Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dbe8690f82d25a7…

MALICIOUS

PDF

91.4 KB Created: 2021-07-26 10:43:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: be26773a976868dccbbff219e9a33e1d SHA-1: 19875b0929dc4aac359563e443ee2e5cc0f3099a SHA-256: 8dbe8690f82d25a7ff398cae47a756746ec72e19b54616ce0ceb960fea65ebfa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous compromised websites, a technique often used to obscure the final malicious destination. Heuristics indicate these links are part of a SEO-based disposable link farm, suggesting an attempt to evade detection. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://sangiorgioautoservizi.com/userfiles/files/zarojex.pdf In PDF document text
    • https://iiml-pgpsm.in/ckfinder/uploads/userfiles/files/32278628617.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/tewuvuporalot.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/birinekid.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/r7304mhos4mblusakjqri0qllp/52872649808.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/c0d995b623b964fcd2c842a954a428ef/10253003829.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b93b39ddcc4---51378150392.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/5bfee6f9cd050ae06330a5545bb47391/fenonafakapabivegedanutuf.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/9984183980.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/91155980597.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/12603d9ef36d4d23cd85ba7594cabc57/javomulaxitedeboxuzipad.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/ds77ko3jge4pg7ubni39dajto0/bazabidowarixuwabeworobu.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8c739d4f4---35035697940.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/giruwubadopuja.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/51683317009.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/zipexetadikusufi.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/43548466331.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/29397073715.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d341a6780---58941465270.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/a44c17de1dbdd4d8a0e4ad769296242f/39546280599.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/vojabezubigager.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/e4311ch2t4jvu1qr7cmf7jt05s/48209408065.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+program+genie+intellicode+garage+openerPDF 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_off00010087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10087 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001189e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189E 10764 bytes
SHA-256: 05a9e4adfc0980e16817a16af2625ecb2d386ba03c0770bc478df3c2a9e6e535
font_02_sfnt_off00013126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13126 17448 bytes
SHA-256: b597bc4dbc2c0eeda6be79aa834b7dd1e2aaaf2de750271d3d4caf6f4b84a0b8

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