Malicious PDF — malware analysis report

Static analysis result for SHA-256 a92910b68b5dc61e…

MALICIOUS

PDF

89.6 KB Created: 2021-09-13 18:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d598e6f4a7d081dbe2eb5e7ecd3b4857 SHA-1: 7414b3be286b4aad46f21a8a7f65407cd8d2ee4e SHA-256: a92910b68b5dc61e0389451086e40d6b2e079906abd46dd8e4e2c40a2e8e6dfa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://filipdegreef.be/uploads/files/78342583364.pdf In PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/96412058778.pdfIn PDF document text
    • http://thecountryclub32055.com/userimages/70807768418.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/79951333414.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/kisilazo.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/55852814501.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16136c3d7ce67b---ninuvizavofafag.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/pugapuliwasina.pdfIn PDF document text
    • https://everestart.com/images/stories/file/17083198101.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/lipurerob.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/94435859369.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5c1e48c75---kipugodavefof.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/18490689297.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/39781291631.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/rafaligewikoviwomijabo.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210905010741.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/pebeba.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6eba7147c---pedumenuxojokedo.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210905060102.pdfIn PDF document text
    • http://applecentervn.com/uploads/image/files/11383448804.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/kiweragugidudabapiwin.pdfIn PDF document text
    • http://gibisch.biz/files/files/bogozoxujum.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/26303096520.pdfIn PDF document text
    • https://wsbtitan.com/images/file/23750339271.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=temple+run+game+download+for+pc+windows+7PDF 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_off0000f54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5D 19036 bytes
SHA-256: 11472f6809f5c5b4dfb93c2de9e864c5b6fe5f6a897a3d21e186ca430bb1ef76
font_02_sfnt_off00013ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED3 11064 bytes
SHA-256: f365c9dd8efbde44fc27eab12fad6831842ff89cd5bc2797c297ca2f0a53c409

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