Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4bfe45cea049b27…

MALICIOUS

PDF

80.1 KB Created: 2021-09-04 17:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5d99308f399ae1955284d7152f6a02ca SHA-1: d4ddc44adc40ff1649964429fc2f656c0a2a3f0a SHA-256: d4bfe45cea049b27fe9d5856a5eba6e771245a1930abf144c9fb4b4346ea7a5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be acting as a link farm to redirect users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://keifo.ru/ckfinder/userfiles/files/dapobamolajeb.pdf In PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eb24eet7bsd19ttthbafiqr7a1/vazuwitapipedufibi.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090eebf93701---guxutosazo.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/dobifusudutatigivotasote.pdfIn PDF document text
    • http://artside.org/data/temp/file/77532369100.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/ripugilotukuvawozi.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/43890220984.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/dajitupena.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/e27440bcc5ef09e7f89f25713c22e189/kelapugosomefubunazazeb.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319c7186bae---lokaxamerefebekutase.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/84dd6a45c182b394a249eb25e80b23c6/kafemuxejukimoginiwotema.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f61df6524a---22921436104.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/kowesejokidaf.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ad9c609f7c---28747298899.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/31400510047.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/6a64713cb317ef50e71540e53c6af832/87210694225.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/47dd83cb8a01d3c79a4d9696cdea9cf3/73954037066.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/23707364650.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/22574660262.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/xebisuwupirelaf.pdfIn PDF document text
    • http://sdds.be/userfiles/file/jafevejufeduwoxibodiv.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/notiberufo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=functions+of+computer+system+pdfPDF 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_off0000d677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD677 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8E 10764 bytes
SHA-256: eb20f58fcf2ec7af0da0fcec474d0d28fdf8ca22e097dc2f2921586daab76a99
font_02_sfnt_off00010753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10753 17016 bytes
SHA-256: 6995a5029f495d936eed6084b4b488a96e3ae028389947e59b9b3b14db71f2f5

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