Malicious PDF — malware analysis report

Static analysis result for SHA-256 3973b04d2fcd455d…

MALICIOUS

PDF

79.5 KB Created: 2021-08-23 17:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e2a5ca0cf598c91861ed14079140dc75 SHA-1: 17ef2553009083980bd3299fe04c6e39df52a0a0 SHA-256: 3973b04d2fcd455d82bd304db69a39199a484c495c6a8dff375e3056a47672ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the link farm and the detection as a trojan indicate a likely intent to deliver a secondary payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://askisan.com/upload/ckfinder/files/xupaxeguzuxixi.pdf In PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8932f13da27e8541371a20c8e2a778a4/pawezigofodit.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/30602643193.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/40974559945.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e84f9205e29---85073652328.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021080611460773499.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/rekegutorod.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/14008913126.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/95903634386.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/datadaxapitanesika.pdfIn PDF document text
    • http://suncreekpuppies.com/clients/8/88/88daaab1104cc9784d9cd8b59d189b35/File/gigimosazogote.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86ed4c6565---439596234.pdfIn PDF document text
    • https://lncl.org/ckfinder/userfiles/files/xekikigevup.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/nudarogavanefotugene.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/vorinitaborevup.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/306dd8c74c8f35e355aee3253da7de2f/23172694012.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/24779241583.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/n74cbbcf0ackmso5cuqgh9thrn/47685003448.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/39091073994.pdfIn PDF document text
    • https://soechi.net/userfiles/file/60931044030.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/vunakogigonomu.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09e8ae4d50---dezigez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=discrete+and+continuous+definitionPDF 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_off0000d519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD519 16588 bytes
SHA-256: 3ce7b740e63fc814ca0ad53aab17030b7bd5d2f5c0efbdfb884ca64e86660de4
font_01_sfnt_off0001001f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11836 10524 bytes
SHA-256: ad405b0062f5d274516032a218c9372758da896202ec11ec88a18e1ecf366094

Open this report in the interactive analyzer, or submit your own file for analysis.