Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c848897b2b70fca…

MALICIOUS

PDF

76.3 KB Created: 2021-09-14 04:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 814746a189f42efd7b6b539f32eda49a SHA-1: a4da0b59472169fab980af44662599d098f8f2fc SHA-256: 0c848897b2b70fcaa37d08b67b65dd8c3ba448dbbf3c20d5faf860b7379888c9
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress sites or use disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent to redirect users to potentially harmful resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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 https://www.jnvhardoi.org/ckfinder/userfiles/files/kovizodizomuran.pdf In PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/foeqor3p75q6e2auj1bgvb9ma0/37371704377.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/noraxosejog.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/rolonuvozesilivej.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/5566694194.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/nuxusojapetumawaxige.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/40677641160.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/pezajagofi.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/weritof.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f28a6f3bc0---65709584136.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/xixifenijo.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/tepojofapozalolubud.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/fuxojoximadajapekiv.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/23286476077.pdfIn PDF document text
    • https://hse.tw/upload/file/rogowuxafixodiwufugola.pdfIn PDF document text
    • http://abc-tel.ru/data/File/rusuzugexerajalowan.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/lidifiviwelisivozedijo.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/f5snc4lfnqu7vu7go7mucr2t0l/wamimevajakesos.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210911_212516_195.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/rifirofame.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/50181047991.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109060249513506.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/20496143144.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/fcf5e771baec9a93260a51007f6c78d9/sutemaf.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/97061253000.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=live+sports+tv+app+for+pc+free+downloadPDF 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_off0000c523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC523 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3A 10724 bytes
SHA-256: 12f0d3eef04e1c835caeff47fb2d1adc7b9781882f88ce5fbaa569931969ca90
font_02_sfnt_off0000f611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF611 17164 bytes
SHA-256: df82e35e0f32fb76e4eb730e73c03c72e1592a00d25fbf090494021740216b3c

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