Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb0db23594eaf316…

MALICIOUS

PDF

70.2 KB Created: 2021-09-12 20:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 10e1cf545b8b3b42d283480c2833a354 SHA-1: 8a5fa6d4ff0c040e16d2aa326127fbf3ecd2af85 SHA-256: cb0db23594eaf316ac65b0608212c6cb8c31893222dbd4cd98eac9b459038389
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains embedded JavaScript and numerous URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The URLs and the overall structure indicate a phishing or malware distribution attempt, likely disguised as a legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 7

  • 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.
  • 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://huntic.ru/uplcv?utm_term=update+my+app+on+play+store PDF link annotation
    • http://bnblspecialities.com/userfiles/files/14923280863.pdfIn PDF document text
    • http://cbafjvn.com/uploads/userfiles/file/85134153410.pdfIn PDF document text
    • https://dptech.vn/uploads/files/48956140792.pdfIn PDF document text
    • https://pixel.bg/img/file/sunetujov.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/2021913127217523.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be5d557623---lizulamoxi.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/gexusezusurana.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3d065c064---16089140371.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/45828555821.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/16726099430.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26872620201.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/xeburibuxajuf.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/87663852347.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613246f45b155---43165280142.pdfIn PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/3115620485.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/40795439361.pdfIn PDF document text
    • http://npas.ru/pic/file/1229060419.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/gikedow.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/wuvowasizuvivez.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/walibulovoduzipom.pdfIn PDF document text
    • https://sthouseluxury.com/upload/files/45946947799.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a81957d746---banogudaxewowigusowovisi.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/xixasezilixovufabepodafa.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/bofudofezevofigafinuri.pdfIn PDF document text
    • http://minhnguyenvn.com/uploads/userfiles/file/34289951978.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/71912303958.pdfIn PDF document text
    • http://stfurnimart.com/file_media/file_image/file/fubegavituvatilo.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_off0000b5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E4 15044 bytes
SHA-256: 524735d31909c94e521d1dc84f576426f68a16fa609b9a29c9f0d7f353d0423b
font_01_sfnt_off0000db53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB53 10580 bytes
SHA-256: c36cf75aa376af6463728b9fc16e91af5a2ff3cca4d624964b99731097fb3b3d
font_02_sfnt_off0000f380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF380 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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