Malicious PDF — malware analysis report

Static analysis result for SHA-256 e50a2db9969cb63c…

MALICIOUS

PDF

74.9 KB Created: 2021-09-17 23:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3503afe2fd58f67a5f21d7f680ffb800 SHA-1: 5fc68a79a53da0d4b27a6240318acad4c628846e SHA-256: e50a2db9969cb63c1be29c8304df1432088d3442ed1d70a1fd6a0a52f4969690
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many distinct hosts and URLs, some pointing to compromised CMS uploads. The primary purpose appears to be directing users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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 https://hsse.hssanesteban.cl/files/56224482720.pdf In PDF document text
    • http://mopron.ru/upload/files/vojat.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136dc4bb7b89---wunavaragibeti.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/9008407249.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/161377e2983806---jumaziziposidupanuj.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/tabitaxotapugezugotox.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/90416356297.pdfIn PDF document text
    • https://guijek.com/userfiles/file/nugijebekamap.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6d4df13e2---98034788224.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7f94a8f15---99396609385.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612f333d5ea0c---87288429241.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/08aaa106b715f2c4ea27d30faf9ffbad/26122292458.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/31693761141.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/9q50g3igd5estv39aml66str60/33218894567.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/38319347897.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/21559797499.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/vakasexa.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/jaruxejizidadapejoxataden.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/fiwilofakufanudefinupa.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/26369051873.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/24243659785.pdfIn PDF document text
    • http://internet-trade.cz/UserFiles/file/15138700903.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210907065540.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210911_202253.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/fadolatefetaguvun.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/tijiwenen.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141230d03741---6108394879.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=plexus+henry+miller+pdfPDF 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_off0000c236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC236 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA48 17284 bytes
SHA-256: 0b544a6bb6391c6dd4161b84c570fc1304dd88fa7fd6b18908e41e09748d6dca
font_02_sfnt_off0001054d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054D 10700 bytes
SHA-256: 57b557796a6f2ef2a05eeb619ef5a326e4ac6a669f818e390dde8247e46268de