Malicious PDF — malware analysis report

Static analysis result for SHA-256 959148a4d62a7f08…

MALICIOUS

PDF

71.2 KB Created: 2021-10-01 13:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4e8a44c7200fd533486376ea724f1ab4 SHA-1: dc1f05828d86acbfa4d2db3b51d9f49d32c534a3 SHA-256: 959148a4d62a7f087808d9ce0b7df3cc6a57e6f7ee57f60ec2b42ef35717a52d
164 Risk Score

Malware Insights

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

The PDF contains an embedded JavaScript stream and multiple external URIs, indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggest the document is designed to host a collection of links, likely leading to phishing sites or further malware downloads. The ClamAV detection and ML classifier further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://medvor.ru/uplcv?utm_term=the+walking+dead+1+season+1+episode+watch PDF link annotation
    • http://cartopack.com/Images/file/vokozuwavonapufilugi.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/57870824146.pdfIn PDF document text
    • http://pyroglobal.sk/app/webroot/files/userfiles/files/dejasufa.pdfIn PDF document text
    • https://hotlinepro.in/admin/userfiles/file/733475832.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/raamgptporc5019nhoqf3so8p3/56169938715.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/dobigimufi.pdfIn PDF document text
    • http://vinmexindia.com/uploads/52504804743.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/jenazofofabupudogetufa.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/fejagudadabemelobatiwi.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/12883530196.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/pijufetina.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/8290554302.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/vubukobazavol.pdfIn PDF document text
    • https://visualarchive.bg/files/kinonotiledaliw.pdfIn PDF document text
    • http://wuchem.com/upload/files/93447906167.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161334412b5c12---mogefelidiwiximusozeselug.pdfIn PDF document text
    • https://robertbah.si/files/file/69106239857.pdfIn PDF document text
    • http://chicopharm.com/upload/files/dilelavazilitivejonomof.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/8936401482.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/61610032515.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/geragosesufobezobo.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161432a6d2358b---dutapataretuzufejiv.pdfIn PDF document text
    • http://jutaek.humenia.com/upload/userfiles/2021/09/files/210905040045.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/zawuremujo.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/62574371319.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615194b4de5b5---nukaguxupurobagarilisoluv.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_off0000b3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD3 10884 bytes
SHA-256: 3586b4802e8d3c0cc467500d26e191a25047552101f2177765b2e353d9ad86f2
font_02_sfnt_off0000e4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D9 16580 bytes
SHA-256: 5ee8a1e774b1ff040155edca5a3b9db7e4ebbf17254071bf95529e8e62a88859

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