Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd330a18bd491797…

MALICIOUS

PDF

151.0 KB Created: 2021-06-30 23:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c5ee6c5d7184fb7125c5beb7c6caabf4 SHA-1: 05c966f4e40550423529f0c1ba6cb47d8bc9fbbf SHA-256: dd330a18bd491797c7f2aa9acf3108253682362072a371446f15a1bcd77d3596
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the link farm and the PDF's structure suggest it's intended to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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=in+confluence+meaning PDF link annotation
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160763c87b7b33---99228189385.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb91cf1cfb---tiloxewajuvikemukerekubu.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607af63712378---kadebixeve.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/84d08b057ff0b1ad13a9a3e9aca49c89/24037131305.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/rukirolusurarebasepukipo.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b52370ca04d---27731542972.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/99ae0b074d5b3e79e75643e0391364f5/laletuxe.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16097629866c1b---pawuwovuzukigesag.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/ziluxezufolafowutofeguxut.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/23674706205.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609180ef83ba8---6093219246.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/h9hin6a6gpoigfrfocpgb07uui/43458347995.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/99d0228e62de2e0db342f018369d5a02/78899145948.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/nibodiletifisapirugawofu.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/refenikofasexuxapov.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/top8i3am4d5k01ej94vke7j5u7/tesumevibomolu.pdfIn PDF document text
    • https://chogmai.org/ckfinder/userfiles/files/zatupusesin.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/gexajalosojesewofu.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105211018.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa91573fc23---timalop.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/476379328.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D1FA 22684 bytes
SHA-256: e35fa2cdbc4fad3fedd945efdcaea52d855bd1d00ceabec52cb7f264b609d9b9
font_01_sfnt_off00020895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20895 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_02_sfnt_off00021ea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21EA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000236b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x236B7 10364 bytes
SHA-256: 7b7f380de13a279b7f0ffa5c4c9c7d6ddb849ff5b3009accff9bd96b26ec1494

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