Malicious PDF — malware analysis report

Static analysis result for SHA-256 c65c6178ebf5c5f4…

MALICIOUS

PDF

88.6 KB Created: 2021-07-13 18:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 414fc15ea8d7e8411f5206483986771c SHA-1: 7c7c755e39fe4279262a2dc30e0d96fa1a38d491 SHA-256: c65c6178ebf5c5f41fca01dd78af1acf22edafe0b770cb8978f66be6f534880d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The heuristics indicate that the PDF acts as a link farm, pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • 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.
  • 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://www.allatpatikapecs.hu/images/file/44107022538.pdf In PDF document text
    • http://allprintusa.com/admin/images/file/wajotuxazorujemeb.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/70901696256.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/d625f86c0919adb10f02bdf17b661253/pudakeforexelitukekube.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/5919eff9f8de4fe41f3658422e030173/lukawebaraw.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aaec595135---xadajazuxegijowebexe.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d83c1e35bc5---57716812842.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/27553397622.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/28719197484.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/jufoxulejewuxirok.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a6bc2aef6---pipok.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/28627163600.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/26782854593.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/61814628114.pdfIn PDF document text
    • http://cobbpaynefamilyreunion.com/clients/862770/File/daxuzime.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16082d5a3a529b---bumojuwesevezu.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/dopibalolejusunume.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///satonope.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/neninikiruze.pdfIn PDF document text
    • http://centronegozi.com/public/dasewijadob.pdfIn PDF document text
    • http://ducthanhtam.com/uploads/userfiles/file/lemonoje.pdfIn PDF document text
    • http://senn1962reunion.com/clients/2/2f/2fc2c703930c5c120d54ce0350dd22c7/File/15083695929.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f543860707---tadukerojafokeluk.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/nijowug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=beef+free+throwPDF 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_off0000f9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C7 9880 bytes
SHA-256: 3bd60ff250bff1ae5594e148c5712130c58a4e8b94c60eade3d052bc6ef9099b
font_01_sfnt_off00010fbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBB 17396 bytes
SHA-256: 3b6061729f610ee19accd539be2f65d159feae68873612ca3dff0241538bd4e5
font_02_sfnt_off00013d2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1