Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba61f281157f9ef4…

MALICIOUS

PDF

75.7 KB Created: 2021-09-02 18:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0c75d21ba48f8b4830ba4e078d11901f SHA-1: bf5f1235c34697275ec572b5fd8280d88121694f SHA-256: ba61f281157f9ef4c6b0e821d0b49afb14a8c17ba69a4c8d4c52f9c5928b58b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised websites or link farms, suggesting a phishing or malware distribution scheme. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the document is designed to redirect users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://pixomot.ru/uplcv?utm_term=parts+of+the+brain+worksheet+pdf PDF link annotation
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/asge19lf5gu54c6kfraiboeq98/nokasir.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/ruvirexiredutiwafuker.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/lazoduputizuzixixawesume.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/ed5e4a7156bab9e9a2a76d96715534cc/sojejanitofilonomagober.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210810000514.pdfIn PDF document text
    • https://facade-metal.ch/ckfinder/userfiles/files/41433600695.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/78dc89682d591a65911684e0d12456be/fapuguvot.pdfIn PDF document text
    • https://bem-sa.com/img/file/tesofuwibovetebozigiz.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/wifazabuj.pdfIn PDF document text
    • https://andana.us/files/files/sobumuxovoxamevimivapowak.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/62328238924.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa217ce55c---87403786165.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608377aa171c2---jugorafinolofik.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/d1cedc33c1aa7f2fd9ad52a5706a51c7/marixevadewafonegojivi.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/20778540034.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/f6d9fef39048a3a6a189e7dc95aa5ced/danoxafimesazolale.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/tigiwokaluf.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baf2b9ecd5e---64004810373.pdfIn PDF document text
    • http://uchid.com/uploads/file/bizomuzijitafaw.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29e19acf21---85518359054.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/m8msu5a4mqb2pm8urjfetiol38/96846680241.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06ae177920---58909013839.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/66940521315.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/99934990286.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_off0000beb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB9 19556 bytes
SHA-256: db3f2d1b8bd6581cc468eccd28803fbac879c6f9aef829acf1927e98cfa9ba94
font_01_sfnt_off0000f05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10871 10868 bytes
SHA-256: aa6b0c4f414c6183b9d0ece9dbf963c9f5a4fa4d578e9f90f5ee0783543ef04d

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