Malicious PDF — malware analysis report

Static analysis result for SHA-256 663273f779e84eb3…

MALICIOUS

PDF

81.3 KB Created: 2021-09-11 08:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: acd975d99844a08bdd435f377962e294 SHA-1: 9ed6558ec9105df217f502aef666862429364528 SHA-256: 663273f779e84eb305f7e48c08e2d69f0af5e8965cc4bbbacb52143ada4ef72e
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 CMS upload storage 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.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://inwebjor.ru/uplcv?utm_term=ben+10+omnitrix+hero+game+download PDF link annotation
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131babb2e534---6288095979.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210911110622452737immji8.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/60652487770.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b302a2222d---fizazurode.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/vamusagomijodedixaro.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/75866136165.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/13792813203.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/55832450585.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/57012432934.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/94737ceffff15349fb9bcb600d6050b3/nawidasopuperajodel.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b37dbe0661---rogafowasawanubitikukedur.pdfIn PDF document text
    • http://alkanboya.com/files/file///dajexa.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/titoziw.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/24946101529.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/duzizesinidinefitani.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210909080227.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/82345960728.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/81079279489.pdfIn PDF document text
    • https://patriciogaete.com/upload/file/tuwepanenevariluloju.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/6726372143.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/ranab.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/27096010439.pdfIn PDF document text
    • https://viscom.bg/uploads/wysiwyg/files/vimegusofadizipiguge.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_off0000d82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03F 17780 bytes
SHA-256: c3942462fb1aaba251a9bc00415a43ec094e7493c96f6e40d38893da030d82cf
font_02_sfnt_off00011ece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECE 10940 bytes
SHA-256: bd6021086dae5f73bbac1ee2da97282bef234461944b555008cf166d00bd11a3

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