Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f3dbbe029ac67d…

MALICIOUS

PDF

78.6 KB Created: 2021-10-04 21:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e526d06ee1d67e023ab11b54179cb682 SHA-1: 98b977766f9c1f5867d3f3b16a0afb1797fe66cb SHA-256: b8f3dbbe029ac67d2609f44a5c8bf11cfd70d713c909560df941b185b5069b9f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing sites or download further malicious content. The presence of embedded JavaScript suggests an attempt to execute code within the user's browser.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://nuklearmedizin-amro.de/userfiles/file/veriwewegexukanurod.pdf In PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/43533122296.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/92466463750.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/nijosibowefefedegamiki.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/46054128297.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/mepunegadilubimi.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/riwujoregijutenela.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16145010d03f65---63953551041.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/xeruwolurafafuzodimugizi.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/64550714451.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/88145496880.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/37040770907.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/dafidi.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/50834415593.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/89547452481.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc9d246a34---gotubus.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/vopidumoxuk.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/piwefopedu.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/20135480407.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/0d7add33fcbc3944f02881c4990b403b/puxipitolirizuxanebidek.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210913_06E662BC7539C1C7.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/zixesoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=pdfs+into+onePDF 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_off0000ce7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7F 10040 bytes
SHA-256: 3ed68500125c9ee538160abe6ada1ebff30ea0af345bfbb9877b23939481bd01
font_01_sfnt_off0000e4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E7 18668 bytes
SHA-256: 700d2eae0f44c88faeafa420212193c582fb8008f983ac2da7349aed130a648f
font_02_sfnt_off0001153d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.