Malicious PDF — malware analysis report

Static analysis result for SHA-256 67f663dc0babf36f…

MALICIOUS

PDF

65.9 KB Created: 2021-06-09 15:42:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd9cf42f31e9af30eecc122f668b8351 SHA-1: 670558ab04970fce31e41a9669641c107c6a8000 SHA-256: 67f663dc0babf36f62a998d43816dd466fba59b861e9c3ba6a3dad6f55fc6cad
154 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a link farm designed for SEO poisoning or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to distribute malware or lead users to phishing pages. No scripts were extracted, but the embedded URLs and link farm structure are strong indicators of a malicious distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7604

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 https://catamma.ru/uplcv?utm_term=hacks+for+roblox+arsenal+aimbot
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607915ebec224---mekivafovol.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/5bf26ce9cea9405a3f231108e283e0b1/8415871668.pdf
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/78de5b389c2370a88ac8979bdc7677fb/valixegiz.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc6ae4bbfd---12416366942.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7a136bb99---45725587182.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160923f7e6185b---zofolutofatatiruni.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/jifr8e37vu09lc28u9noi85h00/90488298726.pdf
    • https://airbays.com/userfiles/file/70754017342.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/uegs0juak04mtk0i092fv1np8i/55910832636.pdf
    • https://mednet.mk/public_html/upload/userfiles/file/62891669454.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/82326a285f0acb62ec2007a82e463df1/46971070704.pdf
    • https://daaeportrett.no/upload/file/54778365651.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c269b01dd7---porigazuligupibebutuxa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e367.bin
fa72874b8c381873b432d3b5cea9ecddba20f04e8e1c9face7d560df1136061a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE367 6588 bytes
font_01_sfnt_off0000f3e1.bin
1a2498b6d9982ac0a709492e6ced4baeafea9f9e0b20344c05e04529fbc44d70		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E1 5260 bytes

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