Malicious PDF — malware analysis report

Static analysis result for SHA-256 53d6aaea3906d7d4…

MALICIOUS

PDF

77.2 KB Created: 2021-09-02 17:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5c2ec3ebac30720122c136d1b7351576 SHA-1: 1e01eac2ebfdafbe54590ed40397d8b48c3fd5fe SHA-256: 53d6aaea3906d7d45280cba40d93add04a0def1953e43c5bec02882550b6d59b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to distribute phishing or malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crysiq.ru/uplcv?utm_term=junior+high+school+mathematics+textbook+pdf PDF link annotation
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/majenef.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/wadowovamoforuxegogeriba.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/vch6q4hr9sq9u4qv98uv7jnkff/1852419823.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/37bisql5jtd0kibf556tuv1e0p/56206436464.pdfIn PDF document text
    • https://tarzminder.com/resimler/files/powizuwekuwe.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f50715ef50---seloxos.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa60fc6322---mamowomi.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/akm9i92tdpmc5dg144lsqrl5bk/79009506000.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b954cd9ae---vamus.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160727568d601f---darajomotabawal.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202108231505362176.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129cfe18474d---biwokopenosenejegiju.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160879d5186eaf---11553354353.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba260564724---5839935869.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/36621749770.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160edc91bddcae---rozolinemegeruz.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/rezezefiwe.pdfIn PDF document text
    • https://jaiminsales.com/ckfinder/userfiles/files/67333794196.pdfIn PDF document text
    • http://coumert.com/images/file/21088582363.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/wukusixipopodanudowivob.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/sinexokokimomup.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/c0a2b761d12601daf12c6f4841360385/96304297377.pdfIn PDF document text
    • https://aduanaldelvalle.mx/userfiles/file/41329183190.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///vajamamugutes.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_off0000c937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC937 16584 bytes
SHA-256: b9381b87613026d43350749262475d3d12ebe4253a59e43463e14891ea367e0b
font_01_sfnt_off0000f3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B7 11492 bytes
SHA-256: d6147d1dea0617f48fae1b9c60bb6a19361df27cb9a600922edb2d32021c3d2a
font_02_sfnt_off00010e5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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