Malicious PDF — malware analysis report

Static analysis result for SHA-256 a97985a79644877d…

MALICIOUS

PDF

107.8 KB Created: 2021-08-02 15:15:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8c61c032f5835b8c103a0368cccf36bd SHA-1: 87500fb3e4cf081392a9a0cca68d0f16eb0a7d55 SHA-256: a97985a79644877dcc5194b41443b5e9f53e2bfd473a165592e45d4b288ffdfd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, several of which are hosted on compromised CMS platforms. The primary purpose appears to be directing users to potentially malicious or compromised external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://energooptima.hu/upload/File/17356957979.pdf In PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/9a862e0df0db62c5707aeb523d6660d5/70043162379.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160922409eddf8---jitaduroxe.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7df5ee2e0---30434233211.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/41609542869.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/52418394398.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b156ab4c29---55890891716.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/01c05dba755a9773896155df69309fa7/vitotatabi.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d1d567a14---sizagonokatajakafo.pdfIn PDF document text
    • http://balone.net/_upload/file///75055471927.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/xegamipuba.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/muxudanawagonolomuzo.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db471a7fa0---52390350166.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/labuvejomitut.pdfIn PDF document text
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/76081323730.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/cdcefa30a476d3ee82c2f34839121e38/jolukaviwuvoxokiguvepime.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/turabelujotofojifena.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/739534f3b62a635b2a2eb02b5095e002/48717071142.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4095556ae---3715283662.pdfIn PDF document text
    • https://isleo.com/i_photos/file/solazapulogij.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/86841197008.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/11541414431.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+develop+critical+thinking+skillsPDF 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_off000142bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AD1 16952 bytes
SHA-256: d8bf33fb6085694df3d134fe8322f0b5a70a28283d68298d42a6400983ba9646
font_02_sfnt_off000186b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186B9 11028 bytes
SHA-256: fe3253e5bbd06fefc44e763f4560908176704049649665996dbc48bfcd5d14f2

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