Malicious PDF — malware analysis report

Static analysis result for SHA-256 26779f9fafc8352f…

MALICIOUS

PDF

86.7 KB Created: 2021-09-19 11:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b93224218893e0c8c80cac9341c6e9f7 SHA-1: 3866b9a8e2377c53f5d29f5a50a6291984ec813c SHA-256: 26779f9fafc8352fd45e202d0c21f7af08a3fbfa13a56cbb122e306e64005884
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised CMS upload storage and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware through the linked sites. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://nomylo.ru/uplcv?utm_term=epub+dan+brown PDF link annotation
    • http://bakoca.hu/files/file/sisaf.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/0908879ef821c6c271febcf75ae5d267/46118787411.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/luriviwowe.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210904093514.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/36230934838.pdfIn PDF document text
    • https://pastijptoto.com/contents/files/27349713338.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/54870136045.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/be21c9fbe41756d91414bc7ffd8a8d3b/jasodewipi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136921b4f927---fareleki.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/jotagese.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/74691646785.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bf15d46b0---66392384882.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/31356671622.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/sozarij.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1631534290.pdfIn PDF document text
    • http://villkasz.hu/editor_up/72566596444.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/damojez.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210902111834.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/rebiwurizamipum.pdfIn PDF document text
    • http://artediapharma.com/upload/files/45687826764.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/84193816931.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/39546269429.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/3uo2lnhm2aoinijh1qkl6d0njr/musaxiru.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/74859074894.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cdac0ee46781aef5a1cb27e5b1615136/nalerewidetenulinor.pdfIn PDF document text
    • https://redac.ch/upload/dunerutode.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_off0000ec0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10425 10160 bytes
SHA-256: d824507404326c511923f70706d25f003fc280d4335f8f8d86e42fb21a16038b
font_02_sfnt_off00011ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB0 19048 bytes
SHA-256: d1ebf21abff41dcf39e5f09dd10cc844387121355419073a5639ef56de3efcae

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