Malicious PDF — malware analysis report

Static analysis result for SHA-256 f596b6f1eb91ce77…

MALICIOUS

PDF

117.7 KB Created: 2021-07-07 20:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 740860d32c5e680953e44ebdde978a7f SHA-1: eac1d647962b226f5517fa0e764ccbfac434f10c SHA-256: f596b6f1eb91ce774b2ecf6e5ee3bddfdaadacddc3d8ea8d248c5b4ade25d75f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to phishing or malware hosting sites. The presence of multiple external URIs and link farm heuristics strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9851

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://archism.ru/uplcv?utm_term=objective+anaesthesia+review+5th+edition+pdf PDF link annotation
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/c936f2ec9078cecf1b15611b6bd75c3c/32740827352.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/begosozoxotisepebulorumi.pdfIn PDF document text
    • https://medtek.vn/storage/file/waziwimalow.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c443552726---rabuluge.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/tinegevafedoxaradu.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608523e7347cf---27689126016.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/sqlcgrahm81ocbtfthvaafuu75/fumezesato.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/35b8390998cf1f5e07af5269d663dbe3/lidasepusotiturorek.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160df75fcd413a---belozaxibedamobuju.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/47a3a4954c0602bfb3227bf44130968a/zobodowuvigepalidaforuzit.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/zitiziduf.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885d9529016---ropuxozajamurulesukixuli.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/3fbb4c9cfe4068377b4ddf4f59ba9ab1/63079547906.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/e3dadf8fc5c9b15115c8856981622ff4/kofokapixuso.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/kefisiwajo.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file///2021052914251751.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160899d61a47ec---79236387492.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/45353648554.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/supidebifup.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/7dacb0b2475d13f1430bedc28bf58e30.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/tigukirokawigu.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/zidovapapokunijo.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a49e1108f9---nabisedeti.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/4jcpevl6re6el8uqe47mg7q45u/gesenisupapabijewumis.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609832667f3d2---13499466257.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/bufojojibaralatuni.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_off00016643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16643 11252 bytes
SHA-256: ef6021806d60469586e0e5a9bc45b61b2f1fee84360062e673e801ff1ba48f48
font_01_sfnt_off00018089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18089 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001989b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1989B 18588 bytes
SHA-256: c98d0e4f61e5b72dbc8a8da7124255fcffd8185ddd6b0d6249a4e4d65461994c

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