Malicious PDF — malware analysis report

Static analysis result for SHA-256 d41d7b3e40ca3a02…

MALICIOUS

PDF

73.0 KB Created: 2021-09-17 04:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ee20e45ecbaf55a4b8b7c7dfd5aa82aa SHA-1: 459ef0d50b5a910990a26765fb8065b374a08e57 SHA-256: d41d7b3e40ca3a0268c16565ca387fde1cb57bd32c08698aadecac9794c4ba79
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://agriturismocorteerbatici.it/userfiles/files/10523884743.pdf In PDF document text
    • https://bilegt.mn/userfiles/files/juvolulewo.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16142858b23877---makepilanato.pdfIn PDF document text
    • https://equalitas.es/userfiles/file/71953733506.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/jixeruxulazowa.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138aa761e87f---86992844222.pdfIn PDF document text
    • https://minjar.mebel18.com/uploads/files/gisivapebovi.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/25709455513.pdfIn PDF document text
    • http://blccy.com/userfiles/files/doraxozowupenixijedusosot.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/funulalavimux.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/8138806768.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/94346128760.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/9151530345.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/161425cc30ee1d---17399100300.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/movuvawijeso.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/98717813708.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/18113416023.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/31607004898.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/fogowoweli.pdfIn PDF document text
    • http://air-ned.com/uploads/files/lanojuwagusepa.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/lesujevimulukete.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/zipazelanono.pdfIn PDF document text
    • http://candientu24h.vn/webroot/img/files/76782216537.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/79227376607.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/82732675867.pdfIn PDF document text
    • http://dezis.ru/uploads/files/rewofuwitimexasavi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=things+to+build+in+minecraft+creative+easyPDF 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_off0000ba08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA08 11308 bytes
SHA-256: 482f2f9e8df8a65b1ceb34174b99f5b9a486ecb36bb463479ba241cf0c0b20b6
font_01_sfnt_off0000d43a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4C 16100 bytes
SHA-256: e997c2c855d8f747bb76bfd5a9141d32e1462899dc0b5d8ff96d535b7b268a97

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