Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e55d0f4bf7e32d0…

MALICIOUS

PDF

82.1 KB Created: 2021-09-03 04:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 35cb6a82e938e74c30d197fcdfd93335 SHA-1: 64e7cdf9b1953199e44c4cff1893eb4ba5fdde59 SHA-256: 8e55d0f4bf7e32d0520484967320a09c1ffe22c249a89edfff900eea41239cf4
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple websites, several of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware distribution sites. The file's structure and URL patterns are consistent with a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chongtham68.com/app/webroot/uploads/files/guxojuzolivilezi.pdf In PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074814c92a55---jemavuxeliji.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/37893456685.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/16750535840.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/74087913027.pdfIn PDF document text
    • https://majubesar.info/contents//files/banapil.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/gorisi.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/mm13l1hb8bvv3jgfe44k86ab1r/mabupig.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/vivusaboketopopofemifo.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/tudasa.pdfIn PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/kosamelejep.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1f79bd261b---76232520580.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/nelizolapipoz.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/sofakel.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/50813520829.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077aa0065e6b---pirutalukuwewudigidox.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/72461563131.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29190961508.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/xuwufetimivuw.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/fujivonowoletomamuz.pdfIn PDF document text
    • https://irantruck.ir/data/file/vukinelore.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/43688150390.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/6g4csvqdc7fjmgehrlfq9avrt2/64539418038.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/monoxemonemugumidaxumeju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=math+worksheets+grade+12PDF 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_off0000dde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE2 17040 bytes
SHA-256: 0736ce3d0403a48b0a750ef6b3dbb79015b6e94c79d3e01cc50d47786ff0d9e8
font_01_sfnt_off00010a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5F 10628 bytes
SHA-256: 8ce20863a697cfbc30bd82e97f9a7cdc5dff6ff80d44f93c5bfbcf4cf0a17069
font_02_sfnt_off000122de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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