Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7a9bcd683a41809…

MALICIOUS

PDF

86.2 KB Created: 2021-08-06 13:25:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e761ef34a114f5fb22a4fdff432a6639 SHA-1: 2ebd263b8a1899e8abde321fd424514d19b4c6a4 SHA-256: b7a9bcd683a41809bb5b23172ac1eba9ed2a468d71451f6cd6a9f2526cda805a
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple external URLs, with several hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of numerous links, some on disposable hosting and others on compromised sites, suggests an attempt to obscure the ultimate destination or leverage existing vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.amedna.com/userfiles/files/fijitanetarerul.pdf In PDF document text
    • http://grupposcorcia.it/userfiles/files/kawavaforubibemozeravivu.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607be9535ed3f---rajetuzusokafexomitozuto.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/23566094871.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/kodumuvifu.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/lugekitoguzutoxizixi.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/19267104540.pdfIn PDF document text
    • http://thetownsendfamily.net/clients/a/ab/ab79602242cca8f930cd52af13df1d51/File/44926767966.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160877e64ad28b---18269406143.pdfIn PDF document text
    • http://sshs1962.info/clients/3/33/33dcd814b32da85629335a95ab3d0158/File/korugonireposomemapo.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/dodaluviredikufegasi.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/bokefele.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160946f2d7a214---zowapefulinena.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857646ae4e6---tedevuguridijuweni.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc1ee83361---34429231856.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/gojoravoloridotusamaso.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/730e5ee06dc65826d54412364c57867a/25293231961.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/92071205741.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/1964034203.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/jatelovitil.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/kemudotegi.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/wuveninoxeguzekuroxet.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/70056477824.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/87389010966.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/14794270941.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=no+need+to+install+synaptics+pointing+device+drivers+windows+10PDF 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_off0000ebe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE9 16848 bytes
SHA-256: 04d16849626a07230a82f959105a37b2d2e2cbb5363a2b7f74bc2d8006bbf24a
font_01_sfnt_off000117ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AD 11104 bytes
SHA-256: ca463255d4c2b6672c5781fde61263423432c7d820efb95470567596885be3d7
font_02_sfnt_off000131a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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