Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc4bd96fa5b36dff…

MALICIOUS

PDF

73.0 KB Created: 2021-09-24 13:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f8705ef015c26dfb4f09cb678da04017 SHA-1: d265c0f283010c7fa6e67ce969e12e60010a56fa SHA-256: dc4bd96fa5b36dff4b384deb627713c3cd41a99d8e89dc4f3f1fc6fc3106a53b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged as a link farm, with several pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=how+to+turn+on+cell+phone+with+broken+power+button PDF link annotation
    • http://driscollandgibson.com/images/edit_images/file/lixifemidawovulowapedul.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/35456129026.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/zakazuv.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/wipopuzalowepomuxenareto.pdfIn PDF document text
    • https://equimat-cheval.fr/file/70128528161.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/dosobijetonojavenalemavu.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/go4lplaos0lg3gqim7nct38oln/82601295639.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/vopelidewubesuza.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/44091087951.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109091449141580.pdfIn PDF document text
    • http://com123.vn/uploads/file/47970284648.pdfIn PDF document text
    • http://synphabase.ch/upload/file/mozenifo.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210923030847.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210917163034.pdfIn PDF document text
    • http://kcwoman.medsoft.kr/pds/userfiles/files/13406879963.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/898fd7edf4758d4d38b0d24eb4fe76a8/74593313490.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f5fdb436c---69163436618.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/65488661613.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/boluku.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/jebutibefedo.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/70756455634.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/58383508746.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/175e3b9f86faf018f9556ad3354aa939/30601874721.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/20610042103.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_off0000b69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB69C 10548 bytes
SHA-256: 5eaa948937b6c9292a8595501da2a37fc27d76298547ae75eacf5d7947abcb6f
font_01_sfnt_off0000ce4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE661 18304 bytes
SHA-256: fe22b4686c76c081883fc568b4b2008d1355415b493ba20806d212d03e53df2f