Malicious PDF — malware analysis report

Static analysis result for SHA-256 db5a8717a8f695f8…

MALICIOUS

PDF

87.4 KB Created: 2021-09-20 10:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d48d30495663ea3eced6f20169f822f2 SHA-1: 517bb8fe6317c2e1a93b071e71909434996e9728 SHA-256: db5a8717a8f695f830c32cfc2614a4d125382025c0c22354efd07e7613af2018
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm or phishing campaign. The presence of embedded JavaScript indicates potential for malicious actions within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=wifi+password+connect+app PDF link annotation
    • https://mediaget.ru/userfiles/files/vupamatamekidasoputiv.pdfIn PDF document text
    • http://hig-hegmann.de/userfiles/file/kunapanokakomigalasewa.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/74610803090.pdfIn PDF document text
    • https://panelshock.com/userfiles/file/34505781648.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/weneliwijolumobijaroz.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/90085545648.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/gides.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/mexama.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/46664287554.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/maperulupipezigizaxir.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/kubep.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/97446365613654b991f0a.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16135dc35ca37d---mipetevijururusotusok.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/segaxojuvunojexu.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1631008686.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/41402904748.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/puruzoji.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/mamesufojo.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16131fe69eb2d6---fiwetujebodemusuta.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/03/file/20210903_073015_159.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613259473dbe6---15453124351.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/29415540056.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/xurawesu.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16136a33419ae8---51564101744.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/fisokad.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_off0000ee32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10649 10648 bytes
SHA-256: fe9f6676896e8f354eaa24c2b4fe3e48162ec12415b86dcf3f7e55761b3edbe1
font_02_sfnt_off00011edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDD 18936 bytes
SHA-256: 01deea74c0810ba1a73d4b114fb6c43eca1cc4dae3bc00701b30a6d8b6725e37

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