Malicious PDF — malware analysis report

Static analysis result for SHA-256 39b01e81a45a9c64…

MALICIOUS

PDF

82.2 KB Created: 2021-09-03 15:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 03f59893606d9450739a1fd5eb5ab281 SHA-1: 5b87e83a9599aae5b66ce53ed8275c1378b20a33 SHA-256: 39b01e81a45a9c64eb06ff1ce6876c60c35e22be9df2153d835b56002850620c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and link farm indicators strongly supports a phishing or malware delivery attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://inwebjor.ru/uplcv?utm_term=bendix+duomatic+washing+machine+manual PDF link annotation
    • https://sarenpinler.com/calisma2/files/uploads/68631597881.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/612e4b8191c42d275d1d5e01b791cd61/69322768591.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/tipumumixavidojopuxat.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/92437019484.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdcd8cef99---didazebalazisazefoki.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/48519773525.pdfIn PDF document text
    • http://www.polni.si/Images/files/luvugofunumufibin.pdfIn PDF document text
    • https://ahha.az/userfiles/file/58910004657.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210803_AA150A1F3847C81D.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/biparusofitezajezowejew.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/89247702302.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a46a5b8e36b---kagosetodalikumoma.pdfIn PDF document text
    • https://spark-care.com/userfiles/file/finimasep.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611d72239dc6d---85706593371.pdfIn PDF document text
    • http://euro-ex.net/images/blog//file/21750832724.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a600b4c690---rogovofubejanifivaku.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/winovebuzelavepajipora.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/65739860826.pdfIn PDF document text
    • http://webursitet.org/Files/file/dixumozojafevuzive.pdfIn PDF document text
    • http://vilniausgreziniai.lt/userfiles/file/zatapo.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160740510a544b---wugaxawefiriwol.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-8-28/20210828011030382920.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/refupagosav.pdfIn PDF document text
    • 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_off0000dc15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42C 11056 bytes
SHA-256: 49be6dd2fde406f8ed16a7b5b7db61ef3bd5610047af4c45e3609431449972cf
font_02_sfnt_off00010da0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA0 17960 bytes
SHA-256: 70f2dfb8593a677a9717314aa4c694f335216aa0784d232825d7c2a4e9e0a959

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