Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf16c542e4f51a9…

MALICIOUS

PDF

70.1 KB Created: 2021-10-04 09:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9fce95ed8f42088fb83683059162b8e2 SHA-1: 25b95ed0570a85e8553c195a8909f5d9222b895e SHA-256: dcf16c542e4f51a9f5fe4ed3e724e40572782243d4b3aad5c1c18bfa6d37a9a2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via these links. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

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 https://medvor.ru/uplcv?utm_term=best+movie+apps+for+android+phone PDF link annotation
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/13167085644.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/talovuvifesofatijivi.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/92b311a43ede4c22b211ec88de726a2e/sivuwusasumovopuxi.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/52994616261.pdfIn PDF document text
    • https://matratva.in/userfiles/file/mafusudawixan.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/xozavolud.pdfIn PDF document text
    • http://makaroma.fr/upload/file/81184374838.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/82827095113.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/reraxapudixuzalufedepaga.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/67632275932.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/28981021606.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/9aab2d60f853a727996b8184c1234e51/52857696111.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/sivegefofoselagagebux.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614599af63e21---85955695480.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/faxefoxodixiv.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202110040109213001.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/62405560165.pdfIn PDF document text
    • http://allineers.netlovestories.com/upload/files/torovo.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/85943319688.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5ba33ea93---disuvidupinuponesozorop.pdfIn PDF document text
    • http://roletyhanarol.pl/files/file/gowubes.pdfIn PDF document text
    • http://www.puhito.hu/uploads/dolikosot.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145049b27970---43238097992.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_off0000b290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB290 15540 bytes
SHA-256: 65895169bc7e0c4c6e97893a37b6d2af0e0d1ad359362e009ccc4ba2a0a227ba
font_01_sfnt_off0000d9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B3 10836 bytes
SHA-256: 07f37daf7c6cd65d128bc85d074e9cddf85f91b603b5ac0b2edd4cad4528bf1b
font_02_sfnt_off0000f298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF298 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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