Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d279c675e3be3da…

MALICIOUS

PDF

77.6 KB Created: 2021-09-06 05:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 72fe08bc2417661d6cc02f4bb5ced1fd SHA-1: 1aca36ed594eb81f3404faed48ef84a9f10b8cec SHA-256: 6d279c675e3be3da807c233be24eac582fe0cb901c9d3a2b81d05354cf5d020b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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 https://wastran.ru/uplcv?utm_term=hernia+inguinal+pediatria+pdf PDF link annotation
    • https://my-natural-style.net/upload/files/37539369312.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/675993750.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a322a1126d5---45456965651.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/wofej.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/kebane.pdfIn PDF document text
    • http://thegioioto.store/upload/files/virikimelaxulotojavakoles.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/59878115784.pdfIn PDF document text
    • http://jucal.es/images/file/56397943710.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/6949858e30f8d3906631d0e6acf69d89/91648096174.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3a32516f2---9558719292.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/vunixalaxanedufek.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/masimasumavakezumalevoda.pdfIn PDF document text
    • https://basealimentare.it/webroot/files/fck_uploads/File/16920138293.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/liduvezupaguwikububi.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949c80c48b5---wijewuxe.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098e68f116d3---70980044169.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/54430396852.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16132d5b0099d9---12960035866.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/43350160569.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/53141895267.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/0cb125d826b40c22e3ef4d2248a05a07/14458125549.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5a25af5a9---98437273173.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/23245281801.pdfIn PDF document text
    • https://palet-school.com/files/files/10124131986.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/vebiwoded.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/vulekikojawonedufo.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_off0000d1cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CB 15488 bytes
SHA-256: faf6a2402be2e02fd2eec5845f86920b8d886c879f5aab0f8f271b7af9c348ee
font_01_sfnt_off0000f95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95A 10476 bytes
SHA-256: 3b8c0812e0ffd80a78fc56d01ae068433b4d6d90c6e3a0eee7f4e88fd829bca3
font_02_sfnt_off000110f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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