Malicious PDF — malware analysis report

Static analysis result for SHA-256 e49a0282a36a6604…

MALICIOUS

PDF

86.0 KB Created: 2021-08-01 11:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: be969fc562b742655bc50772c3268e22 SHA-1: b9cf8afd48603e036f684f9c259477cc145c3929 SHA-256: e49a0282a36a66046ac96295512b0758b8428d9a5053ab72d082d5ba26872a02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress upload directories and disposable domains, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://vestol.bg/files/file/18227906630.pdf In PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/32124721015.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082aa9cc6def---68729399372.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021072605062473499.pdfIn PDF document text
    • http://slpclassof67.com/clients/45391/File/5874074612.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/4458195837.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/fekedatokimak.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/67405079466.pdfIn PDF document text
    • https://renault-service.com/userfiles/34880721881.pdfIn PDF document text
    • https://actorconseil.com/files/file/94108265884.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/70908920041.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/sajuwaxexivafevusezopof.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/movalexevakatuduworekulo.pdfIn PDF document text
    • http://turnyras.lt/Files/file/591281981.pdfIn PDF document text
    • http://dgjst.com/upfile/file/foretubifetedalisi.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/69ccf1858a3d9bdcfeeddc8d779b0531/deviso.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/diwoxuwerov.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/3210bfdc0eafbce9c512f0a36eee2fba/dezesivajomufaxurusujaju.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/59582701617.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b49c6263698---66069949782.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1d2461f4b---76166706421.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/88619621257.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/vikibiragemep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=internet+explorer+windows+7+free+download+64+bitPDF 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_off0000ea61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10273 17712 bytes
SHA-256: efac2096fee6228ed81c693ed57482ee417eb5c612d0be0c93fc8bb79f35cfa0
font_02_sfnt_off0001304f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304F 11064 bytes
SHA-256: 2e380833c1be2ac9c9c2df06bec94633f8df42f6754ca60704d2a3368218650b