Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5fa19ae683454e9…

MALICIOUS

PDF

68.8 KB Created: 2021-09-16 22:10:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 51c6d85dd7faf696c6a0d26eabc60a48 SHA-1: 13928d29ca9bddd68d08e53e7f0bd4c3a09ac5e4 SHA-256: d5fa19ae683454e909ddf3ad63d82dca9b75f5296cca76be837a5f109f063f8a
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to potentially compromised or disposable hosting domains, as indicated by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs are designed to lure users into clicking on malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 http://viswinkelindex.nl/images/uploads/zaxepivifuf.pdf In PDF document text
    • http://wahluenfty.com/userfiles/11641101886.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/34159785894.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16131c64c39d18---73684335795.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/foditisikaxamo.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210914135310.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/86466490631.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/jabubomuwu.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021091007181863.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/delogimekeratep.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/5jijhr6na3pqbte2j5f68jlni7/fuxijujiremezobip.pdfIn PDF document text
    • https://norservis.cz/files/files/gotekefop.pdfIn PDF document text
    • http://jcpingie.be/public/files/10338615739.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/xavariname.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/50701232360.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/dakifemase.pdfIn PDF document text
    • http://tjchenxing.com/filespath/files/20210903222354.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cd688c69a---47427223249.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16141a245265f3---41200750736.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/11930590455.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613825a0de108---nefigukobopunedike.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130c69cd567d---25378659468.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/votetoxow.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/siveduv.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/98629737171.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/wokizepufudax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=wattpad+downloader+for+androidPDF 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_off0000b258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB258 14292 bytes
SHA-256: 5ffbfe6a7d7240e699ee4aa98511e4a0c93ef17991e69c5110cdebed1394f0e7
font_01_sfnt_off0000d5c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C2 10400 bytes
SHA-256: 4742bd735c5646b794291e48679c3cb147d735747a09b0678a25acaadcd4edb0
font_02_sfnt_off0000ed6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.