Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff82d41dabfd9d7…

MALICIOUS

PDF

83.2 KB Created: 2021-09-15 15:14:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 04c546f61a6bc17a52cdb17c3a8c18a6 SHA-1: eef823fc48346aeefc7ee2c0313521f7653bb0b3 SHA-256: 4ff82d41dabfd9d7d05f694a65cac3244b185d6de4a07c5979efe6aab73d5eb3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that function as a link farm, directing users to potentially malicious content. Heuristics indicate these links are often hosted on compromised CMS uploads or disposable domains, suggesting an attempt to distribute malware or facilitate phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • 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://pistant.ru/uplcv?utm_term=free+spin+coin+master+apk PDF link annotation
    • http://paroissedementon.fr/upload/files/76994056787.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/3337880387.pdfIn PDF document text
    • http://telecycling.info/files/file/61321485911.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/65720612413.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/56506439729.pdfIn PDF document text
    • http://gibisch.org/files/files/83087535522.pdfIn PDF document text
    • http://budka39.ru/files/60308958811.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/befamasirilosoxir.pdfIn PDF document text
    • http://zaiger.ru/img/file/2956650499.pdfIn PDF document text
    • http://saraswatishikshamandir.com/singhania/downloads/file/papowoboxoxokolu.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/84a2e6c7aa7a8fef5a74d685ca655c0e/lezarugililibalokilumofo.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/68215307497.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/wefidetenan.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/derorudewugu.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/rojaboka.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/78587569345.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/18176414418.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/wedozilekijajibobifax.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/ludosisadijoza.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133ff1ee459c---90075856568.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc683a249d---61001923901.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/bitogononeripixiworoniz.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_off0000da67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA67 20120 bytes
SHA-256: 0ec9b05c5d7794ada971cde39c6d75321e78f6e787ef27729466cd90088d8d6c
font_01_sfnt_off00010f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12776 10556 bytes
SHA-256: 326a66a51e4081813f61834f2def405d9df6c74462e3efb5d126cfd2ff414e37

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