Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b85d38679a15c7b…

MALICIOUS

PDF

80.5 KB Created: 2021-09-05 23:18:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b94d3e162131d01564bf9854d812e316 SHA-1: d0287b86f954f802208272589c4cfc95a4f56d5a SHA-256: 0b85d38679a15c7b4967627c28c91cd3cb3e5087c2b9bb21fa76e3e18b554cb3
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to compromised WordPress sites, likely to distribute further malware or conduct phishing attacks. The presence of multiple external URIs and a link farm structure suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a52d13af42b---53388232196.pdf In PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/ea34ngpiq4832299n9ptmrp8v1/fijupozuke.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/vidadomegi.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/lps2p1vjiolcc2u6lrnf4ugfg7/17399104770.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/50a1c6d3a189810c5cb90f141bd25cd5/51531499357.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160912d41a2c1c---86956985506.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1f2a06550---4469634718.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb80c39cd5d---22725248946.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/86497783258.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/wefesuxefaxawune.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/51129235202.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cadfac47d29---geregor.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/08f1f11f4a98c5154c4c1a11ca96a8d9/sugozonetagavigakoz.pdfIn PDF document text
    • http://gdaniec.com/upload/files/neseretilafob.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/jimetekux.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/03cce30ed60812b7173e1930ebeac211/zugakidoriwemado.pdfIn PDF document text
    • https://all-new-wow.com/upload/files/xikikide.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/88729947436.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/lupevugikaj.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611bdc6a71f9b---80290900560.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b016d97ea5---75152533840.pdfIn PDF document text
    • http://beliangka.com/contents//files/gonaw.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081daac3d428---66305346291.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/bd9d21d53d0c2fb5ccf9e081e1c48c8d/toxerej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=family+life+cycle+worksheet+answersPDF 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_off0000d4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D4 10868 bytes
SHA-256: e652cda1f7e0de60841c1a7fb3edde73c6e070f017817fd75aa277de277d5637
font_01_sfnt_off0000edd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD1 17728 bytes
SHA-256: 1f5b364ab82a376226de23be4c7d1cd96c5e8525c2d1d10fa61fc3f141618076
font_02_sfnt_off00011ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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