Malicious PDF — malware analysis report

Static analysis result for SHA-256 43e0c4786b45d37a…

MALICIOUS

PDF

81.6 KB Created: 2021-08-03 20:44:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 66f02c59e4a3e32cf5d346901df738ca SHA-1: ef7b9a47d102d298878cf8ffdc9d5a0cab254395 SHA-256: 43e0c4786b45d37a7426a01f292e015a6cd50800f68cd6167f076582ffc6821b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8728

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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 http://szermgrt.hu/uploads/ckfinder/userfiles/files/teposigesenenabubosebisa.pdf In PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/u80gdd2mg0obah3r5mmiircumv/29986985985.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/gudipi.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/a073a61639f5b00421e962fc584ffc00/samilajefirudobumakop.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/2bb640368640bae35130136e4d52983c/92496230631.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/9gnlfec6gh91ff5ckr0ds76ulh/57813035709.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/pokuruxapudeku.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16082b52c13851---96110313917.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/6390cb2b88453f26e644db6dec2e7e9b/68605749949.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/duxazodaletapevidokavoxi.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/93061091920.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/75939981e80ed176318892707a5f8a2d/taxeno.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/8sacumd154tc1o2g9srkfrn6n5/42299652619.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/e4e1f7037d19579c3f1d1e9374981ace/damuzewisivonuwulab.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3c6bc522e---rutuloxaj.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cfce01ef4fa---45026138675.pdfIn PDF document text
    • https://shidoremicrosys.com/media/48308180475.pdfIn PDF document text
    • https://medius.sk/userfiles/file/15346627022.pdfIn PDF document text
    • https://ckmandarin.com/uploads/memazavodolifudebidiwewaf.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b3e023020---44341648808.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608508d90d5f8---rezazuwo.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/93248766118.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/tipubiburotudisimepape.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=bohemian+rhapsody+notes+piano+pdfPDF link annotation
    • 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_off0000e535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE535 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD47 17072 bytes
SHA-256: 1f86be63569788d6fd57f1f225ec7614047b241e8b89803e267f25230b95c29f
font_02_sfnt_off000129c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C0 10884 bytes
SHA-256: 5fdafc835cecd9aaeee677e0fb12456c71e0b9e0fcdf7c17ff749698c6f28817