Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe810e2288d5bf00…

MALICIOUS

PDF

80.9 KB Created: 2021-09-07 01:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d8a8cb2a4902dadc7201819cd1b443b9 SHA-1: 3023cabb0d9d85f1f90b1e261524b389db6a016b SHA-256: fe810e2288d5bf00272b8641a588749c3bf6252fb29b64fe2c82d594964fcbcf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to numerous URLs hosted on compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it may leverage embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://anukulagrotech.com/userfiles/file/vosivekot.pdf In PDF document text
    • http://swaminarayangm.org/userfiles/file/65150851844.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2793b96caf---25894526159.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/068969d3b6860c027095b2e69e065ed7/20903769228.pdfIn PDF document text
    • http://zatexpress.com//upload/userfiles/files/wabinanimafoxikapox.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/1dc8641ba2bba4cb986d0f64b763b369/30010555619.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/vibavafuzoferit.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/eogl2jtd8dfid4a4f38tevh2tf/52612737648.pdfIn PDF document text
    • https://nanosoft.mn/images/content/File/54386923216.pdfIn PDF document text
    • http://douzonebnf.com/upload/file///zolivojizituxuratokalupav.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/kokorulaj.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f34433a71ee---zozovu.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/78242016145.pdfIn PDF document text
    • http://tragadsonisurat.com/ckfinder/userfiles/files/malogudajamakofepiwikifa.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/fowabubomovoxo.pdfIn PDF document text
    • https://sapporopools.com/contents//files/jotomezovemawejodadexu.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a3b057c663---xotatibudisupabaguxes.pdfIn PDF document text
    • https://jagamimpi.com/contents//files/rosobasisigagox.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b44c433a9---lamudafaroxitinoxigugiku.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/3e1aeb9b7a38732aeb86023412afa29d/katavogabatogibuvusewitud.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/94407720461.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/451bd2tt68ngaqaj1m4c2dtqdd/80027167316.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/kipodexotuma.pdfIn PDF document text
    • http://falerisztika.hu/tmp/9350309376.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=lillesand+remote+sensing+and+image+interpretation+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_off0000d833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD833 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF045 17336 bytes
SHA-256: 67cd3a1bb85d01aacee665de2c61f6d252c200d1a89c91d82728107e535c98f3
font_02_sfnt_off00011d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D51 10796 bytes
SHA-256: eda19679edf7cec4f47d2865bb3d87c05980d46d0e2d5b31064c3521c939c8f0

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