Malicious PDF — malware analysis report

Static analysis result for SHA-256 19c7436e90055718…

MALICIOUS

PDF

113.1 KB Created: 2021-09-04 09:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 05053fb8f8b8bc5e66c7833626e500b3 SHA-1: 6db761fcf71ff0ed734b7d34633f447afd4bc15a SHA-256: 19c7436e9005571847b8bba7a5bd5fb4e08e1291f4a579360c9aa7f3e6be7fd6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, including one pointing to a compromised WordPress upload storage, suggesting it functions as a link farm to redirect users to potentially malicious sites. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://pistant.ru/uplcv?utm_term=taylor+testimony+pdf PDF link annotation
    • http://kutscher-customs.de/gfx/userfiles/files/2178717790.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/kasodazoxedawox.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/tatenajesutuzijuga.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/30914670536.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160fe0fa0ae24e---11744835207.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/52158535259.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/raluvusonejamiku.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609238f50d8c5---kojepon.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/d1aae0113055f0bcbfd88e8818c68efd/55024412479.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/8daf10af69cd01e613b1f330b6f36aae/bekuratetolunepunokomib.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a207dbc7a8a---73743729035.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/62572813452.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/vofisul.pdfIn PDF document text
    • https://vpntraffic.com/upload/files/5035356424.pdfIn PDF document text
    • https://blugarden.eu/file/wivifidarinepedin.pdfIn PDF document text
    • http://altus.pl/userfiles/file/jukusedogima.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/vikilezutabosivek.pdfIn PDF document text
    • https://pcetravel.com/files/file/1807368913.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/16078656405.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/62167323608.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097f844e7807---69814605834.pdfIn PDF document text
    • http://arhometutor.com/userfiles/file/28431749900.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/medufasomafeves.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_off0001554d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1554D 18484 bytes
SHA-256: b87a96e9524f03a6fd0bc0538a2f98b4cea3db035736f0e625f28c93d2cfc964
font_01_sfnt_off000185b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185B7 10736 bytes
SHA-256: f6509c68e65a9e6bc72f1d55190146b1ba1232c32ffb26ef72bfb70f2c113e6f
font_02_sfnt_off00019e6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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