://mangonebike.com/uploads/file/fufutivepozutuzufener.pdf In PDF document text
    • http://kingsap.com/file_media/file_image/file/noraduvogikutumogibari.pdfIn PDF document text
    • http://hadt.vn/upload/files/77074164569.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/67770872443.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/jibojelulimaberi.pdfIn PDF document text
    • https://finliz.lt/i/File/74679191688.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a02daad227---mavupuxipefetafuwaniraje.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16141d87f0857f---7681383111.pdfIn PDF document text
    • http://air-ned.com/uploads/files/zezesarirogabusofokug.pdfIn PDF document text
    • http://patrickstaxi.fr/userfiles/file/vowafufuruv.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16143399a3774c---gikunokorovididuwewul.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021091516072673499.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/12199580002.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16142e2ac5e83a---94652345469.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/39329910187.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/katogen.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/tamogov.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/58578474577.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=secure+new+download+apk+among+usPDF 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_off0000e53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4C 19136 bytes
SHA-256: 955fafbb7b6b769dc65722edfb1b5ac8ae4eeeec037735fc223e2dd2194fefff
font_02_sfnt_off00012ea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA0 11020 bytes
SHA-256: dc95fb587ec892a5a873a3844621dda3483a4f3fdbf069c4a2b90a5872017f53

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