Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c3a12ccf3d76c9…

MALICIOUS

PDF

82.1 KB Created: 2021-09-06 23:27:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b7c228b10e870b3704e508a18dac6123 SHA-1: 34922286dc28178134bbf9b7da95e2dd49c65406 SHA-256: a1c3a12ccf3d76c9c6c0991d61dd9178583285cbd47cbbe0a9acd2495f76f6a7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting, suggesting an attempt to redirect users to malicious content or download further payloads. The presence of embedded JavaScript indicates a potential for client-side exploitation or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://manajrgvaaradhi.com/cms-uploads/files/9627448294.pdf In PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/42596871583.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7fe1489db---xusonaguwuzenuwaz.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/99807909664.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/b065019338e09d21a53e199cbd1d1e76/35535201106.pdfIn PDF document text
    • http://usateatop.com/_upload/files/nebujixexizojuz.pdfIn PDF document text
    • http://standdominica.org/files/files/50184516591.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/d474e4ec90ca5ad16cf5214d1062fa76/geforibizedukidowesigon.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/fuzomotegulirokakunorivox.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823c780b640---88906435296.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/vusonob.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/afg3516s40vldad6ksil861c37/40906470491.pdfIn PDF document text
    • https://mmszke.hu/files/file/negiresub.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/xifevezod.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c4a889763---fofinasosixig.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cb79a198167---66229601900.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/vediwetedaworupoku.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/vokanitesanaze.pdfIn PDF document text
    • http://hodori247.com/uploads/files/5953925367.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/fozolisox.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/57248718118.pdfIn PDF document text
    • http://cutskytools.com/d/files/24088651418.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/63627253731.pdfIn PDF document text
    • https://inverpalmas.site/aym_image/files/figavojonelujuxewokelotop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=sample+minutes+of+the+meeting+in+school+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_off0000d9da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DA 11140 bytes
SHA-256: abdf5170d3e24234d2167a5439e9238237c58e1b8fae97061fe08ebe7d48b5a5
font_01_sfnt_off0000f36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36F 18056 bytes
SHA-256: 5cd843028f9b363f8053673369e4f64804586bc5260902de6c6e2ed3b605d604
font_02_sfnt_off00012224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12224 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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