Malicious PDF — malware analysis report

Static analysis result for SHA-256 a79432b3ffed2e05…

MALICIOUS

PDF

79.7 KB Created: 2021-09-17 00:57:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2753c966a54450504343611ce156de5f SHA-1: 0a4a0677d3fdff4334660997c308eaa148390ead SHA-256: a79432b3ffed2e0518442fdfa94754734b8261223dd89b72a1b1427a01df1c1b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The file also hosts numerous links to external PDF files, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of embedded JavaScript indicates an attempt to exploit vulnerabilities or perform malicious actions directly from the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://thegioioto.store/upload/files/duxibedibipalibuzafixop.pdf In PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/c7iuhe8nnnqieee02ur9q4kg82/1106610088.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///98477932967.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/befezomov.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/72234022118.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/milutafulugobederizuku.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/ludidaxuwekixukofatada.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130920253ea7---81376451499.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/venumibukesorirezomavolo.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/80230451457.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/rumalerosadezamo.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/katinori.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/bizos.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/53401779178.pdfIn PDF document text
    • https://kiptep.ru/file/dogasuwivivemufimifitab.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/40305762796.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131225b395e4---88309027902.pdfIn PDF document text
    • http://efcosmetic.com/uploadfile/files/22650072679.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/25839160847.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/37304160641.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/66562862579.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/webonijijabizikutapirib.pdfIn PDF document text
    • https://pindimana.in/uploads/file/fapeweduwuseveka.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/pojijip.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/52940078373.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=does+samsung+have+imessagePDF 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_off0000d5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A8 10480 bytes
SHA-256: 70e0542dd5cbb7a274e0bcb8acb82f05f4e75500756f1e03e0a389e42d420486
font_01_sfnt_off0000ed46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED46 17060 bytes
SHA-256: 5a9db2fa0dbde70c7daa236d3a4297fba36bae9b56e7693bf85bc4deb1668545
font_02_sfnt_off0001195c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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