Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5cfa3611aeb3de3…

MALICIOUS

PDF

84.5 KB Created: 2021-09-05 06:14:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2bd625dc6d9af19b7c873a2b2bbcb3e1 SHA-1: 2bf85756552860f83cd78b195ae390d99558f71f SHA-256: d5cfa3611aeb3de38f90a1c95b8259d7692187fa6dbb9645f248950349c9f138
184 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. Numerous heuristics point to the PDF acting as a link farm, directing users to compromised WordPress upload directories and disposable hosting sites, likely to facilitate the download of further malicious content. The presence of embedded URIs and the 'ML_NYX_PDF_MALICIOUS' firing suggest the PDF is designed to exploit vulnerabilities or trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=intermediate+accounting+15th+edition+pdf+free+download PDF link annotation
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/eo753bhprga2g6dmh2uhflca12/jojunibul.pdfIn PDF document text
    • https://bselink.com/userfiles/file/67359998578.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/sivatodazisolofag.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//2354374832.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/786ece42499cec8e4ee343c3efa3ebd4/timiluw.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/wonaruxefopipufade.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be12d400e9f---vowowalivamanosozapewir.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/nilaze.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/8f04cd2fd549a01ea720c2353531c54c/wamigirewunolatim.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/jgdun2ksmkr45punj0hs7cs271/pidarinogolamuta.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/mirodavexotukawo.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/c431d501b1dd5ba5ea251957c77e30b6/99884778818.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/dopoboxizavedufen.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/texevifom.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfc7c62811---nomalagixovawapu.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948a892d600---24756845653.pdfIn PDF document text
    • https://termoformat.md/img/files/zifekunib.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/54903826584.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/65189982325.pdfIn PDF document text
    • https://electroagro.es/pub/files/39881486740.pdfIn PDF document text
    • https://renetravel.ro/images/files/gobexesafitudesomi.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609448fc32019---mutifawugus.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160891673cf49a---15543040044.pdfPDF link annotation
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4bdd4cc78---zozozizipuroxewegebepenif.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_off0000e2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A3 18132 bytes
SHA-256: 53a15e8068e6f16af97f0ed7dc26069308e0bc9ac04d55a005af73a7919f88da
font_01_sfnt_off000111cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E6 11224 bytes
SHA-256: 7573701330158bfa7c7f86886d45f196b928255679ecd7e09f5ea890ba907139

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