Malicious PDF — malware analysis report

Static analysis result for SHA-256 40279e1d8b366683…

MALICIOUS

PDF

92.2 KB Created: 2021-07-19 20:28:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: f5030d33e4971526ee4b0ed0e0ebd6af SHA-1: 53c7663fb201896ada79c428e897f342095f61a9 SHA-256: 40279e1d8b36668382ae04f31d4b54a7c362d956e169dc4403959d55bb5a44f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. These links likely serve as a link farm to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c880f5eb70---vagenuz.pdf In PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077ce74345a8---gunoliwofudenuvifagon.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851ac2a4ff0---73371102434.pdfIn PDF document text
    • http://pvvc.cz/files/44131612772.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608716a79b802---2404334775.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/04199c66cd267ad0fac2c1250218a4f9/21014110653.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a35401c9174---88985758959.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/dogibakesu.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4f59cc701---digabobodotivenisuluneso.pdfIn PDF document text
    • http://htwy.com/upload/file/33199409643.pdfIn PDF document text
    • http://centrons.com/uploaded/file/94358590260db95915d90f.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/30345082537.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/54598730416.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021716233808489.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0bff32b67---54099972318.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/1eb7fa7643b55f2f119c575b06cd31b5/jerewafilovomufeve.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/jemaxunipekikit.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/lupodetanorup.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9fd89cd7f---32183333188.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/39011225866.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/kulazefukobogol.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/51823245113.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=iop+for+addictionPDF 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_off00010703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10703 17520 bytes
SHA-256: b60ceb9f77330977d5c9753d6966564b8519fabe33acf4d15722bf51fc5c43e9
font_01_sfnt_off000134c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C3 10216 bytes
SHA-256: ae06cdb77a30938dadaec64609a88457c4eb32c104dc48620ef4510e4094ea25
font_02_sfnt_off00014bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.