Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b95e937c464977c…

MALICIOUS

PDF

89.2 KB Created: 2021-07-01 13:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7f927492b86d17ac8d3f692a5ce5c90a SHA-1: 7b91f12e6aca00d7cff8d2ea3123d56e878c6d9d SHA-256: 9b95e937c464977cf6cf8034c83484fe98c0fbe7224194d1e0cee7ab17aea302
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution through these links. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/lai4a90640far7ed85acqm0u7n/71747426280.pdf In PDF document text
    • http://alituncer.com/userfiles/file/geremejosili.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/5e3f430d60af12a7ff8af7e97127e8c9/24667665299.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d02d2db452d---14006948225.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078229081934---89563730621.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/bdab1f78de078be8688bc044ab1efce4/gikepasokotorupapi.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/a961d686d33199f6f813311ab08feb94/tuxibipido.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/8a1361f42543d1d775c7078d2992304e/xarakipokadirizile.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ca08960ac---37363274133.pdfPDF link annotation
    • https://audreyheselmans.com/_files/file/kowemus.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/432a9e07c836d761dcaecafdc9883db0/wepulofirakesixoza.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/dapasefadapaxefutam.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/31225886427.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/3f44uedph4m8j7nkhrm0fn1aq6/nebok.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/19ecmvd9vm7lfbq2fsdepvpqnr/7486820606.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec60c01127---5680389491.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/fupoluna.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d58f5e519c---387268166.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/75542911438.pdfIn PDF document text
    • https://hoongnau.com/upload/files/setoxugefekesipavumesadi.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/pagepisazivoxinexipu.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607163ed1c026---9550371433.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/04b12d794946be482545d0cacf7fa9b4/tekusanizipat.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/zesekofusu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=climate+of+west+indiaPDF 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_off0000f97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97F 17520 bytes
SHA-256: 2ee6d2187f9ae851d79732e25c9970cc67dd47452e2729ba9cfba9df748a469f
font_01_sfnt_off000127af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AF 10532 bytes
SHA-256: f960056c417673c95a6f181b3f2358cc65ffb30ebcf3c67332b562330b2f8275
font_02_sfnt_off00013fc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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