Malicious PDF — malware analysis report

Static analysis result for SHA-256 c252c649598d6f0f…

MALICIOUS

PDF

81.5 KB Created: 2021-10-08 00:34:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: fea1dcaa0c3c928fa180b3a09ddd453a SHA-1: 4f862f979757b44b082f4b6a5d7b5c2e0a1824df SHA-256: c252c649598d6f0f3ad517312719f21e1ee8560bff92654bb5f6a7030e9a499d
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that likely lead to phishing sites or further malware downloads. The presence of multiple compromised CMS upload links and disposable hosting further supports its role in distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=m+to+ft+conversion PDF link annotation
    • http://digjamaica.com/app/webroot/files/62489861371.pdfIn PDF document text
    • http://aven.su/userfiles/file/40234474780.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/xogegukogiwe.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/93659969841.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/zorakol.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/71199998128.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/20095485490.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/batew.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/vorosetijujobalagefux.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/ce6858c1323c8ee928e968a6dc12461e/3579794646.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4668b550c---fomokaradalagom.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///sazesuwuvowoturiri.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/23636990353.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/junulad.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/97597778688.pdfIn PDF document text
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/78237370215.pdfIn PDF document text
    • http://schturman.ru/files/files/10234381563.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/19662282622.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/pumopovasisinizowuri.pdfIn PDF document text
    • https://eledigitalpr.it/allegati/file/wukuzenep.pdfIn PDF document text
    • http://gibisch.info/files/files/xovov.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/lipazaduvomagid.pdfIn PDF document text
    • http://citra.cl/userfiles/file/badefukenupizudulaxu.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f17caeb13d---susuvixazemotaxag.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_off0000d70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70F 10180 bytes
SHA-256: 3e25f1b9ba8eb90ed43380b26d500c3a6cfde442542d97c03b2971cf452fb264
font_01_sfnt_off0000ee0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0A 19264 bytes
SHA-256: 09c0dcfef56072448addfd0ea39effa90b0a34d3c6cd76e4a41ed92fa167929f
font_02_sfnt_off00012057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12057 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1