Malicious PDF — malware analysis report

Static analysis result for SHA-256 411d6623adc9f649…

MALICIOUS

PDF

95.3 KB Created: 2021-08-20 15:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2b68d6730bff423771a9de72cd8a1920 SHA-1: a728d9d619b5c3d10a63562c8ec19f7a35e09703 SHA-256: 411d6623adc9f649b68c6e20d4e34e4f6ad617f3dd20dbdc4be5bd015855dc4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves luring users to these compromised sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://thestarbusan.com/FileData/ckfinder/files/20210803_CA78E528841EC25C.pdf In PDF document text
    • http://apcmagon.com/userfiles/87821453296.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077be7c75ae6---28424817549.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160959ad5011bb---69351224597.pdfIn PDF document text
    • http://starlightskiothon.ca/clients/4/44/44db284a3a4a6a3f34f8f2fa71918f98/File/tafumuropumovimesigej.pdfIn PDF document text
    • http://labotinnghia.com/img/files/kewizapurib.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b53274062f2510f3ccf5aadc78b77971/96842785045.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/cc79cbc6357963d702a559dc3e6c5897/gegodixepi.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b0ea08e28---1401385270.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/gariwuzixuwiri.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/tavunega.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/vejelikanokizeseniwakuso.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/95110772880.pdfIn PDF document text
    • http://remobudostol.pl/pliki/kunipazosesijetatutabizu.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/68737560364.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/69938789758.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b143c5a0b06---34665015789.pdfIn PDF document text
    • https://effetre.biz/file/suxilopepel.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/97b40931912936eaf2247ff8c4de7fb4/bapasifu.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/41789575458.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8de6046a3---56093119692.pdfIn PDF document text
    • http://nbpcpentecostalchurch.com/clients/65183/File/24295973012.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202107/file/77121911405.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071d589a1616---22644090875.pdfIn PDF document text
    • http://soundupgrade.nl/site/data/ws/files/36422084702.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=ark+xbox+one+tips+and+tricksPDF 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_off00011109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11109 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001291b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291B 17092 bytes
SHA-256: 087bcbb1a72efd22e13998e7966b2bafe04c451fbd48764f4ca5cd1fd1491138
font_02_sfnt_off000155d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155D3 10776 bytes
SHA-256: b04679e6b69109ed45a0dfb31d45e2a168f4ed99777e1b9982066e1f52e3d2ed

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