Malicious PDF — malware analysis report

Static analysis result for SHA-256 59dc8bce5e578974…

MALICIOUS

PDF

98.1 KB Created: 2021-08-05 19:18:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 767ed1e91d0dfb6a340bec59bece3871 SHA-1: e7e6591225955af884a87a67937fdc1f98f6caff SHA-256: 59dc8bce5e578974646c11ad113ee695cf69fe30b77ea48ff85a31cd55b6ac43
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites. Several heuristics indicate the presence of link farms pointing to compromised or disposable hosting, suggesting an attempt to distribute phishing content or malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • 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://huntic.ru/uplcv?utm_term=how+to+apply+online+for+woolworths PDF link annotation
    • https://producedepot.us/userfiles/files/50112686255.pdfIn PDF document text
    • http://bangkoksolarpower.com/syner_upload/images/files/48713294964.pdfIn PDF document text
    • http://stringpoets.com/userfiles/file/wagadob.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/kerojagubuxoxapomibi.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/96005339607.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/e3fb5fe4b036aebe225b4ec515dc30dd/55859526721.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/rixemikeb.pdfIn PDF document text
    • https://technische-dokumentation-hoffmann.com/upload/files/18829230899.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/geforebapakapupoja.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/tatedig.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/37992860804.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c58b6561b82---74906737630.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/481b852b84d8c8408385e03ce0864978/83103436502.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/80317153959.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/46339778136.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f75651ef2---lidojawenusixitu.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/2d3339b268f36ea7b10f63b2e52930ef/wazowopisiwavolisopi.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/giuoikm10m8tr1eoen2l0eu1c7/28760757760.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b0d1e6026---68542437734.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/5i54argupi5kqo559873f0a6f0/1557921943.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/dde8efcf55e7541f8b655dfc7ffbf59f/nexovawuzurenaxupogexe.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d3773290553---vuvuzupufasulew.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/6d8ecc0e9e9f8b9f82a7f25c172aef18/gozuvowanegab.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_off00011e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E51 16944 bytes
SHA-256: e31d0302c37d00ada38c114bd4fcb37646ca22444e71e76cd9c077e82dc9a445
font_01_sfnt_off00014a63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A63 10644 bytes
SHA-256: 81d5d8d9effb9284a0e9453570fedd399b4f5d5fe347e28d74c643c8ed1e6a0c
font_02_sfnt_off000162c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1