Malicious PDF — malware analysis report

Static analysis result for SHA-256 c639f05ad7e0af4f…

MALICIOUS

PDF

69.2 KB Created: 2021-09-17 06:24:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1f7ff7492317984cf254d166d85463f1 SHA-1: 805f1f5b059fe2c83ec77e357847141bba73d258 SHA-256: c639f05ad7e0af4f4d50e0a7d726fbd94cd1a3c5ecf014a757e8e3ca87ebb18b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing trojan. It contains a link farm pointing to various external PDF files hosted on potentially compromised websites, suggesting a phishing or redirection scheme. The ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION heuristics strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://geoass.eu/userfiles/files/xikopokuxirosozajuwu.pdf In PDF document text
    • http://glovimex.com/uploads/ckfinder/files/37370276287.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/45618168649.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/tarepupi.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/48273687841.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/kosorofusakumirozasid.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jubofo.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/51561635606.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/sabazaju.pdfIn PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/forotenetuwalamobejobegaw.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/wodipunadesig.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210909_310FADA4A8F2804D.pdfIn PDF document text
    • https://serka.com/serka/upload/files/77639047418.pdfIn PDF document text
    • https://nsaimmigration.com/userfiles/file/jokanigugeguvuvizixa.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/13964356403.pdfIn PDF document text
    • http://trieuduong.com/images/Download/59486863638.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/deguvasadoxufarijesopalox.pdfIn PDF document text
    • https://cebrium.ssnn.ro/images/20335282692.pdfIn PDF document text
    • http://glassick.com/userfiles/file/4678011080.pdfIn PDF document text
    • https://immobiliareincentro.it/allegati/file/radorusager.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e714abb86---vawebomuniroxulikemijevin.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/fmeqq3rbaio870hv83bm814p97/zamipopezej.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161398bf88dce2---kapina.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/fuwoxizezibiwefedoxofex.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/653eb73393554137f897a403c37fbae2/62462571898.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=playing+games+gifPDF 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_off0000b2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCADA 14836 bytes
SHA-256: 8f29b01f4588cd2754432d72cf8aaa6b452b7d4643dff8f367c30af3cc03fc5a
font_02_sfnt_off0000f043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF043 10352 bytes
SHA-256: 71728f8e45c111878b920d255814b1b9d97e61b00fdfa783b7c333d3d3643cb1

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