Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cadd29753b4b1ff…

MALICIOUS

PDF

82.9 KB Created: 2021-09-03 18:12:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 908b000069af0a6b28ae2b6798d8e15f SHA-1: 3356ccae726a2b6d19a80db98b75e0e097afef9d SHA-256: 8cadd29753b4b1ff431f7a9c26301503b486c2a1b7bde96e912a89ebfffbbf2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://nomylo.ru/uplcv?utm_term=cours+de+physique+chimie+classe+de+seconde+pdf PDF link annotation
    • https://olivierdaulte.com/ckfinder/userfiles/files/kodomenemizo.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/a0a9ce69e33fa7393492136dc401e378/34858537912.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/70436838251.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16071454dd10e8---57437533324.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/besikonamanibegok.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/9cbbknbm168vkiiibcqii1r1bg/gakemukel.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/2663870140.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210613192236.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/wajipasoxarakipu.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7101aa98f1---simovil.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d914c52b08f---rijuxigumezasufobonilir.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/kamoragudelipunulu.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/5s535iheo3br9mr5rokoacqeee/61181419355.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/49396193568.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/28282670210.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/jelogulimej.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/korivurelisox.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/63bfe3520752e927a5fd2cadf4badc46/94686591000.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca62791812---luzule.pdfIn PDF document text
    • https://pendekaremas.com/contents//files/dulipozuxolipo.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image//files/61887507077.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a15523bea9---godur.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/5492569682.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_off0000d94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94C 20304 bytes
SHA-256: 7796fb43aad2390d933c07bc0f0614e52c260b0894f9d3007b5b065828b938ed
font_01_sfnt_off00010bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12410 11180 bytes
SHA-256: 0f6acd130b13d6328dc09ea278fd6da42f6c849a2befd14923d5b00b09d39dd9

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