Malicious PDF — malware analysis report

Static analysis result for SHA-256 33163a1aac57d596…

MALICIOUS

PDF

79.0 KB Created: 2021-09-07 21:32:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5bf580cddbe8feed9b17a62b3349d1df SHA-1: 02f9a90589eef699c1fe2ebf3e6e453279986062 SHA-256: 33163a1aac57d59624d0b47d8469509aab738af7f4b66a2f65a497ce547ce506
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites, as suggested by the PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, which point to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nomylo.ru/uplcv?utm_term=super+mario+bros+guitar+tab+pdf PDF link annotation
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/a22brrg7aav9e51vejkqbq1su9/22764426306.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093caf71cb6b---2639031834.pdfIn PDF document text
    • https://dineflon.com//files/16784650182.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/8646192060.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870fd9bfb86---novemuvamozexubemogefov.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160e667d66463c---dexutijeraziwaxob.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/32791397871.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607900f2ad6be---nuxomikuwigetuzuneboxuf.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d68a1a783c9---nerixizikigetufo.pdfIn PDF document text
    • http://suncreekpuppies.com/clients/8/88/88daaab1104cc9784d9cd8b59d189b35/File/bobizawumapovemote.pdfIn PDF document text
    • http://szjg.hu/images/file/pididatibowezubapo.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e21d41768---wanamekazofotafe.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/57531133998.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/58081615305.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/55686553603.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0f1c593da---36851788078.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/fisenuv.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160eff52b5bc1f---dojopetamimula.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/47199854912.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/84861104872.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210829002122.pdfIn PDF document text
    • https://zzwgjx.com/d/files/rawekesosabusitubukit.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/26judkjramuiqtlcofccckf2bt/243683309.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/11037891110.pdfIn PDF document text
    • 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_off0000ce0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE621 11004 bytes
SHA-256: e1e06851a9293b36ad4ff17c6b6b9a2f864275bfb8f6f9d8381742442fcc29ed
font_02_sfnt_off0000ff47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF47 17848 bytes
SHA-256: 735d2506eac0c5920121c7ebd602e9589fc069802c777a43d303b59e5972eb24

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