Malicious PDF — malware analysis report

Static analysis result for SHA-256 6319eaf16fc5ac08…

MALICIOUS

PDF

82.4 KB Created: 2021-09-19 09:13:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e5b389869966020ad733efd9d15202e5 SHA-1: 258d5328724fd74e6d8515f9c8bf63750977378b SHA-256: 6319eaf16fc5ac08b032f5040e8ffda9185bf216a5a68adde2e8142622a6af6a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or delivering a secondary payload. The presence of a link farm and a URL with a 'utm_term' parameter for 'angry birds hd free download android' suggests a lure to trick users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ketchas.ru/uplcv?utm_term=angry+birds+hd+free+download+android PDF link annotation
    • https://rotterdampools.com/contents/files/tabowiboxefufamuwezu.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/31234640431.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/ledomo.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/24380784044.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/13308127206.pdfIn PDF document text
    • https://bloc-immo.com/images/juzupivudujolapale.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/medekusetapatekipekokobi.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/24947863772.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/161532223654.pdfIn PDF document text
    • http://congtyvima.com/images/Download/50928386852.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/3544944406.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8a5e3b076---buzukagaxoroma.pdfIn PDF document text
    • http://sibstroiexp.ru/userfiles/file/nezadilololo.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/gejirolekinomawamive.pdfIn PDF document text
    • http://partnercable.com/files/gamuje.pdfIn PDF document text
    • http://silver1979.com/upload/file/likuvidizujalabolavo.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16134be06076de---4320268778.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/xuxuwovuzuj.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/83210881251.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/82510439564.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ed7ccfce3---80580606598.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///70177917682.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/36129659556.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/096c4291dc45db535214e4b09e243031/80484426553.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_off0000dd25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD25 10856 bytes
SHA-256: 96467049c61720be0c3fb342bd538b51fba48993d90144ed4cd1f6176a1e3fe4
font_01_sfnt_off0000f5ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E11 17576 bytes
SHA-256: 9d70f7960f4214ef5f0fc3c5611f8cf523c2b92d07518f1ee189ab31f597c52e

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