Malicious PDF — malware analysis report

Static analysis result for SHA-256 614c052afcd0de18…

MALICIOUS

PDF

70.7 KB Created: 2021-10-01 02:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0d2c3c07bc206a53c63fc04c989c98b9 SHA-1: d28c2d73f87034b4b13038d36e1eace0611b3a78 SHA-256: 614c052afcd0de1802f9b902b2cff5ad091dd0efa7fc5f70aeafc1eced6ee277
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised or disposable domains, 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 presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://styrexon.cz/userfiles/file/bulizapavate.pdf In PDF document text
    • https://promenade-perpignan.com/userfiles/file/wogof.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/nopit.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/tevusupoworevujov.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/topilofiposibijiwejob.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16142039a7a333---jesurala.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/26211676899.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/76646217354.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/morolapikafa.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/favonofobopuzimidewokogek.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/kosibudanasezaxenarotofof.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/pizopoxaroxasaruvozerewab.pdfIn PDF document text
    • http://camonetinternational.com/files/file/zasomepopomerobuxewujafes.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/2711eef9bfc61fd190cd722634d3a5be/kexuxifel.pdfIn PDF document text
    • http://opgzvh.hr/upload/file/rudexekubifoxujotal.pdfIn PDF document text
    • http://redactron.com/userfiles/file/35018377437.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/91825573004.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/74111195227.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/2069740638.pdfIn PDF document text
    • https://btegypt.com/file/femirojuni.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/dofonoxumuveb.pdfIn PDF document text
    • https://limsurdua.com/contents/files/vozinimekivadanul.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/kg4hsv62n12bo02nofs5n1b4hk/78139493225.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=names+that+start+with+h+and+end+with+rPDF 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_off0000b2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2EA 16436 bytes
SHA-256: 8259413d2d5e7fa5f0b65510fcdf5d6d7680f020a5b22dbdcac1fe036a462757
font_01_sfnt_off0000dd5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF571 10412 bytes
SHA-256: 89bee257b9911c1ff131781d887ce8dedcefa578bc69d78dc91ed2c514f32158