Malicious PDF — malware analysis report

Static analysis result for SHA-256 abfd8ec217ad726b…

MALICIOUS

PDF

87.9 KB Created: 2021-09-02 20:07:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3ceeb7ed4c31a4b4e0303094865f6f05 SHA-1: 4fd8db40a8605b21da1b3544657e3daddfedf62f SHA-256: abfd8ec217ad726b7aed0dffcee6f5c83046597145d8cded3b2344a046030902
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document's structure and URL patterns align with common tactics for luring victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/aa3fa61bd3d91e7e694a05dcd98bec35/vafajusegub.pdf In PDF document text
    • http://tokstar.com/_UploadFile/Images/file/vabebosepo.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85c2c2b11b---52199195830.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/72687857953.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/gozuvari.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/joguduvevofofirubafesakuz.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/46475450888.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/dixulegovekofunivek.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/26316518187.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/86964691674.pdfIn PDF document text
    • http://trinkhorn.org/userfiles/64528608207.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6cf6ba34d---55382592153.pdfIn PDF document text
    • https://t2sc.me/userfiles/97246085386.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/87641849760.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/12640222027.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/5bmuodk72f0bpr8vghrvs9198m/20378904019.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/bojixinemukupiludijikibid.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/munimekokegasikatokufa.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05de74b5ca---miwep.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d85997fed---38196471770.pdfIn PDF document text
    • http://songiadahoaian.com/upload/ck/files/bomababobuseduv.pdfIn PDF document text
    • https://shibbirs.com/media/files/41127594500.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=lyceum+college+courses+and+fees+pdfPDF 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_off0000f14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14A 18156 bytes
SHA-256: 3567cd3aade096028a352e3fd229c7f50dc525d35c3fada83ae135189f548308
font_01_sfnt_off000120a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A4 10944 bytes
SHA-256: 2dff1309bc935d39f11fa80c895ead75703a4a9ddf26e4dde4d61bc9fa9660d6
font_02_sfnt_off000139d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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