Malicious PDF — malware analysis report

Static analysis result for SHA-256 47d90e4538b03f96…

MALICIOUS

PDF

120.0 KB Created: 2021-09-06 23:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0080ad91809a4b35b52afb973c0846be SHA-1: 27633e219d3a6564ababee5a416a8dff67d44867 SHA-256: 47d90e4538b03f963a8121800ee6cdefeec96f5c43d5e9015ef82e6b01ca285c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9809

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://noospc.ru/SITE/files/editor/file/54666936146.pdf In PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd945522ed---15006341251.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba65f4bef9b---56686473992.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202108161319478896.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/99478162482.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/bamavilimutoseziz.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/ribumajejamutitozu.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844779265e1---wenisiwoxenezafijadegef.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f5f6eff8f---jowanukijumutigejogi.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/84659102869.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/9cdf17dd832633ffcf213595ea52e44e/zadefuguvezirulodomubibu.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/9694599440.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021071002125818.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c0501188e60---lifitagero.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/29347632308.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/2406a39dcb18fd6f7153dccf41b612fc/dipaletavazomizub.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/37748320302.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22693313425.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16081e7ca9ce09---vanokipozegezodobixegel.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/131ic6unc99ulks9bs75c1u760/84778839867.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d37fdc47c---kozusodojanatak.pdfIn PDF document text
    • http://coffee33.ru/archive/file/burejagusuzufas.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/65169de3f641b7c27e887ea03353b2a0/zewogetifoxisuwa.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/44134933489.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=le+paludisme+oms+pdfPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A69 10416 bytes
SHA-256: 621ef83c1b8aa3d62f11f4b6d39432d8caf48213949c72c09656bf28e74250b7
font_01_sfnt_off000161ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161EE 16164 bytes
SHA-256: a0f26d9ec2bc0bbc84dfb8c1a224a49f7f70479ac92e21d726acd811d43f3bd1
font_02_sfnt_off0001778f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1778F 23340 bytes
SHA-256: dc3f1be59e484482919b1bc3388880d11c1fa4c403be7ad8d991b090e82f542c
font_03_sfnt_off0001b0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B0D4 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_04_sfnt_off0001b8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B8D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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