Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dae18248aa519f8…

MALICIOUS

PDF

91.5 KB Created: 2021-09-15 22:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cce758f5e5e0575733076e24b7921b7a SHA-1: f0c4f7c6cfe5530960fb33c501d7b6a6e2a542c0 SHA-256: 0dae18248aa519f8a48ccd39ad4c0fb1d030c91684b4adb9774f37cc3cdfc1db
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of a link farm pointing to multiple PDF files on potentially compromised or disposable hosting further suggests an attempt to distribute malware or conduct phishing. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://okfilm.kr/userData/board/file/mototuviwopafatuvapisuvu.pdf In PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/pururovimodulovewe.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/54213377581.pdfIn PDF document text
    • http://soc-in.com/data/media/files/dekonupovofegipigow.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc864c6428---bubajijol.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/936e30ff5035fb50f10d475ea0e0c2b7/83797046679.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/71102826707.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/edff2412f686a729bf60ca97931ca049/70237264704.pdfIn PDF document text
    • http://ore-processing.ru/d/files/biginivekajozo.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/65187323830.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/20126060619.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161375bb547fad---derujimug.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/jabujuxuvelasefafopejigi.pdfIn PDF document text
    • http://school15-tyumen.ru/f/77047340793.pdfIn PDF document text
    • http://keacg.com/upload/files/jimif.pdfIn PDF document text
    • https://izometal.net/mm/file/fedijofuzegujawaduli.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/27441915128.pdfIn PDF document text
    • https://hongming-eco.com/userfiles/file/21139747504.pdfIn PDF document text
    • https://taperagi.com/contents/files/lezuf.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/20ea9710064ce626525a719f85a09892/72279925533.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/lanejesusedetigekugara.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/89419939277.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/metubajazu.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/48283467327.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/4e34a97bde59553d92edec286b6f42f2/22640581263.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/54878615253.pdfIn PDF document text
    • https://faceless.me/userfiles/files/6692680493.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=redmi+8+good+for+gamingPDF 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_off0001002c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002C 10640 bytes
SHA-256: 96579cb5e87fa8396fbbaa760ce5d0a28cb3527a34567602ec22222d58082da1
font_01_sfnt_off0001183c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183C 18636 bytes
SHA-256: b02d4bc675197aa97e193a3820f3d9b5276f8c0cf560285542cdb4135aacc152
font_02_sfnt_off00014867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14867 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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