Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0fc0fcb9324838c…

MALICIOUS

PDF

84.4 KB Created: 2021-09-23 22:36:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a50075bc7bfd84546d911e9152ef7125 SHA-1: 609ee8f37135d988db094c17c7ccd39c8726e325 SHA-256: d0fc0fcb9324838cddb1f42c53d9a812de4ac37b3f6bf057b1ae0c966221e1a8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://chcial.ru/uplcv?utm_term=wind+and+the+willows+pdf PDF link annotation
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16149b57b1f1b6---vifufunuduf.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/kijaxovivavalude.pdfIn PDF document text
    • http://gr-chem.com/upload/files/bofojovepajipimazasav.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/42901624286.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/jabojuzazasojigiz.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/wuvuguzokanobojuvave.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/33547337477.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/17486662262.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/wipewirujolipig.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/lupodemazesoxoki.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/77891839701.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/21534693012.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132fe9d89965---tigofakejogenitubero.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/jewoborirusoxalatubon.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/nafop.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/2861201841.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/fetofebedor.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/34646131629.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/98259326810.pdfIn PDF document text
    • http://miass.realxenon.ru/uploads/files/40552528356.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/koromitapapapomoro.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/vegoru.pdfIn PDF document text
    • http://juncheng.tw/upload/files/82230692120.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/63002245314.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/78889d3cfd2ef98a51be0088d00e89ae/bijerazemajafufukogike.pdfIn PDF document text
    • https://teamcode.net/upload/files/retedujufuporixewotexede.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_off0000e18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99F 19500 bytes
SHA-256: cb6bc26f92d8e105efa4113ff6d051d3cb1465e525555bd5ebd5deb59cdbcebf
font_02_sfnt_off00012b6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6A 10576 bytes
SHA-256: 9a124d75162b5e3e0b916975ef8e5fefec343d28355694620fc781778ef0a3a4

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