Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae17a9a24d441b19…

MALICIOUS

PDF

79.0 KB Created: 2021-09-07 12:38:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b22b00d0916288518e6ee72c9bac7885 SHA-1: 889349960fb30d1e354931af71815ca61825c54f SHA-256: ae17a9a24d441b19fd93139a2ae4c5053125705670767bb54f02043001b1398e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream 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 by leveraging these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://cructi.ru/uplcv?utm_term=ricoh+mpc+2500+user+manual PDF link annotation
    • http://luxmeterthai.com/ckfinder/userfiles/files/mulikofamozexixojezox.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/3702270964.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160afe34a1c6ba---bisanogamuwu.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815a7eca00f---13944440902.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f76c32bbd---46620261842.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/suzubo.pdfIn PDF document text
    • http://ipoz.pl/userfiles/file/sudofobizovadu.pdfIn PDF document text
    • http://kalikraft.com/images/file/88236370760.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102d18c44e40---45640492720.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb86be7051---golesezudetuwemo.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/83088579815.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/buliwop.pdfIn PDF document text
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/157cebc51f68efde13b259766fc264f7/fejanawowamelazifisesanig.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd306da730---nafiginudemofeniwakevido.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/5fji651099ef7upv6sjhmcoqb7/mikogare.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d836e42a0f---puzidew.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/17184445850.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/wifiwojat.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/28b1s8lqaca3opcirdstvsa5u2/ribunibuvunirakuxusofedub.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7c5383278---97080661700.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/vifomimudomal.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/jivetekome.pdfIn PDF document text
    • http://pestcontroluttara.com/ck/upload/files/76753101543.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/gugujusevow.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1610a853786c3b---20119288085.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/b35750a68ab012a2c1fe472925fd768e/mikazed.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_off0000cf54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76B 11060 bytes
SHA-256: 40538c39c85fc4cf28481e2d287292368acf5bcc92122f69101ad2b8d6cefbb3
font_02_sfnt_off00010100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10100 17540 bytes
SHA-256: fa917101a555115d33fa5a9bab3b28df5c43bf22f4b1e29833c1a34595faa2df

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