Malicious PDF — malware analysis report

Static analysis result for SHA-256 f922d1bc220d4928…

MALICIOUS

PDF

79.7 KB Created: 2021-07-03 15:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 4b0aeec3f066212d205894511edaa12b SHA-1: 47c89400e5618b2d849282033a2c548d49209f67 SHA-256: f922d1bc220d492856130a47360c04774ed1e68fb3a085a3a1ef201065636fd9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm designed to manipulate search engine results, likely to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://led7.ru/file/jonakafasifakexus.pdf In PDF document text
    • http://ndt-tl.ru/upload/file/91249927939.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/42064836078.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f45ad81c305034e9c3e9a677b549c737/32685600075.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9b9ea09b9cfe32cd355cc7cac3a11531/repatikabetosewifugodoxal.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/62647743363.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/nisuwavaxujunumexigim.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/napeferovadanenazu.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zonupixababumefidixipe.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/48650845508.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/fobax.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/ii4tde11fd1hq581c26dlq7fu8/92805235307.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6a8c5bc9a---guzudakagitafufepodili.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d4f00958c---nigimujegunugilameloku.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/5956e54ff4dfd415a4c4dccc0aa6cc25/75919503978.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b402bfca3ec---31887585291.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/fajulorogakowomomutax.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d578b2155a---tipus.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/kalubusidemab.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071313459434---22771707755.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5839d5591---vewojavuremezikonawuk.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/63604557337.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca09196610---87154434194.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/abc4a47787d39b4527f21ab5c96dc3ae/zejajunelokazeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=grade+5+exam+papersPDF 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_off0000d658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD658 10368 bytes
SHA-256: 2fcab7de03b2c35a9f892941eb2c0258b4b466315a876c12ad3290053a9f0afe
font_01_sfnt_off0000ede0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F2 16996 bytes
SHA-256: 3759cbb0c27a2bc332ed90cdc08bdf7a63b40f5d7055900b0913a847e62368f8

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