Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d6569e3db550e05…

MALICIOUS

PDF

80.6 KB Created: 2021-09-19 09:01:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 60c83767c69e084f5fd93efd794ef054 SHA-1: 49c7d9ee6a951291d5be15dd5c1a5e28fdb691fc SHA-256: 7d6569e3db550e0562e56894986548115c3fa88c811411ede0ec4cd3a3ea79a4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, so the primary attack vector appears to be the exploitation of PDF viewers or user interaction with the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://wastran.ru/uplcv?utm_term=how+to+open+camera+in+android+programmatically PDF link annotation
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/kexewunekagarus.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/37087351943.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134c3c4692c3---kamatitiremopakuxeda.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145e485d2fd4---5438109518.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/33552621781.pdfIn PDF document text
    • https://istanajp2.com/contents/files/25970702665.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/remapev.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/lomerofozofelafiwa.pdfIn PDF document text
    • http://lse.hu/userfiles/file/98893254490.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/a1e86ceadf715cea1ad5ca5165cdeb5b/zunarazevejowig.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/jirasinomawawupize.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/56331611978.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/95096357440.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/memusogusep.pdfIn PDF document text
    • https://tworaise.com/userfiles/file/23761751917.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/6827a391bf52096d10cd63de21402f78/nojolagagigumefopozunizur.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/tifegunux.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/18365330361.pdfIn PDF document text
    • https://viceda.com/userfiles/file/52217970580.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/vekuv.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210916_498A6C28995629BD.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/nowuvimawomizeboriz.pdfIn PDF document text
    • http://sjatupornservices.com/file_media/file_image/file/vasowugukidumugobexewu.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/7e86439827b78d020e866f72a18d16c0/lapowezujupimomu.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/mesabukefadafewi.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_off0000d39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD39A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB1 10880 bytes
SHA-256: 6e0fb25523ce3de059f58d0a53c0e5c6d04d937079f74cabfdd8c97ca431d88e
font_02_sfnt_off00010499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10499 18024 bytes
SHA-256: 0a5a86ff123aa3657f055e19f46268b7647b81e18b126391df5ded373574f55d

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