Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2f2f743cff591dd…

MALICIOUS

PDF

68.5 KB Created: 2021-09-25 11:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 053ffcfe1cf48e6847544f5f5a27e3f8 SHA-1: 540b0c486f1f9d1feb0da6005db9467287fc6e8b SHA-256: f2f2f743cff591dd4a2a2f53a824d8ad8eb698c6ea34c992cfdee36775e12c8a
156 Risk Score

Malware Insights

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

The PDF contains a link farm, with multiple heuristics identifying it as such and pointing to compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs, such as http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161367ee03151e---webegijuje.pdf, are key indicators of this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://xaydunglenguyen.vn/upload/files/c3d98e.pdf In PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161367ee03151e---webegijuje.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/89260318095.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/4304784508.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/pojutawewikesepedomafom.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/nezixexefutude.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383324206d5---26847246319.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/33571410961.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/83922572983.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/74566205404.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/wadogoxupojezolife.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/vanakeziju.pdfIn PDF document text
    • http://osayit.com/images/file/tedulumirodebunurumiw.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/20332512917.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210924183714_ug0jlo.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/riridakego.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1614b3ea34b490---mawowagikaresadotup.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c9fdd460b---79450517794.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/73190377670.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/zetubemirazurun.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/zusaxurolakobudafefa.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/14747354052.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614028fae71e7---78028825881.pdfIn PDF document text
    • https://parc-hotel.info/file/nefesenalegekar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=fifa+20+app+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_off0000aff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF6 15120 bytes
SHA-256: 7b6153598aa81e6ce061715bf7ccfdc3294bb29a619bbf26011d48df6cb32b32
font_01_sfnt_off0000d5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC9 10264 bytes
SHA-256: 7e35b1e310abc6afa7175d296ab2981c75dbe158203f83f07a080a8edbb7453e

Open this report in the interactive analyzer, or submit your own file for analysis.