Malicious PDF — malware analysis report

Static analysis result for SHA-256 2903469e799a7b3e…

MALICIOUS

PDF

87.3 KB Created: 2021-07-17 04:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e43b9a2e2bf5c2d375678c688ad1ca99 SHA-1: 160a98e2b3332e18f9b8dfb54df86c3a1c5924c9 SHA-256: 2903469e799a7b3e2b0105deaf0aa96abe8043e0c064cdf063d56f6d556e2127
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS upload storage and disposable hosting. The document body is unreadable, but the presence of numerous links suggests an attempt to redirect users to malicious sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://falconfam.com/ckfinder/userfiles/files/gegisuxexu.pdf In PDF document text
    • http://toyteepee.com/uploadfiles/file/21062402080779351335cpft.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/c8d485d804dfcb782c8b296014f3d66a/fujebata.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609baafe70e80---86076297365.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb7d2b2677---47844551130.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/pioormmueodtrv3ord9hvnqkr1/3416135919.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9ab34d1e0---4698345111.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad95cc92e8c---dinojujikerovisefajid.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083d6fd1f699---73588011441.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/48851173279.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/26071082796.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/fijabilubanabowo.pdfIn PDF document text
    • http://alanurturizm.com/rsm/files/majusoxakef.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607370d567f1a---18039673881.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16072f27ddfcc6---vewoperonopufunepu.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd5e7e4c421---kegivepunerojaleg.pdfIn PDF document text
    • http://iltorg.ru/upload/file/77769259293.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/ramik.pdfIn PDF document text
    • https://digicpictures.com/downloads/xabokurinifilazobawosuf.pdfIn PDF document text
    • http://edbiji.com/uploads/files/20210707033849_880354.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078392fdb122---sumakijeji.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/9e855e0210aeec1db60daa3c3dc1cee4/14314387302.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759c880a032---vezogililuxosama.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=healthy+oat+muffinsPDF 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_off0000f34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34B 16816 bytes
SHA-256: 504646b92c1011155181eb27efe4eee40f6a11a323c5980f9393d9b66edd4f83
font_01_sfnt_off00011ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBD 10584 bytes
SHA-256: 5a129a6aca9e387ce2b02565e38c74da6dbbaebc53bf9465435317ed550da1f6
font_02_sfnt_off000136b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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