Malicious PDF — malware analysis report

Static analysis result for SHA-256 cad0e19f4796d7ce…

MALICIOUS

PDF

129.1 KB Created: 2021-06-30 11:41:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a458817ddec03d06be3c843c0d7fa981 SHA-1: 01580f740e8a6d4a2dfb6e1c35857d22cd8c7ee6 SHA-256: cad0e19f4796d7ce81e83d89f03a990a69c19c8552ae53aa63099cc9ab2c37c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of links, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://coretry.ru/uplcv?utm_term=source+of+noise+pollution PDF link annotation
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/986e2c02e3f355336e6df6beab289b1b/wikuvebozifuluwarojize.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/1734352649.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/995h5bcq0fs7scmin6r590nn29/pogibuwedikerebajowaf.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607803a1c1ad8---50440244583.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/ri82ol8hsfr78vmr0iss6t0ab9/84559077825.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/ragepobimotefo.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/5061b6bbde7f5c8a6d7f74e2f6a25031/tegavisowatukexikisi.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050904341873499.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7010bad792---jegepapunigatupuwutaperew.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/24070316788.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/1d76996189b33b7c52882afd2fc16e45/kisowegawufokolobopojili.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/1k3q4uchsj0k4kv8lcliqqdkjr/26454805630.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/lesofoxefajotigavuj.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ade051a073b---xanute.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/xokikuviruwuzubela.pdfIn PDF document text
    • http://falerisztika.hu/tmp/keneg.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d87904b97a---86594802203.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce8ed5e6dd---xizejakuzirubadevavedetu.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/4549bc2bc1e1bd8849c84dcadbfc8878/73881179095.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/f4ba843ff5eb7529862ee56fca2e2e3b/79727428865.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c67b21628a---20034996056.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/eblq21iffq6vpobfa92hdtjdil/nuxaturawowo.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/52adf0c7136e5b63d183e9f7e42c6629/gajawavaxurefije.pdfIn PDF document text
    • https://doganagolosa.it/file/21332691957.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c51c321be8f---1161497395.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_off00019439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19439 10484 bytes
SHA-256: 22f4b37501af9094b2e6d4bd0051784a638175d7555cbc0041a8dd51dc61fc79
font_01_sfnt_off0001ac28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC28 19500 bytes
SHA-256: 13642df4431a01978bb7a40d1c44055b72ff34e98748b301ee36f60cce64548b
font_02_sfnt_off0001de4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DE4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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