Malicious PDF — malware analysis report

Static analysis result for SHA-256 dccc30cb8746c286…

MALICIOUS

PDF

94.9 KB Created: 2021-09-04 16:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 57a29cc287a341fe65011f0ef289e615 SHA-1: b2725e8acd1a695df20079ac3dbe237818b7f528 SHA-256: dccc30cb8746c286bea5685dfbff24be564a5fe0ecd7d00048640c97fa4cc64b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The presence of external URIs and link farms points to a tactic of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 http://www.parinet.fi/tiedostot/files/jopijupekos.pdf In PDF document text
    • http://limeitec.com/upfiles/editor/files/saluxutadixunef.pdfIn PDF document text
    • https://osakadentalcare.com/contents/files/vegujaxurodudoxetesasim.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/pinikiborifutu.pdfIn PDF document text
    • http://menu2uplus.com/images/file/19158739393.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098f7c1c97b6---kulusedofaloze.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/43681496384.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/34226ebbc3f080366585dc658088e286/58195422036.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/58431770355.pdfIn PDF document text
    • http://whsclass1968.com/clients/f/f8/f849445bb2fb8f42e7c863050dc1ba38/File/58262674719.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/11832290405.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/bd60d94fb78661a1c494825ce2bc0553/58907948041.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/fasedetejerepotu.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077364bd2d4f---60946319586.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/54802131423.pdfIn PDF document text
    • http://yejida.com/userfiles/file/16525304099.pdfIn PDF document text
    • https://lasanisports.com/files/buvajozoziv.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/vubokikemusageluz.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/71440374900.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab700a3511e---pudofajetasamabedibew.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/41747698702.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/1d7a4c1ef9cb467c6f6a36f1f7bb7e88/960073500.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/38d7ae3dc8215da30348cabb03c39d46/12341863391.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=carestation+620+service+manual+pdfPDF link annotation
    • 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_off00010315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10315 21268 bytes
SHA-256: 1063e8c6cf73e8705423de2ab6fac65a4dd41648af2e6b60664c984dee5b6fed
font_01_sfnt_off00013a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A96 11388 bytes
SHA-256: 41e516151426bcbcaab6352ceb9d47c6b7974d4f338d5d363f62993ca29cfc41
font_02_sfnt_off0001557b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1557B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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