Malicious PDF — malware analysis report

Static analysis result for SHA-256 98b031f399f843c1…

MALICIOUS

PDF

100.3 KB Created: 2021-06-27 15:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 81de2d0e5249e03c5152d22a37b2c145 SHA-1: a146d5aa6e75748756d9985afee1c4a880baa530 SHA-256: 98b031f399f843c178cfb4d1040fd6b3cf597feeb5f9b362730e4094b5a355bf
164 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised and disposable domains, a common tactic for distributing malware or phishing content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://arch.ua/ckfinder/userfiles/files/siwanusijexosafi.pdf In PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/0b4a1d40268bc747abb17c4adbf21734/6595607231.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609dac22b033e---69346693794.pdfIn PDF document text
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/ab80afc6366064e87260feaf7310f4b0/telazamepixa.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/55233409211.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/gudakovejizorujujog.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/pasasumar.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/50891127053.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/q6npe5of49v8b44980dq322ud1/xuvesefajupekabapepix.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8960ac678---24445277767.pdfIn PDF document text
    • http://bigandtallking.com/userfiles/file/bogomezuki.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7178ce8a47---69476144292.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608daccd20601---56169957134.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/boxazajamagepofulizusif.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/2cfepq489moc9ipd841uuo1lh2/sesozisasesopividukede.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/unplbn8k6thtqe40d1e4biher7/jebubofuxamiralokote.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/4000f8070655ccf5e043160ed382325d/15004282602.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/f63bb4ad5843debbc5994119a371f1fb/17565943582.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9f61a313d---pepawinasopibimumir.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/eh318b7v6moopnvji30k4bg9n2/mopawebuvuwosezu.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/41524344922.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=import+data+from+class+schedule+table+in+the+registration+access+database+into+a+new+worksheetPDF 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_off00011ef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13704 18536 bytes
SHA-256: eeded95a7c0cc38ae91044f9b1fd47b784b362ca17097d1f9d901b249c0b4e0b
font_02_sfnt_off0001685f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1685F 11436 bytes
SHA-256: 3cdad9f17414680fb170ee0b0c2f70215c87c8f7bd62b365036185dca41c616c

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