Malicious PDF — malware analysis report

Static analysis result for SHA-256 df2e08e829dcd42f…

MALICIOUS

PDF

124.1 KB Created: 2021-08-03 06:09:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 011831f897f4791108da9f3233a8c797 SHA-1: ff982cb03a61c47b8243d793fea5d6c72d305399 SHA-256: df2e08e829dcd42fca827dc7a3845df85879e37125fbbe832ab97d6fb052a2d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing users to multiple URLs, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9873

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://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d10b54c19---fabazopinukoz.pdf In PDF document text
    • http://abwlanham.com/uploads/files/sefowowufaza.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/fb468aaa8962829c45240a06369a0fac/molexoj.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ccu1l0nnpmajnpt2qon7l3shdp/wuketirisigarofavowafip.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/58264131806.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb89c72957---49122927209.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/1384566040.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/23771258005.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/53589963689.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210618_D972951D44B61A50.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0dd7ca66f---10786439614.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/8404788527.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/40649774231.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddfc0629b99---3198947677.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/tatefoxu.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/90476779363.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/98eb094effa8f31c472a73a65e19c88d/dopaj.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/10025459643.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/gajovosal.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16075d4ccaf4a7---32960766256.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb63f91f74---kawivawideduk.pdfIn PDF document text
    • https://mbbs.hr/files/81862208690.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=aeron+chair+size+cPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016d41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D41 16236 bytes
SHA-256: 9f9c9255c0426c77c5b13ef22f4242f4f7095bfd8ba808a20cf1712cd58ffb40
font_01_sfnt_off000182dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182DC 10224 bytes
SHA-256: 7eef694e648288c88f212b1f273bec8735abccc49c83c19c2a56b2af92a7c3c7
font_02_sfnt_off000199c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x199C3 17888 bytes
SHA-256: aa109e0bb5c0cb193aead31765350e893914ddffcef2ff646a2086e2ec36c901
font_03_sfnt_off0001c927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C927 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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