Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cd7cab5e8691573…

MALICIOUS

PDF

88.3 KB Created: 2021-09-21 05:22:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ca0df0f5cadb97846adb84a0d70ec820 SHA-1: 0e5d494cedeeab56965f7a7acc7c2fe115286dd2 SHA-256: 3cd7cab5e86915731972dfc4e1d451c904ae85fd700b492a8a7d7563df5b45a0
116 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable domains or compromised CMS uploads, indicating a link farm or phishing lure. The ML classifier also flagged this PDF as malicious with high confidence. The presence of numerous links suggests an attempt to direct users to potentially harmful websites for various malicious purposes, such as credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=how+to+take+off+voicemail+on+android PDF link annotation
    • http://schokoladenbrunnen.de/idata/kosapawuwegerofofizip.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210908102742.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/vidivolevom.pdfIn PDF document text
    • https://coluer.ir/documents/file/68796341282.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/36613927929.pdfIn PDF document text
    • http://abwrva.com/uploads/files/76512844565.pdfIn PDF document text
    • https://matratva.in/userfiles/file/79795992577.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210908155746.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/15582075400.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcd236cea1---78330775682.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/wogegilexonabipe.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/30498123696.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/kesinitab.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/f4473ef461e284fc2abc6e65da2cb4bf/kubatijoper.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/91026996658.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1614726295513a---rakipemudori.pdfIn PDF document text
    • http://surtek.biz/image/files/20150329_023646.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/83360725507.pdfIn PDF document text
    • https://rossbeede.com/userfiles/file/25935113408.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/24008082785.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/66493873679.pdfIn PDF document text
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/16488042782.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/31689036190.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613305ec39975---lubegide.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/jafataze.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/xadoketizazajuserewetu.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_off0000f4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C3 17844 bytes
SHA-256: f19e7865065dee952271a7365c019bdd70f59089b94fce0647d21aff6528f3a2
font_01_sfnt_off00012298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12298 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AAF 10704 bytes
SHA-256: 6937be22470bf5dff9bcac6c1548e42779a1196201d75812165570015524acb3

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