Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b191b81cf70a046…

MALICIOUS

PDF

86.9 KB Created: 2021-06-30 07:11:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f16e442456ac42434226e53caadebc8b SHA-1: c0aa25e6ced007a0da21924bfef00505fd689e2c SHA-256: 2b191b81cf70a0465eba67385b54e5f8b1e46fe547e8e2919319aba8d243c59f
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to multiple domains, many of which are compromised WordPress sites or use disposable hosting, suggesting a phishing or malware distribution campaign. The presence of numerous external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://grup-insaat.com/userfiles/file/34291310995.pdf In PDF document text
    • https://ahha.az/userfiles/file/paganixugogix.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/d4qihlj7ofo0i63ioq6dnfs3q4/waxebuviti.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/hduvqjcrap3mifeo10v0mndhbo/zaxes.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/rbc7m7ej7iqun0phens44vf5np/tewirulag.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/99c974c030df9a3988c6a283c0fec6f3/modekiwizogigad.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/nuforesubuga.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/39797356384.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/4b070e3cde644f5de722e544ffae05cd/74645457393.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/96601788433.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084b95d4a3fa---56515613880.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/mrkeimf0nok2nus808v8mndtdb/vazizabizojiro.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/91818929770.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608992986892e---49982414368.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/zover.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa31b9936e3---mukodapudewidalu.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/cd4b76df2a0503541198bf3bbe424d5f/97054140363.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5955e26c63---20235897650.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/jolobozumij.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/a2e26c12570b20fddc76a751b68e2a96/bogemuzamojuto.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__60D012C2149D3.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/10070080671.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/t9cprlrn1krlng6f6rd9c639i3/84225502423.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/68123709627.pdfIn PDF document text
    • https://abeess.com/userfiles/file/pavugumuro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=talk+the+talk+book+by+angelo+pdf+downloadPDF 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_off0000ec23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10435 18016 bytes
SHA-256: fe56280cd29035744606aee6bfadd6634d512aa3bd7e9779986b1cd140bfe0d2
font_02_sfnt_off0001335f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1335F 10812 bytes
SHA-256: 7669d2a665f38ce8eced9fa48f26de9e5d95e0a1bfd55fe71e46eb51d3204831