Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ccb8441f9c42580…

MALICIOUS

PDF

77.0 KB Created: 2021-06-01 17:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0ab96e927d6d837048755561791e27c SHA-1: faa7378dbce1d6d1215b41c5a4be543dc5e2b87d SHA-256: 1ccb8441f9c42580b23b7a557648fddd3b32174180bbc87b3c0a189422503ebf
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of multiple compromised upload links suggests an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8905

Heuristics 5

  • 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
  • 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://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea263efe3a---rivizatotufasusumarajelol.pdf
    • https://ksuskalology.com/images/file/rajemenera.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084c1c37dd69---xasilizededesidulidag.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/594ecfcb87a09ad4045e3531fd60369e/fimexijuzurat.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/a58617a9e88e53a2a95a322f7954c54c/xalorijipudeposu.pdf
    • http://sacoorhealth.pt/site/upload/file/dotowe.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c2910fc36---78971734058.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a942ed346b2---pobedibifemofuwi.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160784b065f905---62920666275.pdf
    • https://alternativecarrepair.com/userfiles/file/jowafiwezemetu.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160878ab86d31e---lituxeravaxakobuletejem.pdf
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/26a5aa4af88f776659d0904146176fd7/kofasosexuderego.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/bbjncrkdlnm8ljqh2tv0q9rs82/kofimovuperu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=ejercicios+gram%25C3%25A1tica+ingl%25C3%25A9s+1+eso+pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b45.bin
8b7108ace6dd30f1f2e898fa6717ababd4d22ddec98e3d4751af96e18941b28a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B45 5936 bytes

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