Malicious PDF — malware analysis report

Static analysis result for SHA-256 4010d20c0561e31b…

MALICIOUS

PDF

84.2 KB Created: 2021-09-11 17:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a2a82b57b8af9ada6b4c36078d07fbb7 SHA-1: b6d8137b9a38746407ecbcc9eaf7d2d809890555 SHA-256: 4010d20c0561e31bc87f3ac9146aa94af78c0a052be46b97e5d52a08fb4ed33b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics, including ML classification and ClamAV detection. It contains an embedded JavaScript stream and functions as a link farm, with many URLs pointing to compromised WordPress upload directories. This suggests an attempt to lure users into clicking malicious links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://kebecelectrique.com/upload/editor/file/31443303558.pdf In PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/74060784020.pdfIn PDF document text
    • http://parilka.by/var/upload/file/nolomotiwabaxu.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/65621384519.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/wizafiwupo.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/84419452314.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/tosujefile.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306d42a952c---29511620152.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/wakuvojafod.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/fomilulebutepaba.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/wimukakimujelok.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/67779262450.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c19d924e34---14931813958.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/39824662476.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/89956425662.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///51134845821.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44583068077.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/93013833361.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/ruludefuzen.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/xusus.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/gezimamulogebixiruvukagi.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/1b306ab9e01b847fb2436e42796cdd39/duzikofixufojabuju.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/3bc9ec67edc6a3535a1d2934b6d868dd/dizovanuzigodewururowo.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/3049585c340bc0f8c55965d3c3d90cb1/18429246017.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/98440657120.pdfIn PDF document text
    • http://clingac.es/d/files/gafofefutukupi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=best+survival+phone+gamesPDF link annotation
    • 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_off0000e537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE537 10920 bytes
SHA-256: 0b06d6c3384c8d0efcabe17a5e13df7634c35f8fbee22cc49b515c703adf27c7
font_01_sfnt_off0000fe5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001166d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166D 17288 bytes
SHA-256: 4b351c9dfd2cb6c8334bbc280dc8920f17536da9098ec097535333d2d1141d9f