Malicious PDF — malware analysis report

Static analysis result for SHA-256 55218722dc450374…

MALICIOUS

PDF

72.9 KB Created: 2021-09-17 20:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: afd488ea1fbe5f902a2d7715e2c2b6c4 SHA-1: 52f4a1821bacec07ef9afa3dd239197faf5266fd SHA-256: 55218722dc450374910080b4041d29a7902c71d93cdd534be682ebe59a517a4d
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 CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The file's structure suggests it's designed to lure users into clicking links that lead to malicious content.

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://ketchas.ru/uplcv?utm_term=the+forever+purge+showing PDF link annotation
    • http://sloplast.com/userfiles/files/xazeviwenutudinazoru.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/laxutipafiko.pdfIn PDF document text
    • https://svltv.in/userfiles/files/27171019043.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/92537615726.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/32873995546.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/c3fcdad5585f47abd6c7ea68a9af8f17/90443499094.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/94092d8e892bec1e039dc0639566a730/26408042664.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/41414308929.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a1353b04c---59966634913.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613e56448980f---154871232.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdfb8acb84---gomeg.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/94719250181.pdfIn PDF document text
    • https://webmenuplus.com/images/file/zatosizugikugubividunifoj.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/zulalip.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/nelijax.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/43999433737.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/vutejezipibafarobetad.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/damopixesezewunezalajasef.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210911153516.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/2217816953.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/73534707254.pdfIn PDF document text
    • http://asja.ua/userfiles/file/nigikeguwo.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c65bd58043---saduzu.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/nedazo.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e7a888b97---sawugetotaverarozuvup.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/mosivatapozebenaroduvo.pdfIn PDF document text
    • https://beaszemin.com/files/85782244524.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_off0000bc19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC19 16244 bytes
SHA-256: 4338b87427687ff6703d77c74bc5df419ace6a1e302b94696ca2a12ed7ece9ed
font_01_sfnt_off0000e5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E9 10548 bytes
SHA-256: 26164d9a3260f8f74dabd5a330d8b353b69fb562607abb87018e2457d74439fb
font_02_sfnt_off0000fdf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1