Malicious PDF — malware analysis report

Static analysis result for SHA-256 390953974b539462…

MALICIOUS

PDF

95.9 KB Created: 2021-09-07 03:37:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2efc3847cfb18e6c2b6bc855a169a6d5 SHA-1: 021686d8df8acd0459e9b5af6463bc8969c58319 SHA-256: 390953974b539462a6cd17a1186725b9c856eae6d9c3a10ea2e5f04e788437cd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 7

  • 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.
  • 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://timebank.ru/sites/default/files/photos/pagefile/zurojagigeba.pdf In PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/ac6fbf3a90366d0c4c2b31b87efced06/10325876632.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/23162250382.pdfIn PDF document text
    • http://headrepublic.pl/images/files/sanelakakomatolibi.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160853a576aaeb---voweludo.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a45564584bb---51136257209.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/37240771090.pdfIn PDF document text
    • http://www.celso.org/download/56904717649.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/95102519644.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/71595592512.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/48535696934.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/e9048ecd423b056f8e2bc03771e43a67/jerixu.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0eed5d2610---9651128431.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a15448b83fd---bowatimosidikatejafoxo.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/e73104423c7d8d04b6ff424c492867e9/93320651482.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608efe15826ec---zoverib.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/kiliminajewovananumurozu.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1606e5bc1b0e10---lerawumaxuniso.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/beruvolelosagi.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/91951673060.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/73382950675.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786d3bcab4e---69310682188.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/11635632536.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=samuel+johnson+dictionary+of+the+english+language+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC4 18712 bytes
SHA-256: 3b10cd1f2e0b89474d3ea9598d5d09a228bebf0a81125a5c7a90a8d284295161
font_01_sfnt_off00013e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E7F 11488 bytes
SHA-256: 59d2a8b156f038394de29b224956c96333c6c795011ee31c2aadab2f7038ad11
font_02_sfnt_off0001593e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1593E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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