Malicious PDF — malware analysis report

Static analysis result for SHA-256 2adf0f32fdb85237…

MALICIOUS

PDF

75.4 KB Created: 2021-09-04 12:34:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: e1462722c691e83d0e6f4017b9730981 SHA-1: 62fb6bd838f31317735c7cc2520f86335c7cfe63 SHA-256: 2adf0f32fdb85237c6c024aa76584aa4e29b580d40fcd7a1ee99777074564e4c
164 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 and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://acudrved.com/ckfinder/userfiles/files/fapakusob.pdf In PDF document text
    • http://sdds.be/userfiles/file/22819230237.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/037ce16c1e7c6174f0a9cd8a39d226fb/fubuzadexuxajejaxa.pdfIn PDF document text
    • https://bachson.net/upload/file/50723740783.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/7l4aar8qugtrk7q79k0m95r174/68549144351.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/0fcbe7747072fa912e0a1c1e7e982589/rikagarenofamiges.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/obt7ks1ntki8gs40ubp4btnq7f/dozoxexesoniwilesure.pdfIn PDF document text
    • http://smclassof57.org/clients/34860/File/ginujijipigifoz.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/89488910317.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/cb7901bae4f3940765187aa3eb297271/25713251772.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/82545277117.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/pepukivujozipazopev.pdfIn PDF document text
    • http://amandamaitland.com/images/file/xezukeko.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160904dc4e4785---jodin.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/gidulisebojotalasiw.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607366042332b---vigatoxiligasasezos.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/jutizavebebobaselepatab.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5eee4297e---8340301626.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/zurezori.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/nelewawarun.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/49161781622.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/gimedozanadipajirumode.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d405bf9fa8b---81460368983.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/o3bi5j8o48gslk4gk59opdlmd2/vewiwerokugagupi.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4fedb5a195---83469088808.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/buwopuvimevakobalim.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/pibusezelowudek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=haynes+repair+manual+reviewPDF 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_off0000c8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F6 15324 bytes
SHA-256: f8bcf6c74406d27c75c9cb9eae2c5daf02488469b03c1f88ac577fd2da77c914
font_01_sfnt_off0000efe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE1 10552 bytes
SHA-256: 936abb5f494789ee1b323f60c80665275c84a99a96f66106611a13dec47d1207
font_02_sfnt_off000107e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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