Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d0eaa1a2c0da904…

MALICIOUS

PDF

75.0 KB Created: 2021-06-08 12:29:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 457bd5823bf535d4129eddbc11a4858c SHA-1: 4e2cb4643cab4aff9856db0bc5cd94bab404f180 SHA-256: 9d0eaa1a2c0da9044022d8ef562147c9b5bf64958d38610f6f4566c72808816e
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to exploit user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://synerhu.ru/uplcv?utm_term=a+brave+heart+the+lizzie+velasquez+story+full+movie+online+free PDF link annotation
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071fffa84c6d---fugejetatukasekupowox.pdfIn PDF document text
    • http://ferdavagnar.is/images/fck/file/vusogerudoveva.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/5dcb46df7d799aa89767fcf86569a39e/pakenutoluboxejidab.pdfIn PDF document text
    • https://drvishweshwari.in/userfiles/file/gexir.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/42824316299.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/wigutu.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/aef2fbb70afd512277fc30fc28a3c588/85675796828.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/10481094885.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/4ab04d70f76e12bbf13b6c8aaf00c343/7895642783.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/dejojajarajuwunu.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/55587660045.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/pifevivaserodasewifaxoti.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/a1d3f8f308fc85e1a36d17988cce2986/76527900003.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/c20ca51bc1230611b659d3b4676a93b8/35299575128.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607746e9e390b---30659300945.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606eac2fdc38f---48320905107.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/nitaba.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/52954690345.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD707 5356 bytes
SHA-256: 5b23d9ca973bffd7187532056f7055669804cc72ce18fa80f1085d35a80b75db
font_01_sfnt_off0000e929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE929 11724 bytes
SHA-256: a017f98ef1676a451756466019a2e67a425914bb596abb44ebe378091e480f24
font_02_sfnt_off0001103b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103B 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c