Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8a6663255afe4ad…

MALICIOUS

PDF

104.9 KB Created: 2021-06-25 20:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b61e903bdc31dc83ee6d5a34e1d10615 SHA-1: 93af1f4db72b6aa7fef0839bec953f4bb224caa7 SHA-256: a8a6663255afe4adc355f246bf69043abb5a0fbc0dff2f7f5295630cd2764770
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content or phishing pages. The ML classifier strongly indicated maliciousness, and the structure aligns with link farm techniques used to distribute malware or facilitate phishing campaigns. No scripts were extracted, but the PDF structure itself is the primary vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9682

Heuristics 5

  • 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://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/i8r7jb7rfh90ddqkqnr38nbluq/88033879847.pdf In PDF document text
    • http://rdmsrl.it/userfiles/files/wanibatokedafifiwevipuf.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a687ea4e5da---64624771237.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06fbce1209---rabaduzofaveti.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb744f23a6e---rexodirojosagaferid.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160800c1fbd08a---temavuralasemowanokila.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/m6dum6telqhm930jj0bad1ilj4/sisumu.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/653565c8f70b92ac47a58184914cd142/jakokofo.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b076c9d24aa---153040337.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/32131236887.pdfIn PDF document text
    • http://hrudolf.com/userfiles/50460230290.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/16dd2e1d03e79e2a6a24c9e0e6681fa9/wimumerijiparoxegosukigoz.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/maboxemulop.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3bfb77b79---70709367818.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/b50bsmq7j9rq0akk189d77jjhh/mewagemokuxebemaxi.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609843122008d---78317587569.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd3dedec70---zevipukapofifa.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607847814fcb7---31499678049.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160712ffd477b8---46539283567.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/71319420153.pdfIn PDF document text
    • http://nappsa.org/userfiles/file/jefupovepujopizom.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/56299934233.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775bf71b7c8---guxamodajupofikijar.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/3a9609d13bbb93087dbd3a0c12b751cc/zoned.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210620135346011.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/05d00efc2dff4354832724dcd383c147/80793089102.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=the+force+per+meter+between+the+two+wiresPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000118b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000130c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C1 16168 bytes
SHA-256: 1cfb00680a8a18ef5d5af493cc5b57cfe410abeba37087ee2ecd799c98b61e68
font_02_sfnt_off0001465e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1465E 10724 bytes
SHA-256: 9a7a905a8e51a17c08b5871f85cb06470733d70e1d8b6eb6c7c02e24741f8db8
font_03_sfnt_off00015ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EAD 19956 bytes
SHA-256: 5cb0fb7b800883ff61759edce38f614dcb8bfe07fe6c4a8f0971765f98fd1a1c

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