Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e8451e764dd0131…

MALICIOUS

PDF

77.9 KB Created: 2021-09-18 20:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f699f73e8f8a6dfb3bded4f526e9579a SHA-1: 63b392e059d632e9f507e03eb3804dbb2bddc979 SHA-256: 7e8451e764dd0131702522769038f801a3b55e5e67f0ad19e597c6efb24f517c
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://medvor.ru/uplcv?utm_term=madden+21+hacks PDF link annotation
    • http://bosch-elektronarzedzia.pl/catalog/file/jotexalujif.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/kulesa.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210914150234.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/vibapuzekerolil.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/bodulajutupe.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/79557148310.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/91732584481.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/3492078952.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/kosaru.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/wadigofabipadetevodis.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/58134171781.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/janaxi.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143eaa4b28d2---wozoliduvelikavawig.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/27777073921.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/pikimedabajuwew.pdfIn PDF document text
    • https://marugame.hk/editor_upload/file/40444909776.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/mobimokixavefale.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/cptiil0kj8ptehjlal6rm9mi1s/54915419158.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/pokiwawa.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/fudopujigetusinafado.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/26044817707.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16141f06443ad6---dovemivedada.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161371e1d11005---resanofipaxakodijom.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/ronagaruwuxobagasakujuvez.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/bogodomujizibenaf.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/zokonokika.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109031411551444.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_off0000d033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD033 16792 bytes
SHA-256: 38131347488fec16d9c1e49305fa3e186afff9784702117a11ef8b3a0beb2e5e
font_01_sfnt_off0000fb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB62 10268 bytes
SHA-256: 30b6dd101d5573c68cac3be991bf045f9f52a00eac61cf2eb824aa5be7dc1a16
font_02_sfnt_off0001127a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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