Malicious PDF — malware analysis report

Static analysis result for SHA-256 c08eba8c8b846d64…

MALICIOUS

PDF

105.5 KB Created: 2021-09-08 06:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ca07b51aeb04dfbbb1ca4c04b387e535 SHA-1: cc311ef3cd874fb041365a32dc9e8784a9327301 SHA-256: c08eba8c8b846d64e68c00b206fc5f526088469651b6ed1a5e39584bb5ec0310
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The presence of multiple links to potentially compromised or disposable hosting, coupled with a high ML classifier score and ClamAV detection, strongly indicates malicious intent. The embedded JavaScript likely facilitates the redirection to external URLs, contributing to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/61910013177.pdf In PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/71754506651.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/71327086690.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a214ce8d0cf---jogetuwapitogon.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/68767624630.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/29201291188.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/35733617153.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a8fe8f32c---madukaxawumogava.pdfIn PDF document text
    • http://demkapi.com/resimler/files/kivogubavumubidofukar.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/rexotajesunuliladu.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/93985545979.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/60886341618.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/30266654711.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/90250350388.pdfIn PDF document text
    • http://webbuilders.com/files/file/53557718766.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/sivigegaxasazamubig.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/gewuzifikarefelebo.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/85e1748201424d47a17f952eebfb6aae/29771364063.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a378c682989---bebivufikeveluro.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/momowerowixarefowo.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088d51e1aa1b---finobizosep.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/51421938257.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/kuzejulijalised.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/vojukuvenow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=tratamiento+en+gastroenterolog%C3%ADa+hepatolog%C3%ADa+y+nutrici%C3%B3n+pedi%C3%A1trica+4a+edici%C3%B3n+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_off00012d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1E 11700 bytes
SHA-256: c8b74a3b16b702b048634e0b9efe8e1baf05637b5d191fbeece728e0b962c891
font_01_sfnt_off000147f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147F1 20808 bytes
SHA-256: d58e0cea48b1b43b31d5ccabac203d0b2e3e2d98d6699d45f9cb8610fe997532
font_02_sfnt_off00017bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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