Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a638dd14287689b…

MALICIOUS

PDF

74.6 KB Created: 2021-09-14 00:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bd54103ac3f3f484668f86e413c65020 SHA-1: 0d87be6d9b5710f875aac68c1ed042ae96ebab33 SHA-256: 9a638dd14287689bb481fea809fab0b6ff067cde85cbdffbc348258234e39618
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to numerous external PDF files hosted on potentially compromised websites, suggesting an attempt to distribute further malware or redirect users to malicious sites. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd420bceac---20741080909.pdf In PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/86156181448.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/tulededik.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210902144544.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pufosonew.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/16006792575.pdfIn PDF document text
    • https://reha.bg/content/upload/file/setutubibig.pdfIn PDF document text
    • http://talesma.com/E/file/99737368611.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/72542475901.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/dijujawijudujuzamifagak.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/d900aa7744f0e5a85be199e0100272fa/rurebatiwobixorivuname.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/dirodajotusasemubojiketef.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/rerosipasuvewemis.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/65937834045.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16137d86121032---3794139905.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/wobutinuginipasel.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/70929811959.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/dunofakegaxita.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/33965480313.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/79539838386.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/xoneminukesafizalugujeni.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f44205f63d---linejusaju.pdfIn PDF document text
    • http://stringladies.cz/userfiles/34351281544.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/teberikit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=mountain+lion+life+cyclePDF 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_off0000bfa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA7 10268 bytes
SHA-256: 6d707fdc9a8cb9471160a3ce2f39c8b6ecbac58fc5fc32e727e25e8630f767d7
font_01_sfnt_off0000d6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EA 17204 bytes
SHA-256: 29cc9bb4f7d6941aca19830ee8b2e3dab08ac3ab776a0b81235e5645913d3a39
font_02_sfnt_off00010388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10388 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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