Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3d3c31fbb1beb29…

MALICIOUS

PDF

90.8 KB Created: 2021-08-03 02:04:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f270cfe98a5cdbbafb6a92708ab80a64 SHA-1: 8b6f0c80d29509b22249be9aa5fac54769541af8 SHA-256: f3d3c31fbb1beb294452ec9f7a45919516ebf10b8b1ecb62d566c2afcd1a46b7
156 Risk Score

Malware Insights

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

The 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 potentially compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the PDF's primary function is to serve as a lure or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ingfrimale.com/userfiles/files/mudeleraxatijamovofom.pdf In PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/03or0i2bn0itspt7t25pi4vf73/bakorobi.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/0a5opkf3aj2oqhso0utn4tjor0/88934280384.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/707c40e101996d3953a89cda5723e4eb/lalenavezomud.pdfIn PDF document text
    • https://juraganmonyet.com/contents//files/18720970222.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf84e1d25b---rimajuweruxoxinopo.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/liridalunomu.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa5dacf7a8---88680898018.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/pogozanotekonozawe.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160763b15ce694---gimupapusomedevifetorituf.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/69159190489.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae47384f0c---58207643541.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/nisuderima.pdfIn PDF document text
    • http://theettiares.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/37969926629.pdfIn PDF document text
    • http://azizolace.cz/images/file/61154433977.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/ec69f95e608509a0686428c11cf74b6c/vomerisigujexitaf.pdfIn PDF document text
    • https://seerupit.dk/assens/file/jijamowuvepejag.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce68d72dab---67360683565.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/80358395629.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2602768c8---19087021120.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/57757401191.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/dimuramuxosero.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/f0f1f1fead82806ead7d2797a8d60ff4/43914165202.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/metexuxi.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/13070459431.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=baixar+b%C3%ADblia+do+pregador+pentecostal+almeida+revista+e+corrigida+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_off0000f8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C9 11388 bytes
SHA-256: d348105f0b149466c82c3c40ba18e11e9fa72d103da24fec908a7176400018cf
font_01_sfnt_off0001132e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B40 18772 bytes
SHA-256: 14003a53a4d9e4c84b1876be1977135b3543d91e2ca9764d0c033d5cad313e50