Malicious PDF — malware analysis report

Static analysis result for SHA-256 89d8bf908854e682…

MALICIOUS

PDF

81.6 KB Created: 2021-09-08 22:36:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 42a4fadc4cb777361a70bd9e108b77cd SHA-1: adb3c3ec9a1b1f58c9c9f3f0f1108f0245cfe0d1 SHA-256: 89d8bf908854e68267d045f5ebde09c355c0fb449eb2045195012949ac6827d9
164 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing campaign. It contains a link farm pointing to compromised WordPress upload directories and disposable hosting, suggesting an attempt to lure users to malicious content. The embedded JavaScript stream further indicates potential for malicious actions, such as downloading secondary payloads or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/46f8369249d7a16ba37c193326ce27f9/71223576513.pdf In PDF document text
    • https://takipbizde.com/calisma2/files/uploads/bomuzavibafizekidu.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/gajojutewonidaviw.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/zitixaludilejopezasubeju.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/34593970139.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/33800964406.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/bupofivegilebaborat.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/43730872914.pdfIn PDF document text
    • https://havilahbuilders.com/userfiles/file/92785096703.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/zuvenenogixetom.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/norobodal.pdfIn PDF document text
    • http://twsl.mingann.info/upload/ckfinder_temp/files/20210904140120.pdfIn PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/xofizukarafusirasofe.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/15362086703.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/wupetax.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/18157733194.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303e308aae0---bikabarokerunom.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/riviwu.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/sijaxalesoxiliburitefajim.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/fixejukenowedewadivevuse.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/4ff0083e3007b565539d4c75c992b326/zivajakugatakakinuko.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/dipupemuboxedimej.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/rajategutedu.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/87402316395.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/rutejuzibogekikiwa.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16135b19ee5f30---63491918521.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=clive+cussler+sahara+pdfPDF 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_off0000d92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92D 10592 bytes
SHA-256: 17793faead2c3af30239ec98cf3ce1761c655e597573d7aa5a29be8e0bc07206
font_01_sfnt_off0000f180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF180 17920 bytes
SHA-256: 35ae6cd01eb26e28fd597547a807b5e093141c57948011e56c1758588714c07f
font_02_sfnt_off00012054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12054 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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