Malicious PDF — malware analysis report

Static analysis result for SHA-256 a428ad040a07d2c8…

MALICIOUS

PDF

69.7 KB Created: 2021-09-26 19:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 215fd2d798e72e71461f8f508ca8a5c3 SHA-1: f5b8c902673c6452d452f10aca95b38c7eb6a92b SHA-256: a428ad040a07d2c8f20c2cc2b7e2c02d10702790a5aeaef95851d235bf45a1e2
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple disposable domains, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://hirurgija.me/files/zuwudugofovoruta.pdf In PDF document text
    • https://wickedcheesy.com/images/file/62825347032.pdfIn PDF document text
    • http://quaisetoiles.fr/img_pages/file/midofugunobasixawojara.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/tirutasapik.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/zikidawarasewasekumoxiri.pdfIn PDF document text
    • https://clickbox.ro/images/file/98183912684.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/c3kakginkfhmchgqq4lq1jnojn/molixevarowabej.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/e29cad64ed72cce9c0aa3cf64deadec3/94567458532.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/xesumasudewibe.pdfIn PDF document text
    • https://hgb.se/filer/file/gapalibusa.pdfIn PDF document text
    • https://trystsalonri.com/images/file/45773277831.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/af633b59d038a73737bc351a2e9391bc/34113373785.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/kazigejapiwewareruwibosoj.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9c87c0560---welitibumapiwimufowisine.pdfIn PDF document text
    • https://pisausakti.com/contents/files/rujet.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/rugedajajoba.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/85466043209.pdfIn PDF document text
    • http://millecolori.it/images/file/83750400448.pdfIn PDF document text
    • http://morakothotel.com/file_media/file_image/file/tebonubisejavovizow.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/xivetodo.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/lebateriduzo.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109210724563982.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/jidalix.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/86702115682.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/viluw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=is+it+possible+to+see+who+viewed+your+profile+on+instagramPDF 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_off0000afcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFCF 14448 bytes
SHA-256: f4d69581f9f9fe35477ece0f9dba35cb6ba20b93ab07f37aaa27e124584d546d
font_01_sfnt_off0000d43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43F 11400 bytes
SHA-256: a4520f57505516bce606b3d678835985180e7d846904d5705676fa2c67075ece
font_02_sfnt_off0000ee96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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