Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b6a1c7ad0a31d41…

MALICIOUS

PDF

79.3 KB Created: 2021-09-18 21:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dac08bc491c55fd1e8b4b655173d844d SHA-1: cf3683a6124f07c621c89d60ce8ec853e7fe1571 SHA-256: 2b6a1c7ad0a31d41a0e19db2a0d3f0321a0017dc709d1a9dcb3c01996368850b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed for phishing or malware distribution. The presence of a high ML score and ClamAV detection further supports its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to potentially harmful content.

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 https://archism.ru/uplcv?utm_term=office+356+admin+portal PDF link annotation
    • http://epmresearch.org/userfiles/files/xejozetifuxokuzirugapijoj.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/18269652709.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/161454a6f6c636---roxetarod.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/lonekez.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210908_25AE0FC0C9B4D5E1.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/38f0jq0n1avat5d302hnobnel8/80539973759.pdfIn PDF document text
    • https://ferropula.hr/files/19722082005.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37225558487.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/navejotafo.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/mavupegoligegelod.pdfIn PDF document text
    • https://chambres-lannion.fr/userfiles/file/49300255452.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/ratilato.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/livasuzez.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edb46007a0---22256145636.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/83851155784.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/72132593482.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/u94rgldqmkka360rvnmai89s32/wimupomulegasabuj.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/tamokorugelawigasevudiwuz.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/91434531539.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210912175242.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/161334eb815104---63830462520.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/riporipububusizilisibefun.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_off0000d0c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D9 11112 bytes
SHA-256: 82d2107660e028901b65bdc36584e8096f8aa969faebc4bf743368efb82b17f7
font_02_sfnt_off000102c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C4 17732 bytes
SHA-256: 66e2bf636b685d68eb1f19d857cd8d8d1992fd313bd27da42e7005eb67c4ea58

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