Malicious PDF — malware analysis report

Static analysis result for SHA-256 e123789d3e3d5679…

MALICIOUS

PDF

79.4 KB Created: 2021-08-15 14:02:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3355d66f04451eb9775246cd166e6e29 SHA-1: b00f994a4be800ffe4f80b0e58a7c287461a6c2a SHA-256: e123789d3e3d56799e3b799e0e59b98a97afd033bafd09ab742117f77ac4bb19
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress upload directories. These links likely serve as a link farm to redirect users to phishing or malware download sites, consistent with a phishing or credential harvesting attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://drafthe.ru/uplcv?utm_term=cheat+engine+for+android+no+root PDF link annotation
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/lccktnp2mhndundqqetho2b66m/39562879616.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5ca98e1d9a51765100508a354b5008d2/5363727497.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/11687627613.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/0fb1p3tmr4asv3vj0efvkjttq2/nibowipaja.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b3664dbdc---wutavipozotofiresivafu.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/52817386190.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/48868750800.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/fomasekedu.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160905d3352c69---dasax.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/tisowutikive.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/bdu8j1h13051rbope7ivtvr4aa/29227371383.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/149a175b7be4787dc72accc9dfec0f59/majefigeg.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa62003719---42806277132.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be04cbd522---12247405881.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/2739517b93b8ba1f7420b01a07ef83a0/46195229657.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/2a0737b5b83dfbd525cd3f0163ee8be1/tixojeduteki.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/90620492804.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d2bccdaa1fd---vafaza.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/41861260435.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d8e55f63c---32305112380.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/27805209520.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/jujava.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_off0000d44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC61 10452 bytes
SHA-256: 0dd26eb551327ee6430349ac77a1deadc09c8dcd657dbe97d05128a0779825ab
font_02_sfnt_off000103d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D8 16492 bytes
SHA-256: 7dfc9bc2d191869d225e14e0127ea663fcd32db9c7d304460c1382e07702e220

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