Malicious PDF — malware analysis report

Static analysis result for SHA-256 936fd8a06186af18…

MALICIOUS

PDF

83.6 KB Created: 2021-08-31 22:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1cdc402061a56ecd8a3395eda8e6efad SHA-1: 0d9a2a0f0d6a310088b8612fe9cc45bbd370c7e4 SHA-256: 936fd8a06186af1809af7f4fb3453e42bc66238bab5ca82ee2945e52f951667e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous external URIs pointing to compromised CMS uploads and disposable hosting. The document body is unreadable, but the presence of many URLs suggests a redirection scheme, likely to facilitate phishing attacks or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crysiq.ru/uplcv?utm_term=submit+ajax+form+using+jquery PDF link annotation
    • http://broadgatecapital.com/userfiles/file/32871459749.pdfIn PDF document text
    • http://sepremprod.fr/www/images/mediamanager/modevoradiz.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c85dfc1c36---nuxob.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/75489564343.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071c8ff1abaa---39555003700.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/fopuzafojopibe.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/77265667923.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/28409420187.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021081722112127.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/ralifakoset.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0d4b88d15---35145293974.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/sudinole.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/tojefiwomowokujegoputo.pdfIn PDF document text
    • http://inncredel.com/uploads/96115102138.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105bcd168796---58133594612.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/1c51e6e494807f41f9bd6396b7d1fbaf/48823384189.pdfIn PDF document text
    • http://websurin.net/UserFiles/File/63054663274.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/10757057968.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/ce5a6bd385289f30ab511a8e45bee0ac/50134963741.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/ae930c48dca822e809e17a76fdf801ce/sonururezokerobuze.pdfIn PDF document text
    • http://rafaelokazakov.com/file/663257754.pdfIn PDF document text
    • 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_off0000de67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE67 11320 bytes
SHA-256: b3e2b68d154f630213420277c4c67f32aaa9122dac448d61a91d3e80f408cc81
font_01_sfnt_off0000f8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BA 18084 bytes
SHA-256: e6dc50b9ee2296d5fcb10b00274998e6b1dac5208570a26b0b3220cab9a53894
font_02_sfnt_off00012858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12858 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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