Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d0d7888a20da066…

MALICIOUS

PDF

77.5 KB Created: 2021-05-12 11:54:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83996f624c34bd9e17deaa69b5e38102 SHA-1: 50d002c6715429bcf150b0566bba5b0d2555176a SHA-256: 8d0d7888a20da066f5528cc0e8b9a3942bc21cc95389881a5cec8bd4ef33e9aa
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. The heuristics indicate it is a phishing lure related to payment redirection or a callback scam, aiming to trick users into fraudulent transactions or divulging sensitive financial details. The presence of multiple external URLs, some hosted on compromised CMS upload directories, suggests it is designed to lead users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://nomylo.ru/uplcv?utm_term=introducing+colleagues+via+email+template
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160940985ce1f0---pamagora.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607824b9e1762---vovuxebumibepuze.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160989717d4360---wuvorelasusepibimulofe.pdf
    • https://luyenthitoeic.info/userfiles/file/87053138334.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/80466c0903d43e5c9e8cb1fd80de7ac6/luvotiniwi.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089adc24727b---32559539014.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160893a1f72c08---87513092835.pdf
    • http://aep-tc.com/cache/fck_files/file/54519218689.pdf
    • http://meble-tk.pl/userfiles/file/vaxavomuw.pdf
    • https://mszukam.pl/dat//file/fawovareveb.pdf
    • http://humanitool.ru/userfiles/file/vobosufadesoxipe.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/62lnno2nussdb0hjb8io250kug/86388304657.pdf
    • http://romanakladatelstvi.cz/userfiles/file/48881096191.pdf
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/eq64ujo0o6nf7n538pi8tfqt6c/modarumimizup.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7c4.bin
4d181b38176388ed811163319538bd2a337eea33b2f5213a709a70806a672a5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C4 5272 bytes
font_01_sfnt_off0000f99b.bin
1401cfd1258939a74bbb75a6d71a768ab7ea90e56621339fb76f9b93a7587fdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF99B 11008 bytes
font_02_sfnt_off00011f3d.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3D 4324 bytes

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