Malicious PDF — malware analysis report

Static analysis result for SHA-256 96abc1944193af41…

MALICIOUS

PDF

73.6 KB Created: 2021-10-02 11:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f2531e4fa9985eabae09509ec78ffd31 SHA-1: cf84d5cc3585b9499c1851b776abf3c7afccab1a SHA-256: 96abc1944193af410d25d935818f3606bfbbc8148b91c413936d814173f9928f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crewmak.ru/uplcv?utm_term=dark+souls+all+rare+weapons+trophy PDF link annotation
    • https://greenboo.vn/uploads/files/97286274703.pdfIn PDF document text
    • http://www.pratikchoudhury.com/fckimages/file/detasufabobibumuxujewoj.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/75097935351.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/tilupu.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c88390de0---88971242461.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/jesenusuwavefabal.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/tpgumbtt0qvr7c16i83ij9iskv/libegitawetu.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/doselekus.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/33067681602.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/31218807453.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/zovosoveriv.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/89087936958.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/laroduvimurugevafanawel.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/fusuzevofaxelami.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/miwizalenomo.pdfIn PDF document text
    • http://maytinhnangdong.com/files/uploads/editor/files/22203360916.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/18727777078.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/83078775223.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/xiroju.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/raxemaxifer.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/02937c2dee7f3c36473893ea122bc607/23700379439.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/fovage.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/28866022695.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_off0000b6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D6 10648 bytes
SHA-256: 3d73789a6d511387e773032ae82954d53852030c91d4d2effedd761b701a93ca
font_01_sfnt_off0000cf4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4E 18416 bytes
SHA-256: 4e440492220f005082cc0c5180249ccc3848e29a8a2f1171260beab410724528
font_02_sfnt_off0000fef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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