Malicious PDF — malware analysis report

Static analysis result for SHA-256 825cedeb9d5ded8c…

MALICIOUS

PDF

82.8 KB Created: 2021-09-15 23:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: be7d116d836370759cf3763d21854118 SHA-1: ba64a2f7bf90ba25d15d1b0801fa76b28eed3645 SHA-256: 825cedeb9d5ded8cbb403c2773a0bd34825efb7282382699bbf1cef8f36418af
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and a link farm heuristic strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/19631686251.pdf In PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/75377330301.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/mamenagurowepenawumobo.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/7a7dd5e7c5af8f534840a7eeff6c9d6e/winagaxeneme.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/9892594780.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/mijavajerizufobasuzu.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/pudunedazabosi.pdfIn PDF document text
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/74767264470.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/41567589362.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/wazibufofo.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138869924a26---nipokulotenunakarav.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/68637979381.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/15550697080.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/gajixosap.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109011334456762.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/xutobifano.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379dec38b24---tipezugigaluneleguva.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/47205331194.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/86018443456.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613d32c75f060---76208047738.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/csdcl0jrt4hoklv3i3juefhcbd/sixusopimupikom.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/32410982744.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/55814542384.pdfIn PDF document text
    • http://chongros.com/userData/board/file/somabowekin.pdfIn PDF document text
    • http://healthywithhart.com/res/file/mifapokelebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=video+x+player+apk+downloadPDF 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_off0000df90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A2 17964 bytes
SHA-256: a0859d6bf949b8efcc8a08bb45ad7587087d1b57719fcae72ba63e3b498554bb
font_02_sfnt_off00012565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12565 10484 bytes
SHA-256: 061b8b53c9744241706b4a551d6449475e483055f88565c64b299b955e2309ec

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