Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2cccac946b59dc0…

MALICIOUS

PDF

83.9 KB Created: 2021-09-21 16:22:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 588f04c1633d6f4f7014e3bda4f6d04a SHA-1: 37dc5a4b97e941cfac2940eb8495f9fb062da1ee SHA-256: c2cccac946b59dc0aed0c8c93fbe4e9b9ca4587749450a08eee0e7c74f31d80b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many pointing to compromised CMS upload directories or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further suggests malicious intent. The ML classifier and ClamAV detection strongly indicate maliciousness, likely for phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nomylo.ru/uplcv?utm_term=football+manager+2020+ios+free PDF link annotation
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b865b32293---wapetulekezet.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/78542691699.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/xofamim.pdfIn PDF document text
    • http://davobio.com/upload/files/rixifosemivigadaju.pdfIn PDF document text
    • https://istanajp.com/contents/files/wajonezex.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141657886475---melitasiti.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/19409012555.pdfIn PDF document text
    • http://sial.pl/galeria/file/16272761996.pdfIn PDF document text
    • https://peterdegendt.be/file/wemipiwev.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/jipulikuloxupijusujen.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/33127923144.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/pikurewiwafelor.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/63908502314.pdfIn PDF document text
    • https://mcsfood.com/images/file/98622267904.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/zedovorob.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/65887000588.pdfIn PDF document text
    • http://haokunchem.cn/upload/files/dipokagalepi.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c63ba2315d---28011341232.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/11958694339.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/vepome.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/99145149642.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614330ee02128---pinaluxuwirumuzalijid.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/76559043918.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_off0000e199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE199 17864 bytes
SHA-256: 24468acbd978f17ea1f4a38533ffeb222574242431c1f2ea9d76e6710025e4d5
font_01_sfnt_off00011086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11086 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001289d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289D 10916 bytes
SHA-256: 2eb98358f4cb7d3675abfdf07b4e6a7b5cca1959ad42a3ed77f4b388ace64fe6

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