Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b775d6ba2ec5a45…

MALICIOUS

PDF

84.8 KB Created: 2021-07-05 05:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 17fe00f6cf0a58659cb2d652c70dd7c1 SHA-1: bd135e8d822e59a9c3f2d0206c8e91feaf2d8076 SHA-256: 0b775d6ba2ec5a45f665b4405353e85652b9282f3ae69f2c5e790def5a66cfc8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to numerous compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute malicious content or conduct phishing. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://baobihungphu.com/media/ftp/file/lapupogomavaguxikaxaru.pdf In PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb53c2bbc9---4247544093.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/93024855093.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/xaroruduxiruderuvavu.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d9fc34ac46a---75174228949.pdfIn PDF document text
    • https://roc.mn/uploads/files/zakova.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/ba758d3162244272321ace6dcc46ea09/jikipekule.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5df078e31---8702901165.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/zupub.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/2145137833.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/fibasalagovi.pdfIn PDF document text
    • https://emprenderem.cl/files/jofup.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609741d3bab82---52834368191.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/6c0acda26247356f758edad27c0af38a/mejuvexu.pdfIn PDF document text
    • http://zigzagontwerp.nl/sites/default/files/file/70393638889.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc56c441fbc---22641320326.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea259214de---viwelowigu.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/5c820a6807380873ed8d3fdd47d52ecf/bonele.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/544da4f1db03284e06d10d1a3556cc89/mofuto.pdfIn PDF document text
    • https://saporidelletnastore.it/file/bekupubu.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/43195183415.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/nadalibovesaramojogug.pdfIn PDF document text
    • http://chineseclothingonline.net/File/gixozodinamobawirat.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075bd2e61263---52346846375.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=causes+of+avm+rupturePDF 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_off0000e992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE992 10476 bytes
SHA-256: d64453bac5a26b0cf1a999ba61d4f1e6a84707fb2fa03438fd1d83129be73c5a
font_01_sfnt_off00010179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10179 17180 bytes
SHA-256: 10cb4b63ac36b7f46aa7e171e69b823a71d24e17dfb3351a43d7c10152a68c2f
font_02_sfnt_off00012e10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1