Malicious PDF — malware analysis report

Static analysis result for SHA-256 057c863ec2eed9f6…

MALICIOUS

PDF

69.1 KB Created: 2021-09-02 03:01:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 149deab5d4d68d25e1bb16c43caee4f2 SHA-1: ce15eb19b9c080661ee0955d222574b2ee57d707 SHA-256: 057c863ec2eed9f625c18a0fc547f9e6c5b1790b24d06426ed73449ba23b2e27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_URI' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. While no scripts were explicitly extracted, the nature of the links and the overall structure point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://laborke.ru/uplcv?utm_term=make+secure+pdf+unsecure PDF link annotation
    • https://marosme.ro/hirek/file/basokadivuso.pdfIn PDF document text
    • http://drhkltd.com/upload/62409821312.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/74268750409.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/31c405140a1f4cbb1744080a7ad9bdec/67266402167.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8624bdaa79---mifipafawajoketisimobi.pdfIn PDF document text
    • https://yam-token.com/business_school/uploads/file/xenukeli.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160998762c76a7---tagumapusalironaradavasi.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/aae6913a278492a2c7e6cb3a61ecd00b/rekasorewa.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/cf9c3f1503e7be3214c188ee7427301f/tobesijififazumuto.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/63016272761.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/lasubinupifeja.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98371aa6d---97992044291.pdfIn PDF document text
    • https://airbays.com/userfiles/file/tanupefejapi.pdfIn PDF document text
    • https://drvishweshwari.in/userfiles/file/38163345435.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/82627477212.pdfIn PDF document text
    • https://chogmai.org/ckfinder/userfiles/files/52828422603.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/28148409968.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/vijakuxikokexidojigek.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/3p9ap5l677ps6ccpmjtgn0soka/tajokuraf.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/wolewakelotixivorukop.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847a92ddf42---xonatepolog.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160912aad0500d---83918095226.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/zoxinezuzinabejujo.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_off0000b23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB23F 10444 bytes
SHA-256: 9e5594d361da5980c27a8e694108591bcc69643e6fc157e1d2ab83e8758f8373
font_01_sfnt_off0000ca11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE223 14848 bytes
SHA-256: 0060a1cf85beee1109d7566e6a586f7e302de7ca45137089952bd57dd952e92d

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