Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b47df7057ffaabb…

MALICIOUS

PDF

75.0 KB Created: 2021-09-03 19:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f9879678a090b94fb141be65ad3e663e SHA-1: 2128f778f21afc71e04f3beecefc8777c2fd2e0f SHA-256: 0b47df7057ffaabb673f186db8c0298401f9b0b9f7e6a034ce5408f0fcdc11f8
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of multiple distinct hosts and a high number of links per host indicates a coordinated effort to distribute traffic, likely for malicious purposes such as phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://congtrinhnhaviet.vn/upload/files/33772986998.pdf In PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094224d53c8e---84663304556.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160bacc7d78057---guwobubenowukaka.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/solen.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed08c105f1---91031862257.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/42479c8fca2da831c43d923281dd51e1/3714056094.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/8ab2d14df7f65069ab0f9f94ace5f105/juresaselisufabitareduneg.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ec9d1b9bc75---samug.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/vesejitodolijebal.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/risamelusiju.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210725_5DA3284BF5D84CF2.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/pupinotofo.pdfIn PDF document text
    • http://mcutech.net/upload/2021/07/file/16272511471176391816.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/20285940691.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/21764445f825eb4bda0f910878ef3f23/gesojozazulojixirumoz.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608742bb9d688---sesagarirexukadewekevi.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/78070951385.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d60818c20b---kaguvi.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/8924de8f3441bc5d5c4b5dd338ae25bb/bebimaluf.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/44492583070.pdfIn PDF document text
    • http://na3.it/misc/file/dagabusus.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/28711492135.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/43281569651.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/9850863050.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=mazda+mpv+2008+user+manualPDF 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_off0000bf01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF01 17760 bytes
SHA-256: efa8fe406448d62002ed7041a04aa164e0abe8aa102bfcf862c663401a3c34ba
font_01_sfnt_off0000ed72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED72 10912 bytes
SHA-256: 605f52b45b19ace934d81dd62b39d81afc698867873cc9fd631422fa24c214c4
font_02_sfnt_off000106ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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