Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a028f7af0c6a51a…

MALICIOUS

PDF

93.9 KB Created: 2021-09-16 06:35:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8ffab2e0c7886a51b66f34b9d2267a1c SHA-1: c6de77f3d00e3fb0987160e218ac734b228048c9 SHA-256: 4a028f7af0c6a51aa2cbea75bbdac6440ce44e8bc88d9808b2b72078b52b92a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.alliance-educationsexuelle.ch/ck/ckfinder/userfiles/files/94954882748.pdf In PDF document text
    • http://temple.mo/userfiles/file/zojib.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/dofikilapiretevili.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/zajixuvorisiburawad.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2c769d4fd---3039578986.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137598841f46---wuweregagan.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/75722707357.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/66118148473.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/japipoxitodutum.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/jexefinafetokegikuv.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/52734158076.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/78856554008.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/naluxewejutilojesaliwit.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/zeneju.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613da076c67f0---dutunamiwimirupet.pdfIn PDF document text
    • http://mosjob.ru/images/file/zerekenujutef.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10514375971.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161308f7f21703---bozixebazapifepewawewobo.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/febenexatu.pdfIn PDF document text
    • http://clainvest.pl/userfiles/file/28848927672.pdfIn PDF document text
    • http://tfforming.ru/d/files/liviximovifef.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/oh1k1q78qt28g7v0r24s5k5eqd/foxabejosegifiguzuwej.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/lafavazobavilu.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/pizekero.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=undo+split+screen+androidPDF 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_off00010ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADA 18028 bytes
SHA-256: 30609063e20a0f64177a8379460940958aab823c679f6a3a506583e1c2252ce8
font_01_sfnt_off000139da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139DA 10512 bytes
SHA-256: 046aa4a4e0f19828be4ce1d3c7180a8e9c14f9cb490394ffff03efedf46f253c
font_02_sfnt_off000151e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1