Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ea4d72f833c2b1e…

MALICIOUS

PDF

74.0 KB Created: 2021-09-24 10:33:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e82addea2805416786ec4117b5b3d1c9 SHA-1: 73836f6b2d4d1e74df4927a4301d66290cfbbde0 SHA-256: 6ea4d72f833c2b1ebd4d2d646754b819588973732d2678c9babe9b94e825d394
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 disposable hosting or compromised CMS upload directories, indicative of a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://adamlegal.com/userfiles/file/23070858273.pdf In PDF document text
    • http://www.firengo.com/userfiles/files/66885908267.pdfIn PDF document text
    • http://guowangcable.com/d/files/wetobuzudedakujisuzafapop.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/punupabagaledoxedoweduped.pdfIn PDF document text
    • http://www.moyekolodin.com/files/komokifanoxo.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/86393505597.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/xularuwixuz.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/pavalapiwelaluzum.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d43e4b9440---kovutisomavo.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613771334306b---44500751423.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/85013351771.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/34300727112.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/mogesetuvewu.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/78099668968.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/84726615319.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/72219396641.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/870bba62fe06e1fd64d7dd8f1970646e/vagudazoxodew.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/69391797444.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/55906711689.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/10800282500.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/71028197818.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/dawimopodugido.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145022e67f79---14974878429.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/rezis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=prof+reminder+premium+apkPDF 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_off0000bb78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB78 10540 bytes
SHA-256: 203c6622ae408f29125f08c892628c601f8baf290d97c7c41869ad92bff48f21
font_01_sfnt_off0000d36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7E 18120 bytes
SHA-256: 51d9c12843ec6ea27da8d571127b86eccbf82eda03a5d28e931ae3374396337a