Malicious PDF — malware analysis report

Static analysis result for SHA-256 4789bd7be66a34f3…

MALICIOUS

PDF

83.4 KB Created: 2021-09-10 09:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5410052cb5eff668492bc97652a6d128 SHA-1: 2952e7253cf28cab012350a446d9ebe3c65c46cc SHA-256: 4789bd7be66a34f3dea7eb6e2a987d038c6a23dea91c167d8ae8eadf4c9d7b94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://garglob.ru/uplcv?utm_term=five+nights+at+freddy%27s+2+game+unblocked PDF link annotation
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c3b0adea2---37462593476.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/18818752855.pdfIn PDF document text
    • http://runo34.ru/attachments/file/22953230367.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/3579787202.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/bidarabuduwiwuzize.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/92079925248.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/38161364524.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/zedarezosefoxegenurod.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/tapijasinirudawezaponekel.pdfIn PDF document text
    • http://usatovl.ru/upload/fckeditorfile/25227748532.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/xadute.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/38705067067.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/kofozuxepapimepo.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/67295516750.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ced03c59d---80761653737.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/32237401362.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/tosavowi.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/15495313948.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/76990636643.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/mibaloduxalimada.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/zolaguxisu.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/98da0c188be05e5914a9464bab8d52c1/vategofobeverinuvi.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/59618286857.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/27334254819.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/5169480789.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/e73f254cb743382fd080b943dd3dc19a/72656221466.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_off0000de72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF684 17820 bytes
SHA-256: 20605249e38c667357712644b0e3827d3b82a64a47c568f16fb17278f49e53d0
font_02_sfnt_off00012432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12432 11564 bytes
SHA-256: c6cf092b6a3d39df96b5eeaddcfae48dca76c0b11f7dc64f6a7ed3e71308953e

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