Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e0fd40e5f868f61…

MALICIOUS

PDF

82.5 KB Created: 2021-09-12 04:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0afce3bc45e0e7fedb5a7ccacbdb46a3 SHA-1: 76b4f11b1717f73dbc6ec5dba8bbcd614788a3fd SHA-256: 0e0fd40e5f868f614da0eff00e096ed7998fe769dc1dcd47f448d5328311638f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF with numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://originalcheck.it/public/img_admin/file///32999998754.pdf In PDF document text
    • https://kingyao.com/uploadfiles/files/20210909_095546_9510.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/88708935675.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/febolijeribomiramower.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d394c31e5---80703234562.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/92125961413.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613045c565555---32445564916.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/46888369129.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/11493692516.pdfIn PDF document text
    • http://belean.pl/userfiles/file/fisaxetajupereriku.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/12677043781.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/monevonosuvuzuf.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/48084182544.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/pifaxefibuxut.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/42767205510.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/garefi.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/ribuvoduv.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/telilamefoxibelobikonaz.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/47661338642.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/95152525970.pdfIn PDF document text
    • http://uco-kampen.com/media/files/56526438119.pdfIn PDF document text
    • https://digireg.com/upload/58217172499.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138b7421eb86---91707536863.pdfIn PDF document text
    • https://penzion-palice.cz/content/perevotijorodonan.pdfIn PDF document text
    • http://anpharma.net/upload/files/56215163734.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=app+agenda+delen+android+en+iphonePDF 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_off0000df9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9D 10388 bytes
SHA-256: 0cfed988da4ae56d1f6880d9091308ad66a33cd19ac4c235f27b2d255cb869f0
font_01_sfnt_off0000f6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B6 17432 bytes
SHA-256: b46925c06dcc0c7b8cdb01b2fba167a3785f087e119d1657c0a443304f5c9cdd
font_02_sfnt_off00012433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12433 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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