Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec598021b6fe7ea8…

MALICIOUS

PDF

87.6 KB Created: 2021-08-21 07:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3624ec4d3074b2a8e89989aae4b1fb5d SHA-1: ae7913b4dfefdeec8ad2f0e22282ae2acff5ccaf SHA-256: ec598021b6fe7ea8affc2eb10c067fec2ad5b5b9cc68a40c7118b823a4248fe5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content or phishing pages. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly supports its malicious nature. While no scripts were directly extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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 https://drafthe.ru/uplcv?utm_term=what+is+the+policy+of+brinkmanship PDF link annotation
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/1dc88d4a969b204f2990832d6f2842e6/85971117477.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/doruxemuzubotexazi.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c99976f1---92308995354.pdfIn PDF document text
    • https://lesura.net/userfiles/file/54892359236.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/romezuguge.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/53b3b88a51d42f764de33e6dc5250e94/10860156353.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607db9d837b55---18189838481.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/rb8je70k48i4hc8osvs6aol1h5/nirinilipena.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6345f194c---19175263125.pdfIn PDF document text
    • http://jdhs77.com/clients/58520/File/famusetijulo.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c27fd1f057c---vizomiruvibegizapekuturod.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160757ec75ff90---26589105539.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/vefezisejolujapop.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/kupajamumubisewev.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ad82dbbdb09---bapaxurezetejo.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/telinizilemulozilavozoza.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/vesafolejobofid.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607658c25322c---93189129472.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/wugewekupidejatukexevufe.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/sitotowa.pdfIn PDF document text
    • http://normandyclassof79stl.com/clients/e/e1/e16d7b8530e96d8d426d6b963c92b0b5/File/60445824280.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bce098bcace---83493246843.pdfIn PDF document text
    • http://www.netcorp.hu/data/editorfile/57273482442.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/8unl0g3m86bouk4qq0va0ctjhe/24964308418.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4747dfd13---rizamufopelabikig.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be407ac6ff---70906307169.pdfIn PDF document text
    • 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_off0000f2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AC 16672 bytes
SHA-256: f12e0ba709cc5c47befa9ba08224516b3b7b50368765c41ff2e28142561de2eb
font_01_sfnt_off00011de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE1 11084 bytes
SHA-256: b1fede8a3e498fcaecb8751cd589a2f352e0b7e18ae51caa9d794bdc980b75d6
font_02_sfnt_off0001375c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1375C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1