Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d66bde10d2da2d2…

MALICIOUS

PDF

83.5 KB Created: 2021-09-14 12:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6056858a3dc1d31877b8ff71ad78f5a4 SHA-1: c2d161951b8d20aed4fcfdd8c6bd63dc7f42306f SHA-256: 4d66bde10d2da2d28db055c2dc35e55c6739bc1018fc6b73a11701a1a495efd9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://archism.ru/uplcv?utm_term=android+book+pdf PDF link annotation
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/d597766e0ba3611a171f741ba9f01c1d/1164505844.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/75219022023.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/nipekobozutanaketivo.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/kotovekaxelibudijodel.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/vazatoj.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/judolefeke.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/46789171571.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/1997155741.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/2775187219.pdfIn PDF document text
    • http://plafondchauffant.fr/img/user/file/navitizoguzakamofukesinub.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/5835593355.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/palipokoreviditagosokowi.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/62947152232.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/metofobagotitov.pdfIn PDF document text
    • http://www.hro.ait.ac.th/js/ckfinder/userfiles/files/61021374397.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/linijimixuxixetagazi.pdfIn PDF document text
    • http://itps-group.com/uploadfiles/file/66183711001.pdfIn PDF document text
    • http://skmsm.com/userData/board/file/22851021680.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f59bfb9062---totifomasujupoj.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///18376940624.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/43349669408.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb0a61c551---4218407552.pdfIn PDF document text
    • 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_off0000e2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D0 10100 bytes
SHA-256: b0ab7ac45149c741f3971bbbb5cce65483ad8e99a34c0c6016f850dd549e0afa
font_01_sfnt_off0000f916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF916 18384 bytes
SHA-256: 0372da1da45da75b302de180285a4a8639aef5561ef0e5dc746fabaff855c02b
font_02_sfnt_off0001287b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1