Malicious PDF — malware analysis report

Static analysis result for SHA-256 76590d6a4ea29a83…

MALICIOUS

PDF

81.7 KB Created: 2021-08-24 22:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d632fb76cc2e849f2fb77f9bc2288f06 SHA-1: 00a6ebaa21ce4d0210044cfc1fef1f11ff795a2a SHA-256: 76590d6a4ea29a8340df475efcb6e266af31059baa43ccc83a67eb630bac324d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code. Heuristics indicate the PDF acts as a link farm, pointing to multiple compromised or disposable hosting sites, suggesting an attempt to obscure the ultimate destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sincaremedicaltour.com/js/upload/16534571373.pdf
    • https://classykitchen.pl/web/uploads/files/tokikifiw.pdf
    • http://murito.fr/ckfinder/userfiles/files/35583484196.pdf
    • http://agrion.org/upload/fichier/dumudar.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/aeav1ipbpuc7u2cjtfh89sfntt/fenewavikukalomitefe.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/buwaruvibifuxepexufudig.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b30a151304a---34421759861.pdf
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/nufudelerenuragujev.pdf
    • http://techbico.vn/uploads/image/files/pakubenasub.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/e82ed4580637b80ec72fbc0884e02960/91876290928.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c77553e4a8---84718959257.pdf
    • http://namlongprojects.com/images/uploads/files/jazamejot.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ae896a3c2---fenixotigezo.pdf
    • http://irinka.org/ckfinder/userfiles/files/mifisutezoluvupi.pdf
    • http://email-database.info/userfiles/file/wimuvoxafafumadiv.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd33afe4872---sosozofetafumip.pdf
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/b90246c772194bafc558d9c84bccb22e/2762073469.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/mje6kfvjopi0inafl9akqnp82o/18717427173.pdf
    • https://catequesisnavarra.org/guiarte_userfiles/files/nowononixubirexuboxu.pdf
    • https://mimpiindahsatu.com/contents//files/gujupipelelev.pdf
    • http://cukiernia-waltar.pl/qcms/userfiles/file/liwaw.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d32087dfe6---49317946861.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=cheats+for+hoi4
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df19.bin
9466daa817d582d317cac21e8d712df473d85d04fd9c3794e3e4edd1e4cf49aa
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF19 16264 bytes
font_01_sfnt_off0001092a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1092A 16792 bytes
font_02_sfnt_off00012141.bin
55bccef8f87073961317c8175a762cdd825aa1a631caee140b191e03f2f77cef
pdf-font-stream PDF embedded font (sfnt) at offset 0x12141 10268 bytes