Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca187e8abd6e42f0…

MALICIOUS

PDF

67.5 KB Created: 2021-10-01 15:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 28025bcf848e7d2fefd719a9f367153c SHA-1: 7998a887c6063ae67e4c3d576e0b1956e7bee8d2 SHA-256: ca187e8abd6e42f020e0ce61442885286525d803b4cbad6b0357b89c8fea1f52
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, some of which point to compromised WordPress upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://timnhanhonline.com/upload/files/xatekaxusexufej.pdf In PDF document text
    • https://vibanghanoi.com/uploads/files/97592806159.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/tenupok.pdfIn PDF document text
    • https://ienter.bg/files/dojutusabez.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/31830827042.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/wasikalemilunirokeza.pdfIn PDF document text
    • https://websbag.com/uploads/files/lepafet.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/81449454171.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ff58eaf73---bebalolesuvijo.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/kegewiwa.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/dedekalonikow.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/kofotuxulozotejegexup.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcf5669538---4011800665.pdfIn PDF document text
    • https://atlantidegattico.it/file/93980499818.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/po4ke8456thq2ud9ipvonsdof7/rajodeme.pdfIn PDF document text
    • https://eravikulamnationalpark.org/ckfinder/userfiles/files/jiwapalivenuw.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/58935685008.pdfIn PDF document text
    • http://llux.vn/uploads/files/maborizixonulis.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/waxetejupukim.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/78977425402.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+send+files+in+messenger+2020+android+phonePDF 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_off0000a9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA9BC 11264 bytes
SHA-256: aede7c86d102c41d3db5cff3be6283d5cee40d4666eb6223f76e5375a67300c1
font_01_sfnt_off0000c3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C9 14676 bytes
SHA-256: f1612a744dd48d1bb53f49a78aade9d41b2be3df2996b299364bd63b90e856f9
font_02_sfnt_off0000e88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1