Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e2466145ab7809b…

MALICIOUS

PDF

76.7 KB Created: 2021-08-19 07:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4b3c95ad8a54529e8d2bc513513e77d2 SHA-1: 5974667e0b23623d16f762370ffefcb3cab2c368 SHA-256: 3e2466145ab7809bfa12c49188cbb8444d6a598fd5eab87260c38352ba9660f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting domains, indicating a link farm designed to redirect users to potentially malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple compromised and disposable domains suggests a tactic to evade detection and distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://dgjinhak.kr/DATA/upload/files/202106191203317380.pdf In PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/02vds3dsj3eph29t9h1uh8hlc5/mivug.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/f4e104a2b40224f5ef11f32025d58bc0/nitajidibel.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9dcf061d4---lexoxumumere.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608391a92e122---2772937400.pdfIn PDF document text
    • http://hzbaoyan.com/images/upload/File/49024303241.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/lipijuxugutetojufadawud.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3902c64bc---40528385644.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/vimerekegomijakaso.pdfIn PDF document text
    • https://x-software.cz/data/file/tumimugafuzokovoja.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/87078911744.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/ddcacc4ba5f3b9def5c26a4c305279ef/narobibavoxogajofuk.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/270102592196.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/20ikip80flnjo0nglv3u4dnk05/jonaf.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160778b14b4f52---23729603993.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc0263aa12---32262298458.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/161003cc88c77c---badagol.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/fogugi.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/34318562666.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021062304424387.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/34fb1a3d9800ea8ba2eb4f54281235e2/duwotogofubuwenowefivofax.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/b8fcfa90a4a459aaa3c49ef7ca482aca/2976974214.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210621101338757.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=multiplying+and+dividing+positive+and+negative+integers+worksheetPDF link annotation
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/pemezadiwotifobanik.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_off0000c7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DA 16376 bytes
SHA-256: e98d4eb586c84dba2a668285976a176367ccf0468be6f3e8bfb0460ce54b9775
font_01_sfnt_off0000f24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A61 11120 bytes
SHA-256: 60e5a9565a43a5b7010349b0481257dbd21ce708487da67d43db41100f834de3

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