Malicious PDF — malware analysis report

Static analysis result for SHA-256 daab74b6a9c8abd9…

MALICIOUS

PDF

110.4 KB Created: 2021-08-12 01:52:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5ec5a62351b029015161b72517eaeb04 SHA-1: f5f55ace00594a5a76b1dbd608e2b5fcd7c634db SHA-256: daab74b6a9c8abd951f9cd6ddb1edc307071ce264473a9742228e8052352c85e
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of multiple external URIs and compromised CMS upload links reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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
  • 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://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/1e419c4505219b20bae17027d3ebcd81/gegivolozakelugoleta.pdf In PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/42d82acdb6dd18537b18f6c7c6a5af9d/65359934474.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/b4a5feb1c746f8081e0b8fb700380099/21924686585.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a1b53fe69---kafizinesaki.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/lulepazilolulotumekikob.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/46704969365.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da7c7d8689b---sexujozuluboguwiwavibiva.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/98533942905.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/b169d01a50e75a741fab53824efb4336/28637477286.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/75888766752.pdfIn PDF document text
    • https://yasacompany.com/upload/files/53804337388.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e18292995b4---56452347169.pdfIn PDF document text
    • https://digicpictures.com/downloads/80974400907.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/kuxunisobupid.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160da7c322ff1c---dazonijaruxoxukijowurip.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/pagurawulem.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/3ddcde5d36f8e60054b8427853550420/66542059506.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/f2fe86643f4a99add180d0148aef35a2/5925527989.pdfIn PDF document text
    • https://srilangkapools.com/contents//files/bifinafufixosusixe.pdfIn PDF document text
    • http://gyobel.itpublic/file/15085793384.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/62206710307.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/15798506731.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/tujefemijuvolugotiwavajer.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/gozinuvulo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=silenced+movie+eng+subPDF 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_off00014c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001641f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1641F 18112 bytes
SHA-256: b315e0b69c70d38444a16a34f43c5f3b5e550af0acc19ffcfccf87c7a3af0295
font_02_sfnt_off000192cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192CF 10736 bytes
SHA-256: 828ba3a7f5f7839674b905fa3ed8ee5eddb93bc9c537a74b60b94507796f92d5

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