Malicious PDF — malware analysis report

Static analysis result for SHA-256 611fed4e8c437191…

MALICIOUS

PDF

68.2 KB Created: 2021-10-02 18:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6b70bd5027e9e8b26dfd84c9aa6d0d7a SHA-1: 8fccc29e552d6104148daa0f938dffe44d8916f9 SHA-256: 611fed4e8c43719156bebee2dba86023ee940fcdccba24eae45b27a9e360bb78
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, multiple heuristics indicate the presence of a link farm, with several URLs pointing to potentially compromised or disposable hosting. These elements suggest the document is designed to lure users to malicious sites, likely for phishing or to download further malware. The ClamAV detection further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://papaicountrylodge-longstay.com/user_img/files/43954304356.pdf In PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/20054901360.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9a0597e58---ribamavunumewovosarebilad.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/mokopoduka.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/4622856214.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/difatujupis.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/lidebubifexipubexatur.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/teserin.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/65140058747.pdfIn PDF document text
    • http://specialcats.nl/media/files/pinogoje.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16141138c7b38e---53349957313.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/rikunotu.pdfIn PDF document text
    • http://sibmaxi.ru/userfiles/file/nojugirimemutukuw.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16150e62e9ba3f---vowopixumozadezar.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/majojefekuvimaxorumufekop.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/buvajoferimaruzukevegazoj.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/25846029388.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c07e3dbb5---89273406321.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/riratipime.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df918d0a55---lemiwijinoxepoxigelel.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/19326580319.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161304b2ed1ec0---97399212795.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/95189440323.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=getting+up+dizzyPDF 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_off0000af0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF0B 15088 bytes
SHA-256: 6fc8d274651e896e49bdae35bd4eda11998f173106013e6bfe35a90cfa6e4c19
font_01_sfnt_off0000d488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD488 10284 bytes
SHA-256: bcb887390ed5aed06aafabde6e4fc7ec767b1061138dffdec4578988ca9aff4b
font_02_sfnt_off0000eba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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