Malicious PDF — malware analysis report

Static analysis result for SHA-256 17be327d3ee96d2a…

MALICIOUS

PDF

82.3 KB Created: 2021-08-18 16:42:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c20fd64479fefa263b26e3d0a3d7a000 SHA-1: e6448e48966b62bdb5a1d879f030b732a0510be7 SHA-256: 17be327d3ee96d2a45bf1242f4b8a52fd766144521df81c834638028409c2247
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV/ML detections.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098abc1ca188---ludetavilif.pdf In PDF document text
    • http://kruengrangthai.com/files/files/berezajijixupirunezaw.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/64793010076.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/57229993605.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/vesudu.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/furuvumodusixibukuxa.pdfIn PDF document text
    • http://ms-domino.eu/images/file/files/22645538491.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46c5425025---rodogukudowifobina.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/48519476815.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6c1787c8e---27680761785.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608eec3d63493---sakawotijusupuv.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160811792d0186---kedigano.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160728545014a1---74436075708.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/43962334432.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/silegolilitawofa.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/114664efec36d45acea97cdeb882a3dd/wopitumagepexofefalufuli.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/ff22928856626767a6772ac4b6925b11/9996304846.pdfIn PDF document text
    • http://edgewood1962.com/clients/2/2b/2b25cacec04995aba37d275b9c35b4d1/File/rulamovi.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/8148236163.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e81c65dcd8---lewunerowasijabavojojuluv.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/zuvoxamanufujikazubetig.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/9e29c99af3c1557bed9702ebd0439819/28512561079.pdfIn PDF document text
    • https://webmenuplus.com/images/file/nomirizemiwowipelufat.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/kc2onbfic0fcogpbiv1sjutg92/68607445525.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89e2a64526---feravobomanogofakorozalad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=jasperactive+lesson+7+quiz+answersPDF 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_off0000dc56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC56 17080 bytes
SHA-256: be26cbaac3a471499371cedf93bcbd70b4d22dee729d1a9799c9fdd7cb8cc919
font_01_sfnt_off0001091d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091D 10868 bytes
SHA-256: ed037b913ae43b4f88fcf49b68549282044f0fb58552190b4d33c7a713ae2bca
font_02_sfnt_off00012281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12281 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1