Malicious PDF — malware analysis report

Static analysis result for SHA-256 bce5f4d1e9e69a5f…

MALICIOUS

PDF

69.8 KB Created: 2021-09-25 06:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d97e5aee18c19e0263d5d78d8213bb1d SHA-1: 06503e8b25509e36cc1c446ff560ba3b067a851e SHA-256: bce5f4d1e9e69a5fa19e33b427e074dd13dcffd86b18884f632b9a07ed4c1d92
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites. Several heuristics indicate that this PDF is part of a link farm, with many URLs pointing to compromised or disposable hosting. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://loonbedrijfschimmel.nl/userfiles/files/69370898032.pdf In PDF document text
    • http://twilaw.com/files/files/68860120280.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161432adcecb5b---zevivogejulalotojo.pdfIn PDF document text
    • http://esen-life.com/userfiles/file/47603137762.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/bonareregaruw.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/37455927024.pdfIn PDF document text
    • http://seasplendorpetro.com/userfiles/8467724477.pdfIn PDF document text
    • http://m2m2design.com/userfiles/98956758262.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/7a8b631d9d65833da157bff17b9852ad/55182290203.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/13761832541.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/37372562414.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/pubal.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613496e1c54ef---lezuxosujunenamijevumu.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/97114279889.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/42965466772.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/94606731851.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/96006398740.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/10818907068.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/setoberepifekibuto.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/24705293164.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16139f92ce5f5d---vunutu.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/tujawop.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210919_17B9C65D1D81730B.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/87621924560.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=appium+ios+scroll+to+elementPDF 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_off0000b1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1CA 15628 bytes
SHA-256: eef92340f71765cbefd1eac6a206dfec806b55170c1183e59e2a9c0752e45638
font_01_sfnt_off0000d980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD980 10452 bytes
SHA-256: 31345a2d8b4c6f539c8a02ba31d333e08c72da6f6a201ffa6a85f85d0a30cbf8
font_02_sfnt_off0000f141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF141 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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