Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa971e4e439c37b8…

MALICIOUS

PDF

69.8 KB Created: 2021-06-08 09:34:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ac04ea3b40e102b42835f2e0c47d3d45 SHA-1: d3e86ddb8455b7b4d5e775cdbcca2575531ee0d7 SHA-256: aa971e4e439c37b8b8d425e76bf08cc0d28587e6a27c0eeea9b275cf28b9c6f2
156 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://pixomot.ru/uplcv?utm_term=how+do+you+warm+up+your+voice+before+singing PDF link annotation
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/i4a3l8of87fpf0di7u7081tr3k/41086147731.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105010055079709.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ad95f1d53f4---93849616692.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7b42b89eb8e1d91c830c72f8e599c51b/fabazumopijipux.pdfIn PDF document text
    • http://topas.lt/userfiles/file/11408238582.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/sudimoruxobelumarejas.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0a7459cde---2709982412.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/31f866be5582f7343e41f24c44b34263/3730201865.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/18505148197.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210528_E844196C55204A26.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/3551d171c0a6db69e9c9728a5ab8f910/lununaleju.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/9hadjccno05k1hfidufjb9mlt2/39547015994.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/bofabubunije.pdfIn PDF document text
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/78141724822.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/toviwojaxupodusalisobapel.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/77b64acdfb53df4a87873539bd2fcc83/nosixipuno.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A1 5796 bytes
SHA-256: 12d997642fa03dd71e4ae430043f0c3198a5a3e3f5d538400a34402308a0ee86
font_01_sfnt_off0000e763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE763 10280 bytes
SHA-256: db4e1d101f699fb7be30498ca4abcb610e3075dcc43e5bc12f54712ea948d718