Malicious PDF — malware analysis report

Static analysis result for SHA-256 9721923b4dca640b…

MALICIOUS

PDF

92.1 KB Created: 2021-08-01 08:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 4e9aadbf143e514790cc8cdfa2ba4e69 SHA-1: 29ea2fb89066dc5fc87b87cf977af933737bd84a SHA-256: 9721923b4dca640b05304e26c7653e2df4cffed5cedfed67077fd8f8d76fdb65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://proxima-design.cz/files/file/35871535223.pdf In PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9c7f01ab2---57682197290.pdfIn PDF document text
    • http://geraldkleinlaw.com/ckfinder/userfiles/files/godunuwabitilujafojig.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56249971764.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/gadajut.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160de114e4812a---moximevilivilulilez.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608468445ff78---zetefurotewinuvanizewu.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/g6u87bae12sf557u9jst9thi9v/69098374997.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b210297703f---jovetarefosenetafuta.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e5692a151---22936252027.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/6472072323.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160fabebe63b4e---90260981115.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/45777543954.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/40450141131.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/68276685404.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/53054166069.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4b2b3b698---guzagosez.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/sozamokikilimenobejimi.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/mumerixuxufenilid.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/57509795319.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=descargar+whatsapp+plus+estilo+iphone+2021PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE783 16856 bytes
SHA-256: 784035a2f255ca8a0ad9495bbd287f92eba1c6f23ee56467113f6a95693dcf43
font_01_sfnt_off0000ff17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF17 18880 bytes
SHA-256: d4a8ab344fa71fbb2406fef1f080e4e3efe111e9bb6085e5ac13b5eca0ccfb5f
font_02_sfnt_off00012e7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7B 11132 bytes
SHA-256: 5edb915fcec08d35a458f08a896cd30c5c22114ce96fde1ff76773fc820e2cb4
font_03_sfnt_off00014899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14899 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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