Malicious PDF — malware analysis report

Static analysis result for SHA-256 df0667f4c9b57909…

MALICIOUS

PDF

75.6 KB Created: 2021-09-01 07:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c6305c3eb999417b01066326db09f356 SHA-1: babd7db6dc2869bee8d1d8f704d6f33900ba0d1e SHA-256: df0667f4c9b57909c0d9f0803c9e4fa33efde120639699c27639096aa2a31282
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Numerous heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting. These links likely serve as lures to phishing sites or malware downloaders.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075cf2c0d9c3---67058719024.pdf In PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae7c813827---26904941171.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3142c1b54b---30273804100.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/fobununefujiluduve.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/f351bdb840e3f17f9cdfc4991a1aae6d/rejubopupexolukem.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/rezov.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/83247733597.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac65046ac9d---lenogodixafurixub.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070f508c4f03---23750921423.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9340c8f50---70516986155.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/rasug.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/dedojikogafitabaz.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/nowowit.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/be398c159ac06034fbc6ddbffdf2d85d/77138512604.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dde1a36adb---49400893996.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/ftr72ibr2lhrbfj20ulibm5js0/rejib.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/e1f7417655ac431b63de78f2b9394c54/61227900495.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/nupuzare.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddac02f192---limamimugutowizuvuberef.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/58025005972.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/vifosipeteziguwitesapi.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/69857855556.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=jack+and+the+beanstalk+summary+with+moral+lessonPDF 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_off0000c5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A9 11156 bytes
SHA-256: 03346c08cec6e3b4964f7e68ae7e3fc51bdf709e9ee657fc563d2c12ec28513d
font_01_sfnt_off0000dfa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA5 15772 bytes
SHA-256: b15c75d1c81a6cd435900a0520fbe0f794e7300ac1d55a150302189bf64b1a24
font_02_sfnt_off00010792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10792 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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