Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ab58d78e17f0ba4…

MALICIOUS

PDF

92.3 KB Created: 2021-07-02 05:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 135d1604cc89b0bf61f2541387afd230 SHA-1: 6971a2b6dbbde54b22d46680f0c78af196348420 SHA-256: 6ab58d78e17f0ba4a3c1603352ba83ac2e2639568730d3da9ec7c51589b3841b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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://prospr.fr/ckfinder/userfiles/files/79403032854.pdf In PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/24fcb4c8b627a46981996227c9570f4a/80610098445.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5e14b6b72---jijizuvavofo.pdfIn PDF document text
    • https://turbooto.vn/upload/files/62722282081.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c69991ba64b---vetetudewoxadopepo.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/5051475765.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608539a99a412---49219032053.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/99794458075.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/93941881119.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f117bf14c1---sixogedokifiduwetotemu.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/65654498548.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/79801613645.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/6ba084ebe7799c62deda9d6a18b87bd3/87437987759.pdfIn PDF document text
    • https://xistenze.com/files/files/4121797294.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c905eab98a5---70421732800.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/76a7851de58c3e7c791bd8660f3d7b3e/11738464260.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/a98000cef3712ec7d169428f30913466/gutexefomidetumuwokapeno.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/xerimis.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a546beacfe---27881471467.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/20215488151034.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15f2d1f0c0---1914192158.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/b887ba67e6124a4a7f2c8535e74498c9/dunowexiwisipura.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/kitekune.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/6587405086.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=trance+movie+torrentPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/de12e05c96ee7f2f67e21a7608d9aa53/23537422262.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC3 10204 bytes
SHA-256: 0a36d030a2e05c380e5498e69e593e5e7b3781f5b9aa0873c57f312600b8265a
font_01_sfnt_off000106ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBE 17704 bytes
SHA-256: f18b38ef80e752b0e4c68c7afbcb03261028322e04ca5a9b5d387bc3ab25fae7
font_03_sfnt_off00014d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D16 16060 bytes
SHA-256: 8bfc5e2f6383778b4716e60c732a7e5228106b692ca52c1f6b3c0b2892049825