Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccdaab48eb8c8f59…

MALICIOUS

PDF

68.8 KB Created: 2021-09-24 13:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 368024e86ceacd23b28ab012d6b9d9b0 SHA-1: 30a2ad866db7b36becf7fc86911f23d831bb11e2 SHA-256: ccdaab48eb8c8f5903bcbbd2fe3ad071f42b7025d68ec4c4aa61ddac2caa9441
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to lure users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://panova-art.com/files/file/71024263993.pdf In PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/ziwevan.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/sedowasivajigaxuzuvobi.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/62517664203.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143adad62e79---25329346279.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/32303439019.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/85340278683.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/63095442712.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/nezisuwik.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/91cf3705daf8b52f65201919d9ec9d90/44548668395.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/fidafujesiwegiguwavofad.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/73008791088.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/20787169028.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/dinaparujafope.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210917_27B1D7490B34EA95.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/161413bd2ca918---52660750461.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/dorixel.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/37516776541.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/82111942701.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/14008440620.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/26733429735.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/13096340544.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=saand+ki+aankh+full+movie+watch+online+filmywapPDF 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_off0000ac28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c43a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC43A 14808 bytes
SHA-256: c7a9493495c7e25fdb257732c23ae9aebc072ea878fff1b3cada0e2470d7855b
font_02_sfnt_off0000e9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A3 11148 bytes
SHA-256: 6f4322a879759880a778e8dcc49a3c61ace02d15088393cdfd20bcb4fec8165c