Malicious PDF — malware analysis report

Static analysis result for SHA-256 78f99a88e729eaea…

MALICIOUS

PDF

90.6 KB Created: 2021-09-08 04:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 380bba1ec67575b14c07ccb2344fa854 SHA-1: c8a8343606b598eb35346ade8424ac866603ae85 SHA-256: 78f99a88e729eaea90f5ddafc54e769ff0041aa3689564d18635dd219e863469
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://ketchas.ru/uplcv?utm_term=quiz+anatomia+patologica+pdf PDF link annotation
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a24c3e7610---nitopu.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c15a6e0bcb8---13320272033.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/nomatososejukogejufajur.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/ee86275871f8ec7df96acf3f7a48458b/rofinexokotenefepum.pdfIn PDF document text
    • https://coevent.ru/upload/files/59779211032.pdfIn PDF document text
    • https://kund-in.com/userfiles/file/56929116539.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/feseporafenarabusavego.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab700ed06a0---19694787177.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/ligafe.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/gobizeril.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1aa844c25---mojotanoromat.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/49724459259.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/jubiwezufor.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd641d91429---39329563700.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cce403d0f3---87331831917.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/m6njiigvlk7aojikbi2rsi1coe/milumaxojoda.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/toxibalexuvola.pdfIn PDF document text
    • http://agrion.org/upload/fichier/wuxoxusiwojo.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/68479188e256922037e52bf1ed9df8ab/42079191850.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c83d9e9738---setesuzujusugunimolukiv.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/49721039783.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/64375644590.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/161191a5e6480d---vogujupatutikaxofu.pdfPDF link annotation
    • http://oreade-breche.fr/userfiles/file/lilapapabavazovuta.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/40306842094.pdfIn PDF document text
    • http://portalkucharski.pl/app/webroot/media/files/dilatopebefimozamuliwabi.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/e1baec9ad9c0259786168fc3eed4b05c/57627558667.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_off0000f91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11132 10780 bytes
SHA-256: ecb3fcfb85cb8ce0e072f6726cf0de9f72a8ea449a31efc3984856afd2a673f9
font_02_sfnt_off000129e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E0 19652 bytes
SHA-256: 5075bda094a86821671b67dd7b01377ff67d1ec531a5a561fc6d17216d051538

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