Malicious PDF — malware analysis report

Static analysis result for SHA-256 571eba5a9a6b328d…

MALICIOUS

PDF

73.6 KB Created: 2021-09-15 17:58:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 84d1d4bd90cab42af0fffb4403f9afa0 SHA-1: 1db9fe42ecb802a251bd06e33593f665214f3be1 SHA-256: 571eba5a9a6b328d48793877a43b9b7ecdaf2e8d5aaf35c77c83658ef0d85874
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farm heuristics indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://queure.ru/uplcv?utm_term=how+to+send+facetime+link+to+android PDF link annotation
    • https://henseltech.cz/userfiles/file/tiverakigujuxofok.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/rejofodo.pdfIn PDF document text
    • https://aksusu.com/upload/files/rupuzexalake.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/10536000250.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/losawupi.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/bobiwakemudiliz.pdfIn PDF document text
    • http://ty-int.com/files/files/51712396320.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/84281399812.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/gubukoguwefomefunosus.pdfIn PDF document text
    • http://siamintertrade.com/file_media/file_image/file/gixebexapaponogalatex.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/17447083326.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/86299207586.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161322415efef9---joniwudisubilowebadenuja.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/tipebedibuza.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/lifikipidogugerete.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/8597813993.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/25711393412.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/2618408256.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141316f903a1---16954058322.pdfIn PDF document text
    • http://tamphuhiep.com/Images_upload/files/jofakuludusexabujujix.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/b31b401f9a83c028ff312631750f9c72/pekanagamalewove.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/87246907804.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/jibamanubiramotafin.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/piwenij.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/wuturesogamidukimafesosi.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_off0000bc16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC16 10808 bytes
SHA-256: 710f8fc0cd6b68b8ee6cae5f4423a67e0ead63bf4d425e5ace7a86f4721c285b
font_01_sfnt_off0000d500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD500 17084 bytes
SHA-256: 8a0271f8cf7b7871e87c12c7498e7f84100b88a1b9c7378388c268eeb23ba59c
font_02_sfnt_off000100ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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