Malicious PDF — malware analysis report

Static analysis result for SHA-256 b163e97616fcca07…

MALICIOUS

PDF

77.6 KB Created: 2021-09-04 11:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7066c9b7dab098d0cfdaaf4d76ab73d3 SHA-1: d2fa16a012cffc2b18ae61e675013d3e8a2f31d5 SHA-256: b163e97616fcca077b8d959386ce8fcc953376f25aaf4b784a27d9bb2f1cb24f
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://holzbau-napetschnig.at/6352961452.pdf In PDF document text
    • http://drivescuolaguida.it/userfiles/files/7180122531.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/mp96ahni44b52jofa6mj3k2250/nalixajugusidirebove.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/kowogasat.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/e58d065f71051152af06d2aa03946e8b/wesukojirogebem.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/26208975991.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/iun9qpqgso1ulolfhmsp482pk4/ronikafovoxifewutitis.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/retukilaki.pdfIn PDF document text
    • https://loyd.rs/images/file/23128181949.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c44d42d3e---pikuku.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/73396530300.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e205bdfdf---xotuluzuva.pdfIn PDF document text
    • https://ms01bet.com/contents//files/14979629112.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/87504680654.pdfIn PDF document text
    • https://stotex.rs//files/35134146737.pdfIn PDF document text
    • http://orhs76reunion.com/clients/30721/File/25304714162.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072cbee8ef8b---kudowikiveponebuso.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/kusubapizopuzon.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/94685563641.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/60418038770.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/ruwofewevut.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/18253976083.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/8a1c48e90ff326d8d61c910153484edc/15282199989.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16124c165a1034---furazerukisosovovegifi.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/dedijopikodobigexixug.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/24034074430.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e965cedc7---21239555835.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bed94b6ff28---boloziwino.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=visual+complex+analysis+pdf+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_off0000cb51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE363 16720 bytes
SHA-256: 8d21c69b1a3fb5f444acbfc647bd70fec534e7795f666aa2f040fdbc9939bd1a
font_02_sfnt_off00010e9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9A 10952 bytes
SHA-256: 6340b436861084af40277bf9d422c97a2d1d9ada1b043522a1e93c52690292ad

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