Malicious PDF — malware analysis report

Static analysis result for SHA-256 776bd964cf9b7c76…

MALICIOUS

PDF

86.7 KB Created: 2021-07-04 23:11:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f40b27ec874afd41c8a8da0f083ab07e SHA-1: ef8b45b978a797dbc468fa5862ac95e074dc110a SHA-256: 776bd964cf9b7c765e59464d2a494482d49d6e00fce63b80f5be172558cc8198
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded links are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://414movement.com/wp-content/plugins/super-forms/uploads/php/files/8018b294bda548883a7dae365b2e2020/13967528545.pdf In PDF document text
    • http://m2m2design.com/userfiles/jinusoboruxeloroxosikutax.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90fab1a99f---nabezol.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082b7ec22d92---72018696287.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/76822563364.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/31295899667.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/91024347329.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/b6d78b1dfb597472a480cfdc45c7df63/zolamawe.pdfIn PDF document text
    • http://valeneighbors.com/userimages/dawubun.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1606e94c91e9bc---saferojugaluzibugagef.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/23762368392.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/c84152f4b041ecf0cee038c0170e036b/55020856790.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b69d62c1b---55444740922.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/woxobewiditafuguwera.pdfIn PDF document text
    • http://chromoink.com/updates/file/37045960475.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/javikezexoxupadowagadaj.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/1bc6b16855769527978c850b30573e15/kupugokoluduvuvovalonak.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c45ecbad7d---25672839255.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/de4765b603f6f12de5570e26dfda109d/42394823311.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/8196239237.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb516cec23---2298796121.pdfIn PDF document text
    • http://texmet.pl/userimages/file/nibexaferejukutobejikaw.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/7ffcf330dbc886c53f80f3f16729a6bc/wusomupelugigowo.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5d1a1eac5---55281092021.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c403997ae63---24906488649.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/3b59d589270d4bd434f19ebb17ccbe75/geruwejinetusubup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=android+cannot+obtain+ip+addressPDF 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_off0000f327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF327 16288 bytes
SHA-256: 797df71f4c6b663b564ae20af4927c237df50ba65980cee1805cb4ae7a944ac1
font_01_sfnt_off00011d5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13575 10580 bytes
SHA-256: b2b07ce5cdb6ba5aaa15224c443d44bef12bc4eac63427bca6094ea38a7dedbc