Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3e4e7f889e2da0b…

MALICIOUS

PDF

74.9 KB Created: 2021-09-10 22:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d9afec548421841223b8ad735d58b4b6 SHA-1: 37cf4dca111ee3f6ae4cfd32a157d0bf68536938 SHA-256: f3e4e7f889e2da0b244455b942f4c9f6323527caba270e5250c2b21bc6b2add6
164 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of a 'download button' heuristic further suggests a lure to trick users into clicking these links, which likely lead to phishing pages or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mcrlclient.gilcom.ro/ckfinder/userfiles/files/kidemujegekezew.pdf In PDF document text
    • https://zagi.hr/files/negifiba.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/66218843029.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613671db895d1---4795308275.pdfIn PDF document text
    • https://digicpictures.com/downloads/tudezoruferuzigoxow.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109051206591990.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/80691355140.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/jolat.pdfIn PDF document text
    • http://wacommerce.net/home/integrity/public_html/ckfinder/userfiles/files/woteg.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/kugupabi.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138ef580b389---46438734836.pdfIn PDF document text
    • http://hitmet.slektenkaas.com/bilder/file/tixutagurapebuno.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c69dd5799---kenemifeviwipoxunirito.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/1160707635.pdfIn PDF document text
    • http://matras-devison.com/upload/file/33779449566.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/novugajimiwurogu.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/37858962536.pdfIn PDF document text
    • http://spakimthi.com/upload/files/52337650189.pdfIn PDF document text
    • https://seikai.jp/free_images/files/41381570904.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/wugorokexutitutegofufebix.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161398408085ed---27560286357.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/90659703971.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/ce842914a256539606dd9aeb579425ea/39918511271.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/37814735395.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/migazimuxajuwe.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/91001262601.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=counter+strike+global+offensive+free+download+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_off0000c200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC200 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA17 11044 bytes
SHA-256: 57b8e421e19600b15dabd7e0129e6e79138067468b7bf241aa3f951e43b764ce
font_02_sfnt_off0000f3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D5 16296 bytes
SHA-256: 05a82fae28e87243dafac267aaddeb58acb44fb5ff502e85644e207ef145cb19