Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddf035a57496ab70…

MALICIOUS

PDF

77.2 KB Created: 2021-09-07 18:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c0f2c603fc0055305e0a14c87b2efb35 SHA-1: 50286910d67020934b6086fe302fb8477410dfbf SHA-256: ddf035a57496ab70e4a96771eb812838691853b0aed1da1afce43ed6ce6cca13
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or redirection mechanism. The PDF structure itself appears to be a link farm, designed to direct users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/60cafba51a775a500bebe9652e4bf193/82929023490.pdf In PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/36465959667.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/38616634074.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160983fe31240b---ruberenirovufolomuguziw.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/vovofavugokukudakope.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/23107278764.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/gijufiloga.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f899f6da9b---80493249762.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/dobakotatadupegobapadugu.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/16422235840.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/86ea8e803ecc1228f68aee2f20ddbb8d/97906897825.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed97f6316c---25115156452.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/difevagofuzovexinupu.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/43584968314.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad4825d4e6---11828934466.pdfIn PDF document text
    • http://sadrainsurance.com/UploadedFiles/New/file/vexaleli.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/28608521410.pdfIn PDF document text
    • http://iberia-ex.com/images/blog//file/megarurek.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f60548265d3---zisipegolaxomovegan.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/anlbatp4cg7b6r2186eo1ag458/nonokaj.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210613_28BAC6F21ED1B45A.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/98787098272.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/b9tefc0d2o3skns0gt2boucau9/kikukipinuxadawubug.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/17682432892.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/796f61c3dfdf708d903329e6ff3c1dbe/23033981031.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=reading+comprehension+worksheets+for+third+gradePDF 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_off0000cb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7A 16316 bytes
SHA-256: d35248dd58dc46cdc74ce32bc6c3fd860d5486608cb20f3de66ab74aa9b22623
font_01_sfnt_off0000f53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D56 11244 bytes
SHA-256: 2202129dd04e5952c97e9c6b695faafc97e94fa76b86cfca06747e9caa018a96

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