Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd0dd0f22df356aa…

MALICIOUS

PDF

71.7 KB Created: 2021-09-04 20:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0d7fce2da9158fd077c81f803562ccda SHA-1: e2983324df0d705bbc7da5795b71852b7f2b42d4 SHA-256: dd0dd0f22df356aa0791e8e0a78e02a808073f07a8e979d11ad6202fcd756b21
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://terralis.eu/catalogue_dynamique/file/13238385071.pdf In PDF document text
    • http://suachuaspa.com/upload/images-content/files/banizezijinixofesubos.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161234fead6c93---9127682156.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/lakekamaz.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/bofonorofoni.pdfIn PDF document text
    • https://agatanorek.com/files/file/13885779908.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/mivesesivofaw.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/61657972104.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/tagomevafivejo.pdfIn PDF document text
    • http://masonhn.com/d/files/53986158249.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/47390716690.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b6dead95cd7---xexizakizonadi.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/vukurovubakowozexovirota.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/wevamatodijajigijukufimin.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607c076060449---47552035026.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f49c7cdd551---83806204583.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/gopadutewamifedameloxi.pdfIn PDF document text
    • http://nabisori.com/userfiles/file/58808672879.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/gefixobidogomijeti.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/84ac2239443393c63af0259526eacb44/zuxuribebuv.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160784e6f89a62---9886445250.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d01f7fdaf1f---90438588570.pdfIn PDF document text
    • http://7linc.com/uploadfiles/fckeditor/20210823/file/16297113247281.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=node+red+raspberry+pi+tutorial+pdfPDF 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_off0000b946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB946 15364 bytes
SHA-256: 295b5ef4d7e0a3659fc832d8c015cba8ec3c4aada48b130822d814b7ce9f98bf
font_01_sfnt_off0000e088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE088 10716 bytes
SHA-256: d07133121dd2b87879e839319fb89eb7099272624a16f13cd74eed43a01a5783
font_02_sfnt_off0000f90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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