Malicious PDF — malware analysis report

Static analysis result for SHA-256 0191eb3a8544e6f3…

MALICIOUS

PDF

97.6 KB Created: 2021-07-15 10:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c81ab7153b54a2097ef72607987cd761 SHA-1: 5e72d0e6a036054cee8e9162bdbe96794e1e0af4 SHA-256: 0191eb3a8544e6f3a1a4afd14b3a6920b5600173f95188f6102eab44289dd624
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to WordPress sites utilizing the Formcraft plugin, suggesting a link farm designed to host malicious content or redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of multiple external URIs and compromised CMS upload links supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160989f6eb4729---jotojejegurapuxata.pdf In PDF document text
    • https://betalinktech.com/blmedia/file/61803604489.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ef9079334---60911022553.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ed8955e9c7d---2712317412.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/ef172c6912f48edc2e784b09d6d5cf35/2308887147.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/m1u6n6grvqkuplb5aptgk53ck1/71035075771.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd87bbe83e---91988487693.pdfIn PDF document text
    • https://biocoils.com/img/file/gonego.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/tuzefovalusigut.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/c0d96f4d4346d73782a8bc0fea796fd7/1288826144.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/bejokivi.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/11844446393.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160981b61c9996---70446525170.pdfIn PDF document text
    • https://moscowfashion.net/content/xuploadimages/file/kidefedokojo.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe9c229cfb---romakezinorotog.pdfIn PDF document text
    • https://numberonerevolution.it/file/94706570725.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160884e5feeee1---58111472886.pdfIn PDF document text
    • https://tangente-mag.com/img/file/50204542114.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/728c19aa235a8550da7a8774acaf08a7/pazomisepotipefudarugirib.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1608d102dcd575---28977350051.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/rosujopuvaxire.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/kekutebawiragigurewa.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/nribi75683egri46pi4f0tqaqf/fipetipoj.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/25404774645.pdfIn PDF document text
    • http://cke.hk/userfiles/20397345834.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1d5b6fdb4---renomi.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/pigesoj.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e12e420cc8---zosomowuziratofiri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=land+for+sale+in+blue+mountainsPDF 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_off0001176c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012f83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F83 10712 bytes
SHA-256: 430d5a41bf6d11c544d3335acfab9ca6e0affc1314a787cb7742b2ff27b0d435
font_02_sfnt_off0001480e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1480E 18500 bytes
SHA-256: d50e0a8af04261f846cd8bf0803a6fdfbcd631cb27501b7b54333304ad38c446