Malicious PDF — malware analysis report

Static analysis result for SHA-256 7adb628b1c16314d…

MALICIOUS

PDF

78.0 KB Created: 2021-05-03 18:55:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b871af375f880698a0beee4fdaeee612 SHA-1: 44b7c47ed2ffd1036afd80cedca0a5f597e3f792 SHA-256: 7adb628b1c16314db566900efbd20a586e35aef54cfdc3e06c474e467e0280ac
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to compromised WordPress upload storage, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the embedded URLs and heuristic firings indicate the document is designed to redirect users to malicious sites, likely to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8211

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16088abc207ccf---98687117100.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2b200cc3f---20745059082.pdf
    • http://aldara-latinoamerica.com/userfiles/file/8101872800.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16083287f2624a---xogatadanakigabade.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160847c0dbe44e---37163454266.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/561b70592508e51ade9f88f381f8af74/78365259611.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/7kbh71guan80dadd8elpp7t7j8/16119844184.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085b99139fb2---89013659499.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c938befdb---45548829534.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/d65277ab3a75974db3bd72310bfd4178/gatunewivevobedowoda.pdf
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c83655c7a3---12563037159.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841b18909c2---vixakozekeveb.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/e6feda87938b56005938fa4fc38bd733/41081455833.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2bd5d6ec6---pixoxi.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7ee6e0bf8---56532114949.pdf
    • http://akinmedikal.com/uploads/file/48546309556.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/2709e7b28d76d0586a0f40194fd16d09/vominuzazibikodetugonofo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=ambasamuthiram+ambani+1080p+video+song
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109cc.bin
7cf9f631557d096aac9df8586ae9d11c3a74d66fb680e34c462a479c511f4945		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109CC 5916 bytes

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