Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec2a018cfe86370c…

MALICIOUS

PDF

84.3 KB Created: 2021-09-15 09:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 07cd3b0691b0d06fbd03275cf4a80a85 SHA-1: 0472f4954cd47bd453cbceb92f6b1d03444c20a8 SHA-256: ec2a018cfe86370cd0280d2e5c579051485d31c9dad77ba03c61664e7a7c55f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised websites and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of external URIs and compromised CMS upload links further supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://crysiq.ru/uplcv?utm_term=a+technique+for+producing+ideas+pdf PDF link annotation
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138bc8210572---46081486169.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/vikepofugupumajikuzutomab.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1614037b5e7568---siginav.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/8816212733.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dabb11f3f7---tiradubimivakemasezin.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141386d43c75---39036093300.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/musixof.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/ramifuwuzitofig.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/fimeragugifijivege.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/xipiwek.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/rapifoferedejizeketo.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/6063912531.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wimanapawedalakiwedivanaj.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/valapomexakekekedojirijo.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef9d3e5751---21224702007.pdfIn PDF document text
    • https://eklyps.net/images/file/12267339695.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/fiforovi.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/xekojisodovizufow.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413be384c57---34402550387.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/katasijasamalapekumutipo.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/bopesunejiv.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/gowabunufivem.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/17177892463.pdfIn PDF document text
    • http://lumieye.com/userData/ebizro_board/file/95507242320.pdfIn PDF document text
    • 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_off0000e4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AC 11080 bytes
SHA-256: b71b0fa3a0c6db1d8b2c6a351d3e64cc08cf93884311f1fdaf66c2c96b3bb21b
font_01_sfnt_off0000fdf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF5 17676 bytes
SHA-256: 8f1c4b5e149909649ceb29ad61fac35c88a6d7da355b022ee2efbf91eede5493
font_02_sfnt_off00012b84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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