Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1a3d73d978f39e1…

MALICIOUS

PDF

89.2 KB Created: 2021-09-15 14:12:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f75c1ab54aca6ce5aab7d45ebc6e44bc SHA-1: 0ae7a8cd0196096f2c2df38009b0243faf8a356f SHA-256: d1a3d73d978f39e1ff3a7e5629c131620ed584e48eb8d924a2e2b81dfef79857
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://conomiya.com/images/uploadedimages/file/zipumusipiwoxotimof.pdf In PDF document text
    • http://yonseri.org/userfiles/files/funobesod.pdfIn PDF document text
    • http://easy-sleep24.de/shop/images/editorfiles/file/39060223873.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/jiropijibofadadojamu.pdfIn PDF document text
    • http://nhatnguyen.vn/media/ftp/file/55640773792.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/82345852453.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/36268679084.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/womurumizisuremotazixod.pdfIn PDF document text
    • http://alothongtin.com/upload/FCK/file/zilukivalejixebudaf.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/006f46c1234cf997c82508a75c44f370/vabijidiwim.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/97181188881.pdfIn PDF document text
    • http://xn--spreewaldpension-lbben-9lc.de/meineBilderAlbertGrundschule/file/lelalujobas.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/ganajironepukinedokule.pdfIn PDF document text
    • http://elitk.ru/_files/84185475060.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135eace227e1---73291458239.pdfIn PDF document text
    • http://begues.mobi/userfiles/file/bebepujivuxubi.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/161402c927d496---tepewenadedasaviwover.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/21836428673.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/dotosawariraga.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/pidotowozesapemer.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/9545224408.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/njr4cm2dg4a69karrko8gq78c2/mugipajesu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=peliculas+online+en+espa%C3%B1ol+completas+gratisPDF 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_off0000ee07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE07 20608 bytes
SHA-256: 0e3aaafb295cc21ac249e650cf27de46c6ea431f8d8d1a01626d28ec53ac9489
font_01_sfnt_off0001233f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B56 11024 bytes
SHA-256: 37b62bff66928308f22f20cfc8d547d48f7e168cf7f78f411d3711c4437f5508