Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e26ebad2987a20f…

MALICIOUS

PDF

72.9 KB Created: 2021-09-05 20:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: babd4000664e4233f1168f326e3e5313 SHA-1: 470b9ea0071bd4fe7e1ca104339ed55fa9197dea SHA-256: 4e26ebad2987a20fc352ac4cb8b74f7114072433f6811db0d05c8ec8a8ea5adf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/39hc83f4dnqotmbbnadtqkpdc4/vasejebavu.pdf In PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/60013864435.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/89007689385.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/17703638487.pdfIn PDF document text
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/54434323415.pdfIn PDF document text
    • http://edgecs.net/documents/wilorejotamisop.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb090c3f92---20366189682.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/fuzaximofinufisawedozeza.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/kujiwaziwapupole.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/h00dbdlefmnp952556t47tcei9/paxanivapejegedavonoguna.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca7f234099---47569170774.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/f349fd76f8dabdc8d8ca3051262f6825/29154479091.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/n2i08sim1bm0hpo80n3gjlmj6p/70144618701.pdfIn PDF document text
    • http://suranareecommand.net/UserFiles/File/tipudekuroverupivuxowaj.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/tuxebowesavidadajesez.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents//files/617021818.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/20172029631.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/0t8hs80i65bd0opv774cbtdmql/86486175789.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=minna+no+nihongo+part+1+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_off0000b2a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A0 20308 bytes
SHA-256: c8a705479a1f643a8aaf287a41ab192983dc5742d3fbe8372672583752da25c8
font_01_sfnt_off0000e732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE732 10476 bytes
SHA-256: 4cf3e78d0a5f7b97b03ab6fea3d8f96e7b9e2317840ef872855b3a751ea758d2
font_02_sfnt_off0000febc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1