Malicious PDF — malware analysis report

Static analysis result for SHA-256 e053bee80d9c2da2…

MALICIOUS

PDF

81.3 KB Created: 2021-09-06 01:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 5d0e1d36e212b369cb25b47d6e03aa37 SHA-1: f46420ee00da4958a9aa63feb3817354a08d54a5 SHA-256: e053bee80d9c2da2c8cd68d183707962e213cb6930aec49249b7683b7d6adad4
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 0.9981

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://viajesalaos.com/webroot/img/files/89105503067.pdf In PDF document text
    • http://hoacanh.net/luutru/files/ruxubavutedonifu.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/45262142117.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/sosowo.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/8e88fbdde540ce5b4cd4a0bc6f5ecccb/3756732157.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/90325754249.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1917d9c203---81579964877.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/detidubure.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/34925358009.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1d7077990---50729971088.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b77602d738---kepujatuwifapaz.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/2a9836e31d2a74bb211f97f68b6baf80/dixogezafelesinupin.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/31560221930.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/babagozodopuw.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/nojixejuwowinesapenex.pdfIn PDF document text
    • http://agama-rc.com/upload/files/nekadafunofapezuxo.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160978abb1a301---vexuzotivok.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad305498640---58433611944.pdfIn PDF document text
    • http://www.polni.si/Images/files/kefapudomusejomiba.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/csqqbubrkstmeipna1u53hngvh/11665001883.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16090762671f39---12784709532.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210809065749.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=all+about+space+issue+90+pdfPDF 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_off0000d753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD753 10920 bytes
SHA-256: a765134935ccbe8cdc35f057f5d253b2bcfb7f781ac4d807d51f514b6c00052d
font_01_sfnt_off0000f092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF092 17972 bytes
SHA-256: 3761b2d23e010c3c1ccd472e6236349041f78ce26a508a5917c47832a803a0d0
font_02_sfnt_off00011f86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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