Malicious PDF — malware analysis report

Static analysis result for SHA-256 d476169486fe2d30…

MALICIOUS

PDF

81.2 KB Created: 2021-08-30 06:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b01506c08eed100c168a156781521047 SHA-1: 1fa5af5017ad51a3cc728951453b2bc92b721358 SHA-256: d476169486fe2d3064a4e13e973cb4474f2bc51f556c82ffb1240c0c5df08bd7
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classification and ClamAV detection. It contains numerous external URIs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm or redirection mechanism. The primary purpose appears to be directing users to external content, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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=write+the+chemical+formula+of+sodium+hydrogen+carbonate PDF link annotation
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f75875a59d---lizaxivixenesudidodizakov.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/e47e0ab119c5c81252e5caa5cde2f06e/sison.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ffabe684a0a---votuxadozodoja.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/jotidajopolo.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/95ed556303da0807040d55d6a623270b/kopaza.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/zuludilekakugekumaninebe.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ac7e05a82---figefumujifisike.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/jimawenuxukivaruposenabox.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/damovapakifogusefepojum.pdfPDF link annotation
    • http://video-cycling.de/files/file/vepovuxuzovetiziw.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/divonakudumadadu.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/lazibelazagibiv.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123c0b06e598---kilumodifevasojifajejug.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/lcraglvdem2esa4ofq1hqnmnu6/90913626055.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/58841496512.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/a1e34fd52d8e7c1303d8209a1b503af3/76468013876.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/36725768827.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210601023135268904xfmrjf.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/e6953aa8849fda80b5e9df26eafcb7c0/wisajisijuxufigutilu.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/25484560564.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/riritixoxupovij.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610090567b2a1---giduzawodesatere.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/webunifa.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_off0000cd50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD50 20776 bytes
SHA-256: 33a712082492f05fafb87cf348d56cbe8c20f5d86fa1eee1c986094a3d0b6ff3
font_01_sfnt_off000103ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC5 11268 bytes
SHA-256: 2a156199c53d4e13ccc7fca9f7dacf2b4b1d124e57705fde966be71cfcc935ee

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