Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfa402823ab1d1a8…

MALICIOUS

PDF

86.9 KB Created: 2021-08-14 18:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 005bb7e18f90374309cab2eb2e97f49d SHA-1: 6243b78d139f86a153f9fe3818095507e1657bee SHA-256: dfa402823ab1d1a8487a07541c4fbcee3144f09ba2e67ef558c7725a98c67499
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, many pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/59e166c5089084cce6d8003418b55bc7/mipipupikatixenadelipode.pdf In PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a498898fb68---84534934699.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/kimabagekazuxagata.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed892dce385---44640802086.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/zatuzebaxazirosatuwime.pdfIn PDF document text
    • http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/guxepowowe.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/46n3n3qdmd763065nap9tmbl36/12254723314.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/64266763436.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/d9q78ckuv12jme6510pf3otgk2/wudodusivefizazuv.pdfIn PDF document text
    • https://tavio.ru/files/file/19617863847.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/8810514928.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/gedexobuxo.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/62819089583.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/83929505911.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/82060386775.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/f1097940c06da72a3a2e9830b8c9e7c7/piwakakilukiba.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/224a128a9d12600fc408ed38918d59a5/7283657792.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d4d2dfea2---jijilaloweveravo.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/85410255780.pdfIn PDF document text
    • https://digicpictures.com/downloads/80689712571.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/3ab09a7ee2828b4219feb792b7bced3f/pudikoxekutowijajuv.pdfIn PDF document text
    • https://bdsvieclam.com/upload/files/69072445025.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/lubabesenupimakufupovu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=ver+canal+cine+latino+en+vivo+online+gratis+y+por+internetPDF 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_off0000e8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F5 20004 bytes
SHA-256: a9eb1a7a154898009ea7cf27cfef3258d79b54a24c171f719876f3ccfa01f29e
font_02_sfnt_off00013227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13227 10696 bytes
SHA-256: 4f6c873f04f9d4f57f0c4e180e9f648540537c42ad4fae477b4bcc37d100a7e9