Malicious PDF — malware analysis report

Static analysis result for SHA-256 72fd99dbb2983f52…

MALICIOUS

PDF

89.0 KB Created: 2021-07-08 06:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 13f29f68a78bbd89863828b1fa032cde SHA-1: cbbfcc848c56b6275524a8085c1927b136ec0073 SHA-256: 72fd99dbb2983f52119e08b453b66e45a873e6784e2c085e4d56cd5d9a321420
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan lure. The heuristics indicate it functions as a link farm, directing users to various compromised WordPress sites and disposable hosting domains. The presence of the 'SE_MFA_LURE' heuristic strongly suggests the document is designed to trick users into entering one-time codes or approving multi-factor authentication requests, likely to steal session tokens or credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://sklepjola.pl/userfiles/file/deninove.pdf In PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d553c20d507---kudodedipunejebututa.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8c8400b02---dagokon.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/lukoxaravezas.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/7359418faada8ac42d264291469c080e/tovipanitavajipimekowor.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608734e0c2089---31680692304.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/12776721838.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e453bca976---63697216737.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160950e646b288---19627355114.pdfIn PDF document text
    • http://jar-ted.pl/file/sujogo.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/f42bda9d4a04660383aef673cbdc9912/sitetisunisavigeg.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a088960d18c---98421473042.pdfIn PDF document text
    • http://wamer.org/userfiles/file/49751750930.pdfIn PDF document text
    • http://jfkanacon.org/data/userfiles/files/69589480325.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/48efcd02342ce39d70f41002c667ddca/66729709206.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/nb2svoiose3iut52c3g8aelrn5/34734997200.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/63345487297.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/38284382273.pdfIn PDF document text
    • https://appfacile.it/file/kodagaxuroranavamuf.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/38fb225807f7a9c1f5cb3b55fc3a469d/41973926700.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/12219686906.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/44516579386.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=find+that+adPDF 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_off0000ff18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF18 9756 bytes
SHA-256: d564ec22e0d01d3d47ddf013b63f6bd092c6cc5b6557c2111b661b8a22903f25
font_01_sfnt_off00011432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11432 16524 bytes
SHA-256: 010bd7be6ebd39ba8c05ea3f7af7f24822e1295cb3ad33fa9a074957e58af467
font_02_sfnt_off00013f06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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