Malicious PDF — malware analysis report

Static analysis result for SHA-256 a839ee0fc3f725da…

MALICIOUS

PDF

83.5 KB Created: 2021-08-16 17:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d4ad6d79cda37673a434e1d0d9118f84 SHA-1: d5ae96b3e981456383b468920ad4cc665c705559 SHA-256: a839ee0fc3f725dac9c772270c7b84fc2585e2e465b0768e1510467752975368
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • 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.
  • 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://namhunglogistic.vn/site/files/38219739353.pdf In PDF document text
    • https://chezgregoire.fr/userfiles/47841598597.pdfIn PDF document text
    • http://terminsk.by/pics/files/83510500906.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/defixeragujusutim.pdfIn PDF document text
    • http://matkinhantai.com/luutru/files/miziluxikofidodinowak.pdfIn PDF document text
    • http://tumonjfk2020reunion.org/clients/f/fe/fe8b949e9fe7e5065ccade199761aacb/File/nadejaropugufagazufituxob.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///voluveriredutex.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cd06433c059---11015587024.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/9aelh74rcavoc1qorhgnanhfb0/64534497488.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608966d6eba3c---zovevum.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/piramivuxoti.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/50527262853.pdfIn PDF document text
    • https://t2sc.me/userfiles/72041024807.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b552d021b7---fuduxawolesibi.pdfIn PDF document text
    • http://proxima-design.cz/files/file/36438758880.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b99e321a824---nolotazabakonotifixume.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/fejudivegubifibafaxisuz.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/fekakalekaxe.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/fasubagobibekakur.pdfIn PDF document text
    • http://aptatravel.com/clients/4/48/489dad2d2d8436d4c085fc0ccdc2d1b3/File/79125978343.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/ranazu.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/c344aa43504600dfb2a9943cfd3940f8/56901972532.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/9b3cde27u8lnn77hdbmff3qt8n/19845257428.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/65cp1m0nobu11snqnisdjtq6kc/gulujexijexufube.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=rubik%27s+mirror+cube+solution+pdf+downloadPDF 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_off0000e170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE170 16732 bytes
SHA-256: 06f01291c04acd1f33cdacdafca3cba2368189308da08c4f9f3e82f01c4ca66c
font_01_sfnt_off00010c9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B6 11280 bytes
SHA-256: e300756448c9da4ef83c2254a60cbb7363a25094c0ea017ba93ecec5b1e533df

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