Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9ab6a9da36b02f9…

MALICIOUS

PDF

82.7 KB Created: 2021-09-20 03:28:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0fba9898b4c59a0057e397c9434acd2a SHA-1: d27d2aa8f570237720f9962607a4db0f419a0af7 SHA-256: f9ab6a9da36b02f9169c44836c094f34d9c398478afd3dadeba0c8433ac39e9e
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no further context on its specific intent beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://racecross.com/upload/edito_fckeditor/file/61423296343.pdf In PDF document text
    • http://koreabulk.net/userData/board/file/xumibetodeguzoresodasan.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/ziduwuzofikap.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ba4d9c7d9---xoresebonasoleluz.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/tipenagino.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145c2a1749e6---47748060106.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/e5461e8c676f1596a5b4d746fc85cd5a/sisupivi.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/74458962218.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/womejesesunatulowetibe.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/6a4752f7c2c7d635919c936d567e67be/degek.pdfIn PDF document text
    • https://majubesar.com/contents/files/fejadalarezix.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/rokigof.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141f6cda2718---32787013889.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/20090850189.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/2021914116227303.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/wisunudipebedusi.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd9357a3b4---95920475525.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/61931952511.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/vanekafupuvejulifixipiren.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/bulilelafot.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161356adfbc5af---toxataxopoda.pdfIn PDF document text
    • http://cutskytools.com/d/files/70283815671.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210920_F021ADCC482F0ED3.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/97910634489.pdfIn PDF document text
    • http://emploi.nat.tn/ckeditor/ckfinder/userfiles/files/memujupi.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/51334675061.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+remove+a+filter+on+snapchatPDF 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_off0000dcf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF6 10888 bytes
SHA-256: 8342377b3a0185456a97f7ac43375c5bc49eb296206f10c1558d6f77df02bf2e
font_01_sfnt_off0000f5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F4 17976 bytes
SHA-256: f3c4f096c4d4ecf9ef743bfd4c963725e266cc50f2a2cf735496d0c6cc0fb0b2
font_02_sfnt_off0001248c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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