Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ef743ad82a2b925…

MALICIOUS

PDF

71.5 KB Created: 2021-09-18 04:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ce6f4f3475dc0c2b08f8f494dfb184df SHA-1: 399e78798af455e7d0a5b3d4368af99d461d2eae SHA-256: 0ef743ad82a2b9257da8b81a21bcfe3bd119c4752bc408280a5fb14dbfff9c51
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities and redirecting users to malicious sites. The presence of multiple links pointing to compromised CMS upload storage and disposable hosting further indicates a phishing or malware distribution attempt. The ClamAV detection and ML classifier confidence strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=elder+evils+3.5+pdf PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdd8c08b25---27177803956.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391af996bcc---lifunakefapudugevojezubur.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16130d73a2b498---18122654846.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/xizewopudepe.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/berekefogakadaxuwekimizoj.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/98945760485.pdfIn PDF document text
    • http://harrodsrentacar.com/public_html/userfiles/file/ketexuxuzuz.pdfIn PDF document text
    • https://orangerun.re/photo/files/baxogidazinimidigige.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/97385403845.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/61556895038.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/tijigibal.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c80bc6c6a---dabilavusojoluworimijog.pdfIn PDF document text
    • https://yifff.se/userfiles/file/rijaj.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/wufegovabupunupefimofawo.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210912_1A1961F7720CB497.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/89302899377.pdfIn PDF document text
    • http://cl-pub.com/files/files/migunubajur.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/45587821579.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/80516172021.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/nokuketese.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/gobavafag.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161441811c4feb---56472663542.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_off0000b482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB482 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC94 17524 bytes
SHA-256: 4b6ff21e6f58082e4834cd5e9dafb8aeae6d34f44fd08f37f825b303a77b7b6b
font_02_sfnt_off0000f89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89C 10428 bytes
SHA-256: 2cc6bf7d91a1c3e17911fd098b194c75be74b46c1d67628f530a5a528548b5dd

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