Malicious PDF — malware analysis report

Static analysis result for SHA-256 ded22591df7089b1…

MALICIOUS

PDF

110.0 KB Created: 2021-06-26 23:12:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 91de95da3733dc4e858d3f335e50ccee SHA-1: af1d5a8212830e370b70b16bd40e5c3e12180316 SHA-256: ded22591df7089b141740eb35df9937e9bbddfa5603fe939f57e819295a810f0
204 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and is flagged by ML classifiers as malicious. The 'SE_CLICKFIX' heuristic indicates social engineering, instructing the user to press Win+R or paste a command, which is a common technique to bypass macro restrictions and execute arbitrary code. The numerous links to compromised WordPress sites suggest a link farm used to host or distribute further stages of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9666

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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 https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/qv48sm9me8dbe3rk9ke6pmc9e4/7019755771.pdf In PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/f1cb1813af300cf763bd572afdd4a264/sofarenatofujed.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/57863434e6a37d7b5c7c98ca4d781e39/35605871922.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/8f20c8f167a0243b6dfee6f326964d6e/46924268496.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/04a9d77759162be73cd32b6815bf4352/46655532772.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/9764488e49d4aef939f762abe34502c3/wifomodagotatebar.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/bezirixa.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/69hqbsspagg9kacb9pit6oa09p/wafaxanavinusawu.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/53864479289.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/5e167c71e2661feb692bd81056b1361e/70934877079.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/hvhk0h3o2qdldllibv29h28iem/pavunikoluvafisobifumu.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/mnleqff5cuk4lajhlccng963s9/nunen.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/vamojukurodebedowebon.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/db3d2e310cbbf61bc63978c1ee3ba8e1/55466584522.pdfIn PDF document text
    • http://rogo-rotterdam.nl/files/45223611084.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/67104787356.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/614d8bce47f4f9a14bee70340746942c/29666386587.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/83096007424.pdfIn PDF document text
    • http://gfhs1978reunion.com/clients/56625/File/26606061605.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/bitukadipemotosovabi.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/f50ac870840cbd808a135a9830fe2e85/bevedopidemezorupogej.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/zisojevatitazijokujotawob.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/ropesiboximemosuxutonawi.pdfIn PDF document text
    • https://actorconseil.com/files/file/kixamawomovajek.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/eium18tp4k0hvssp74nttid4j1/67582827832.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/94156dd9d76f66bff79f0482b6ef0ce8/vewodowetikan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=manually+change+screen+resolutionPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15518 10716 bytes
SHA-256: 858fea0e8b4cbf4822cf6aa376cb40133a9a3ddaed086086b72ee3d8700e1496
font_02_sfnt_off00016daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DAF 2472 bytes
SHA-256: bcf3f8b747d6d6b55bfa0b052fcabc7a7df9ef2be6e4f402231219905b3349e0
font_03_sfnt_off00017860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17860 18672 bytes
SHA-256: 318aeb7c7fa9920e5026147d01a0426ad2b484f001b744ecf19fef0b7a682070

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