Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea6c1da770f755b7…

MALICIOUS

PDF

84.6 KB Created: 2021-09-02 01:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 397a8e7ca213a24f7d87fc0051c9bbcc SHA-1: dc9066f07c59c3873519d5ca0971b06b70dda9f8 SHA-256: ea6c1da770f755b70a4d1fb55cf4a52281b481da3d1aec1f360926f0fd2fd45f
204 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a link farm pointing to compromised websites, suggesting an attempt to lure users to malicious content. The 'SE_CLICKFIX' heuristic indicates social engineering tactics, instructing users to run commands, which is a common method for downloading and executing further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://infrive.ru/uplcv?utm_term=how+to+install+custom+maps+in+minecraft PDF link annotation
    • http://gapoom.com/upload/fckeditor/file/4238654225.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/patesasivoxekokuso.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/2828bfe8c6f6d1db04c5fbe967a6a936/6664931161.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/59b8cb6c87174b2234101fe70716cb42/56576516509.pdfIn PDF document text
    • http://becskeicsodajo.hu/admin/fck_upload/file/sifareza.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/38156b94520cf5e909c27cd2260c8dd3/ruzubakekejajafot.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/96797358229.pdfIn PDF document text
    • https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/46493006767.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/6849f7bd0fabe3274ce55bda0bc20f5e/xatujepupifo.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd00de185f---bevejepowirizixozudik.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160e04bc137acb---bozolukegig.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/bb79331e51580deafc651e169b729d04/kesakaputo.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/a2faee9f846937af36b2b220268f2b50/difogitagavazenagubebinij.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608647f3293b0---20384286914.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a7e04d001---nelofizokuneselilimefo.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608319a324df2---21561011197.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/1r1gl7krke81pktn4377ja7ian/wepoki.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/givozux.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/90ba9712a57a381976d18adc438f0b5c/78035705421.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16074c867e160d---fedate.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/hqr5v723rk9e62s5mtbfeptq18/gunapopajoja.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f48bbc98f6---92405959503.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/likemolunixiro.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/vatikajafarodezufilof.pdfIn PDF document text
    • 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_off0000e45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC76 10820 bytes
SHA-256: e0cc025a32a9f061c9e467cfe632f52708e470ef15e192ef0ce0027f3a66acda
font_02_sfnt_off00011575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11575 17992 bytes
SHA-256: 8942d8f952a549b903b8e6c664cb91019f300424383c56eb5d04449f588584bb

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