Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa5a6aa916da7ab5…

MALICIOUS

PDF

81.2 KB Created: 2021-09-18 08:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2a3507b63cc27bbcf5560647e92d7f2d SHA-1: 4da054b942108cb14f201b6d8467b79064bace07 SHA-256: fa5a6aa916da7ab54e9cbae124407e454dd11f162c42a8d46fd13904b3c8ba51
172 Risk Score

Malware Insights

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

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains an embedded JavaScript stream and a link farm pointing to multiple disposable hosting domains, likely intended to trick users into downloading a secondary payload. The presence of a visual download button further supports the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://fastbeatbattlerider.saint-fun.com/assets/upload/files/67626651837.pdf In PDF document text
    • https://nibrasimansch.com/userfiles/files/44665592033.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/64832847612.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/sidibudewap.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16138c7081427a---sozuwibadabowu.pdfIn PDF document text
    • https://ducthai.vn/userfiles/file/xewekiza.pdfIn PDF document text
    • http://recrute.fr/files/files/16073319913.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/viziwob.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339299e4643---46011549.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/fepedenavu.pdfIn PDF document text
    • https://seas2010.cienciaevida.pt/site/upload/file/pazenuvejebenopasalux.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/55495240535.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/lujumivikarutekotege.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/17566724076.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/64860638507.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/gosaroratovelevefil.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d96be2517---lewizoxifejuzakukololon.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/18591989992.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/tonifomanotowal.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/38282800543.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///79975893027.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613af915a878c---35416613666.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/kiselotinu.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/45626291536.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=virtual+space+litePDF 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_off0000db77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF389 17600 bytes
SHA-256: 37d97d3db6108ad28496f92eb2fc69a1dfff918a83a0d2c398aa63743c7cf098
font_02_sfnt_off00012048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12048 10212 bytes
SHA-256: bbad2e520a3286579e09e338e12b14e4b3a2e45e7edf1532342592dc1c036e76

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