Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8d529f5cb341a03…

MALICIOUS

PDF

82.8 KB Created: 2021-09-08 02:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b511c0ecbe8a2ad4dfb4b54cafd08156 SHA-1: eed3af418d78c7805e3704eb01f289ea6977310c SHA-256: b8d529f5cb341a03f41dc3e9bdb4350a8e4fc4f10df8441037f7ddece3eb813d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics point towards an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=nuance+power+pdf+3+standard+vs+advanced PDF link annotation
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/nn4b6icu096jn4bqu9qcaomtek/nugokinilefajuzose.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/75qf4v9f81n1lp493u3tg8tm4h/tinafumalejin.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/c7be57a9011dbe009b59776066e47c78/62458131843.pdfIn PDF document text
    • http://wearefamilypalestine.com/clients/3/3b/3bc38fc23f9ffb54b20226cbd6ad6ce3/File/50923745854.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/80938942388.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a568a442626---88680960129.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/63428281120.pdfIn PDF document text
    • http://hms31.ru/img/file/59555648618.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160af5e4dd1160---66642073842.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/vemunesepajelotok.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b44c10f42---9965203140.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/24255097599.pdfIn PDF document text
    • http://endemic-capital.ru/uploads/files/48526029935.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991f6d57d64---fuzopubevorewixuweji.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d59ca6fb3---zowat.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610405e265c88---49788790732.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/kikadulor.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/gm4ol9tf80ug2675pmm7slgugp/mobezufadedifarosewujame.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/45807401438.pdfIn PDF document text
    • http://bienbao.net/uploads/files/madug.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/30259913023.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/vqcle1f15vjno0rld1mvm0lfc1/29460633934.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b92f1542258---90714030232.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_off0000dbf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF0 18364 bytes
SHA-256: eeff8ef1f9e79417f2ec5f8531dd5981844e21be3287f2fcfb04758ef447aaf8
font_01_sfnt_off00010be8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE8 10876 bytes
SHA-256: 0ce946c7859348e5aab214d3032c7e9095255beee15a54457f2a0dc3c9922eb2
font_02_sfnt_off00012552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12552 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.