Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e93e378af462176…

MALICIOUS

PDF

81.0 KB Created: 2021-09-17 08:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ed46c4c83c67898ec0e2ebd8d4a16644 SHA-1: e1cd07efe5974d23e4579d365c82fe1769b59123 SHA-256: 4e93e378af462176a82c9fb19464278e3d398cb5546f8d95a9e4de82e27a04a4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further payloads via the link farm. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://hoteldarim.ir/basefile/hoteldarimir/files/diborobufu.pdf In PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/59759702008.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140eaad64d95---netufilinarabugojixeguka.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/49833648289.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/zoxuperebam.pdfIn PDF document text
    • https://brianspradlin.com/userfiles/file/814413765.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/79524752592.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee59e85095---42267903070.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/38199937012.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1613add5d6c299---memunojojute.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/39490319822.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109040054112930.pdfIn PDF document text
    • http://ahknchem.com/upload/files/51365287152.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/61901578041.pdfIn PDF document text
    • https://kvizek.hu/ckfinder/userfiles/files/tusubamuwenezudizupuwapar.pdfIn PDF document text
    • http://asqcert.net/files/files/52655408423.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7757dd2f3---dexolivolutu.pdfIn PDF document text
    • http://grasslandtj.com/upload/files/58601356902.pdfIn PDF document text
    • http://palami.by/images/file/lifometomufuf.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/80766329097.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/86770668810.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/14310111575.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/12915329187.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=download+pes+11+apkPDF 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_off0000d78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78B 10328 bytes
SHA-256: 0c49ff55259c9f0b657f6effec5f5bb1634525e49bd06351efd02ac9c654adc8
font_01_sfnt_off0000ef0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0B 18280 bytes
SHA-256: 20c99e8529fb7c3793987837f2e526d4d731aa023bc8e3fd9dbf6bbf2141b99b
font_02_sfnt_off00011e76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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