Malicious PDF — malware analysis report

Static analysis result for SHA-256 bad467376a4e738c…

MALICIOUS

PDF

79.3 KB Created: 2021-08-08 14:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 06a03f05e613ecb0f543a07c90bfb4b6 SHA-1: ae52e2cd9e8f5196d36e05e3f4893892f99525a2 SHA-256: bad467376a4e738c3da42da832ed35360d263920c0dd41b3879c97e441804111
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple compromised upload paths suggests a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://honda-otolongan.com/upload/files/nusisokebifawaguxewo.pdf In PDF document text
    • http://gabortech.com/admin/file/71223269205.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/26019660764.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/vukopusujomonabod.pdfIn PDF document text
    • http://faxik.ru/ckfinder/userfiles/files/tavumogotiranijobusuxe.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/f89steg22s71ocmtd0ikps968m/timizinomiwamo.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/52303108489.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cc3cb25e528---57705326481.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a109547de7b---32916931511.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccd7580d0e---91597788647.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/mekeojf87vmrfkcj79n9n07jg5/76357633444.pdfIn PDF document text
    • http://mcutech.net/upload/2021/07/file/1625627505978796489.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/8f661a6a51a5a9d8158ce9ad309928a1/texogogugumufun.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/086ba33994ac5802b50d321725818ad6/22826881511.pdfIn PDF document text
    • http://wonikqnc.com/upload/editor/file/1624031329.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/1f1fb3fee123b10f28975f1a6974efa4/6132319487.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/96770720169.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0860e1d44---fapufuxemitagegiwemew.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/48581202730.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734dcdcf5a5---puvilugik.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608170bba2732---wegagifaniveteporijen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=le%C3%A7on+le+cercle+cm1PDF 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_off0000d251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD251 18028 bytes
SHA-256: 2703848e3c8c9621bc3f1aa3f79ec76516d654cf9f9056892f3db58b8d9e6052
font_01_sfnt_off0000ff7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7D 10080 bytes
SHA-256: 1ec2c74577573bed3d3ba4cc05b85457f00b816262a44721d5ca2380c25ed416
font_02_sfnt_off0001159a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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