Malicious PDF — malware analysis report

Static analysis result for SHA-256 394f45287637687b…

MALICIOUS

PDF

87.1 KB Created: 2021-09-06 04:36:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 06a695883b37eed37b190e84fe6413e3 SHA-1: eecffeb084e5552977418a58ef41aa7f063fabd3 SHA-256: 394f45287637687bb882c877bc578d97fdb81fe0b169cc8c17f5a611b53c57f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links are consistent with techniques used to distribute malware or conduct phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crysiq.ru/uplcv?utm_term=modern+age+of+english+literature+pdf PDF link annotation
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/iep1pqh7bsvmg22djvb35tjcj2/62762900517.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/188ii7350o6e4c64s7mj0ambkc/jirajuzuduboku.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b72f240a6fb---36351915503.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/dd1608fef375493d0fac1bcafae5e540/dexufegiromumatere.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/17640343649.pdfIn PDF document text
    • http://altinay-law.com/images/file/zuxomexol.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c46e1be76---rotewekazojaz.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/64987746815.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/6cafb27b5274c6b6e609f26330c58512/jewuxidemijuludubajek.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/91529802698.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/c0822a5006f5ec4b2c9f5329cc82d44d/97228597922.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/79fcc0dc80a346bbe34f048c35d4eb96/52646074766.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/45457562594.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/faruguzoxa.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/ad6dv7ef7qg72feal9esvh9d22/43157585740.pdfIn PDF document text
    • https://abeess.com/userfiles/file/11476095100.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608671cc2e70e---gafudawotasiv.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073e4ee039fa---gavoxa.pdfIn PDF document text
    • http://waypl.pl/upload/File/6774752291.pdfIn PDF document text
    • http://ahs1968.com/clients/d/dc/dcea35c349c70fb55dca458fc6558ff6/File/25774139848.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610740a608fa3---bapexi.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160850176a458f---10896753994.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/sepava.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/2e5c01588f96466b0d0189d60e33c73b/jozusinotinuxax.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_off0000ef98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AF 10872 bytes
SHA-256: e62efa73bd575c9d64617c1075abc0f7e472eef724fb650eb9d7e281eecc84bd
font_02_sfnt_off0001207e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207E 17696 bytes
SHA-256: d255d2f09e79b0d7e374278176bd14c5b919f495c72652231160ae8f617c0096