Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6d967e0438c6fb2…

MALICIOUS

PDF

71.2 KB Created: 2021-09-06 23:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7b36e4d8f2260d35ecc95e052d588a33 SHA-1: e645032a8577502e6a3c76cc4fd793c9ee7b9ea0 SHA-256: e6d967e0438c6fb296bc680bb18482e5ca238185f8e60f282ed796c115e33e97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many hosted on compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure points to a malicious document delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://51-lq.com/userfiles/file///58401669587.pdf In PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/0bf8960b97ba3c4188a8ebc4ab00748b/12550438254.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084bbd3c90b0---66711414329.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/xexufejogosoxedamisuxawu.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/d5df878bc5b8b51bb60b13cc2ac6112e/92881146563.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/82605121679.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/83432324180.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///34677206717.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdbc9955225---22183555587.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/baxaguloj.pdfIn PDF document text
    • http://biosite.ru/images/news/file/55356240822.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/47751387638.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kenalatigoragisovefe.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/4828025879.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/12467903bfcb63cf9d07f59f9225014f/zopopamukunubefimudosuru.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160841089b08a0---8399069535.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace28408197---lobobed.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/zamunumowemesu.pdfIn PDF document text
    • http://atomleasing.ru/media/File/fanajiroperamumokir.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/3c84ab065b8b6cfed5fd2286a4fd5b05/15908773343.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/mizaladetajegivegafopo.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/77741604007.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/vupuwarenatabeve.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/jepukuwutadatujekaleti.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/58085360121.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/12535498258.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=crustaceans+characteristics+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_off0000b992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB992 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A4 14632 bytes
SHA-256: 46b98e153f81aa7a3b643449ea432dfd9f0011585efc81722d458ff2a48675b3
font_02_sfnt_off0000f62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62A 10684 bytes
SHA-256: d65e75681c59865e3243a1b7264815cfdd15855a1ae70efd0cfa6d088201d44b

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