Malicious PDF — malware analysis report

Static analysis result for SHA-256 4264302e0ab20418…

MALICIOUS

PDF

77.9 KB Created: 2021-09-13 20:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ac873ac29db4abaf28f4bf0360e8291c SHA-1: b50f4790c8488385dbd17ecd9b9f1fdea1a22d60 SHA-256: 4264302e0ab2041858ffeb592bccba65d95c7aa9e7e5cdc0b9477940e754d66a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate the document functions as a link farm, pointing to multiple compromised WordPress upload storage locations and other disposable hosting sites. These links likely serve as lures for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/81aa1ed9179a85a65853153eac103df7/dudiw.pdf In PDF document text
    • http://gazomotor.com/allinone/file/gexodowodikefibiwiva.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/beduredivojavoduzixunet.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/35929780383.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/pixuwupomameb.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f01d97b012---xixulimabivixujinunewe.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52815402442.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/37718427083.pdfIn PDF document text
    • http://xprchemical.com/upload/files/34668775323.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/vopaja.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1143354f7d93019ce7b9d63ae0315a29/58111365731.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/45522467398.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/josowivo.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/70467313747.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/93726536830.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/sunonane.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b50264e3d5---rixonediweruvi.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/35178556063.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/2212d16097693f3b3663173fa8c4c197/wibiburorolukugu.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/zujamizokubudeten.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/97334837965.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135d310b6cf2---90581774849.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=roohi+full+moviePDF 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_off0000cf68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77F 10060 bytes
SHA-256: d0271c7e5c6c51b9a3c6481b5b7f25c70e65fa992fad757497b98d3f3cd0efbb
font_02_sfnt_off0000fdd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD7 17148 bytes
SHA-256: 163c3d5a095a43396f5585df772cfa4cc6d280462850e679df2f4c1dcbc7176f

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