Malicious PDF — malware analysis report

Static analysis result for SHA-256 97e5298feb9f9724…

MALICIOUS

PDF

100.6 KB Created: 2021-09-07 14:20:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1cc503d3ca2042d77f15a378e9685a26 SHA-1: 358bb5c2652801ae5cfc75c95c87cc6729378424 SHA-256: 97e5298feb9f97248484bb2d63e82b8455ccab4b83c5c5b53b4c2e57f7b8e510
164 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload storage, indicating a link farm designed to host malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading malware via the presented download buttons. The presence of external URIs and a link farm structure points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070daa428edb---89317878235.pdf In PDF document text
    • http://vipforiraq.com/userfiles/files/giditaf.pdfIn PDF document text
    • http://belgium-ex.com/xafewuzo.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/duxefivejotexunoxonivinel.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cc94eb547ad---zozanixuvagadoj.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a18848f0b3c---51747952202.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/lufodawafifufilivor.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/gamoxifuwivikasom.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/afef0accd35ba07bee89eea028d3d823/wezixuxukiv.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/c46c3c54fcc3e2657ecf108aa4e8f23c/siduno.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160ca1a4c23b2d---93842688592.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/47421957655.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/46356892251.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160817ac55ecb3---kizozozagopi.pdfIn PDF document text
    • http://fpole.ru/sadm_files/vikitekanojoman.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/bd88s3fo6r65e2sr4r3s3dm9d5/24727499444.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/mosipigatigomavoketeziget.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161335e75c6d55---26410527473.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/fipejojadoduzatelijugul.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8bc62dcd7---24511172638.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/9eqg8oasdutoh2dihg6hdd27nv/42109950168.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/98034845425.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6d1927e43---99028855252.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/lokajuled.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/zixilomaloj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=10th+new+syllabus+maths+guide+pdf+download+in+tamil+mediumPDF 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_off000118fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FC 21780 bytes
SHA-256: 7f7dec1d8b1c242e8c05ad1a1d87171a75368aee9147982339e26f79139517d9
font_01_sfnt_off00015191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15191 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000169a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169A8 11364 bytes
SHA-256: 05d53e78c8ebd01c87d30a2d59cfa1b7f44a8a6bdebaebe6cb74994054aa2a14