Malicious PDF — malware analysis report

Static analysis result for SHA-256 48966f9adc3aa348…

MALICIOUS

PDF

79.0 KB Created: 2021-06-17 09:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 78b53b3c2f82c3b95565dc724318aba5 SHA-1: 07a7c7789204f1816db857f990667a7974db4f3b SHA-256: 48966f9adc3aa3485c6d92f8550bec9d6736012f7924b5eff21e0b52441718e6
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards an attempt to exploit users through deceptive content, likely a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crysiq.ru/uplcv?utm_term=call+center+script+sample+outbound+pdf PDF link annotation
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11825b7c7c---nusuxabipawuzinadefiw.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/24256bf77f968ac0d54aa2081d339607/43371539317.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/03cd9281646c9a084995a5aaecc32ad5/dipebitap.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/wajaju.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16071bd49e9e6f---79600200780.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f4490cc98---kubijuwukuzeledozufebizer.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/b95e16c1b5ce0a08a288f38d6c9f7e8d/70000689678.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/dibelamuwidej.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/vexaxitulebimo.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/rutiwo.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/13425755022.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2570eadd3---86254545456.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/75544890262.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/kixavatajede.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88B 5344 bytes
SHA-256: 4e92bbc4cb07403868c0807d769b520b4b7a9b7e9f792300fbe461dae4f9291c
font_01_sfnt_off00010a98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A98 10668 bytes
SHA-256: 4388997320c98726562680b06554be023f2fb4e64a1283f2c7190f5d2c46ee6b

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