Malicious PDF — malware analysis report

Static analysis result for SHA-256 c783f5f482233bb0…

MALICIOUS

PDF

88.7 KB Created: 2021-06-10 02:19:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 82444ca6a97deb4fe78eea78bb77436d SHA-1: 360b3095cc9cd40773d2980e17c5d3d79204d826 SHA-256: c783f5f482233bb0e399da4d32e49abaa9513f800a12fe4378c54922aac6e51b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing campaigns that leverage deceptive document content to trick users into visiting malicious URLs. No scripts were extracted, but the overall structure and URL findings point to a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8399

Heuristics 5

  • 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
  • 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://irlanc.ru/uplcv?utm_term=salesforce+lightning+platform+plus+license PDF link annotation
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608835691f1ec---52119980255.pdfIn PDF document text
    • https://webmenuplus.com/images/file/ragora.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c063ea1ea---numodasuper.pdfIn PDF document text
    • https://retta-bg.com/userfiles/81348479311.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609469ade0a70---biduterepazomemituj.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210607204242.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/16fbb728f41768fc2edb7bc7da2756a2/80913632358.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a43000c0c---wimurezimafoz.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/vabamenidek.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/chnql0bhp1eo0bm1qbabogkkr4/13414859691.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/vekipesozivugitejebas.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce9044b6ca---levijavuranuzotokoxi.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc005191e9---27227597300.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e517b8819---vakiluninopafupoki.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/f86a6d966f6cd862f528250758702790/sozemumoxaritenebuwopa.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4ba5e473e---73962347419.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d79f1ab2b---sabejonukomapoxadij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001436a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1436A 5532 bytes
SHA-256: 3c970fa97ce6b2f41a8e4faf1d19fb58a3744cec895c05881be1384368f8345a

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