Malicious PDF — malware analysis report

Static analysis result for SHA-256 c29d239fababc199…

MALICIOUS

PDF

67.9 KB Created: 2021-09-15 16:09:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 04a1a65271113f591bc9f74ee5c463eb SHA-1: c9deda662850728ebeb799d96b3fa062e7eaf6d6 SHA-256: c29d239fababc19997b4b6969ceaa401cc23d50edd0085016c56dfc087e73a4f
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The presence of JavaScript suggests an attempt to execute malicious code, likely to download further payloads. The link farm, disguised with a search term for 'among us android free download', is a common lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • 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://gogift-it.com/userfiles/files/faguvesos.pdf In PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/oo6abaf35oe0nlfon4csu6s9o4/87494634605.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/10143689087.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/rodipejepanisekimoke.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/46527454032.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/161386eb529f0f---44837022528.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea44a4960c---rejamilinomelesapafolu.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/61028432369.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/91848753575.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0784573af---wufopu.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/kebesizivavalubas.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210906135450.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/14628697370.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/88354209929.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/jowadupizitizopuwonefe.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/d92d64a02efa0e389d89d10bd3e0a35a/65161317443.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/kowoxi.pdfIn PDF document text
    • http://keitbg.com/images/files/36410399330.pdfIn PDF document text
    • http://orem.mn/uploads/files/rikotolizoji.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/91904954248.pdfIn PDF document text
    • https://eetravel.net/file/dujibujazetob.pdfIn PDF document text
    • http://belstroyiz.ru/img/file/zasikenujafewopulisurud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=among+us+android+free+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_off0000ae70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC682 14144 bytes
SHA-256: e957dd2b9656aa382b2d520621a893eaa1ad6bff412d178d7bb5aaf2cd143fca
font_02_sfnt_off0000e9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CF 10764 bytes
SHA-256: 9811091bb34adbe4eb579faf46d4bce1392093f51cdd2e53c1970c3f9aec029c