Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d20d026e00ccaff…

MALICIOUS

PDF

76.7 KB Created: 2021-09-06 07:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2bc3259a662efa8e83c1c57bbaf3c8bf SHA-1: a0dd44220c9fd912f60dc3c6b5e9ff9706f6c832 SHA-256: 7d20d026e00ccaffb4ba859773e5a0efd403bff7459dfc6b4e63aecaecd7663e
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links indicates an attempt to lead users to potentially harmful content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://banhangcongnghe.com/upload/FCK/file/79108743654.pdf In PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160902bdba2b56---fezuruvusaz.pdfIn PDF document text
    • https://bem-sa.com/img/file/2059013959.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610472b700ca1---ridexinu.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/53275773721.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/b1e35d42f1df4a43dd3d7ad63cde29c7/49898395291.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8387b9030---fikulebajuzo.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/mukabiwudik.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/29507944287.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/talagigadexa.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/goxanatasid.pdfIn PDF document text
    • https://sanagustin.cl/files/21425697945.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/9mhnm753ohbua7q5tqjkiq3rgu/dijagodu.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16072ffb53395f---58919643072.pdfIn PDF document text
    • https://laser123.com/geektic/files/52017993980.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/wizipijijiwujofaxabidit.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d7f9474c310051d8a7d67d5e9438e85b/17137446889.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/gemebumepegamowugukebu.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c75686d87f1---14325478598.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/ninepotabaluvawazuroni.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf9e764ed2---28321639955.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/6070801373.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607560dc8b09d---35795834088.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/74467619239.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/bikuwufijumezebal.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/80701270990.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=cours+physique+des+mat%C3%A9riaux+pdfPDF 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_off0000c3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C7 11260 bytes
SHA-256: a7ff8c2f7e86e578ac5eabba106782b712b0be24f7708f9af2ebbd2b56edae47
font_01_sfnt_off0000ddd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E4 17924 bytes
SHA-256: 3844514cafbfc336216c00271f4470b8b01c588eea93361a7a77c1717750f2b9

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