Malicious PDF — malware analysis report

Static analysis result for SHA-256 4237eb5f58752e11…

MALICIOUS

PDF

85.0 KB Created: 2021-09-01 08:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 81c7337901f69e8cf4f4154779d2a0bf SHA-1: e2003c71ecbcd81a71ee07f56d3d87e6559c331a SHA-256: 4237eb5f58752e11cec8ad5b95232c6e806ae3d808967bc42d0975dddc985332
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs further support the link farm and potential SEO manipulation for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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
  • 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://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947d05313bc---8049743216.pdf In PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607427030d440---19893005915.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/23059000940.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f24c08c852---41804187391.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/43768122335.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608564ce9ec54---ronowefurak.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a16fd526bfe---ximelelugidoti.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/gugutatasapozofajesap.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/fililadapawelesisitixadik.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/27083790083.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/9f613420d6bd52245bdc74652e04395c/40954814315.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/79031533150.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/53497769308.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/76818415320.pdfIn PDF document text
    • https://coevent.ru/upload/files/xijis.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/b8rqhrl344m2pba0bgo5a056m0/8639803775.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070f54c1d9c6---jexosixogur.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/369fd8c2b00553458d568a738bc31699/zezuni.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/f8bb16ae28b1c47ae75032acd0dcb9fb/xilafujep.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/34310801241.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9d001e5db---sikakak.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/12849727215.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/86ee00c27107fc223c3f797b8c943bcd/genuwazeleramizokugefuw.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/91269986860.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/13771101344.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/21588676805.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=qm+for+windows+free+downloadPDF 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_off0000ea65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA65 16680 bytes
SHA-256: 6109f20402c0974f08785e40dff94f5bdad7a6efbbb78ab94d5d3816e709771c
font_01_sfnt_off00011567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11567 10560 bytes
SHA-256: febb88f1e1417149e8fe58a8ec42f6f3e1d5945be4c134181f3a39eb47a2570f
font_02_sfnt_off00012d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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