Malicious PDF — malware analysis report

Static analysis result for SHA-256 80eec80e12e949c7…

MALICIOUS

PDF

85.1 KB Created: 2021-07-22 03:23:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: eefdbe73eaab9beca559af88c2f8b323 SHA-1: d41d37fb40d6999437b032a4429916baa946ad15 SHA-256: 80eec80e12e949c7944cd4276633570285fc74ab85ed4131e269c7ecc66df294
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code or redirecting users. Several heuristics indicate the PDF is part of a link farm, with many external URIs pointing to compromised WordPress sites and potentially disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d655ab2d44---loxavuzurozaleb.pdf In PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4550316336.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/37385062268.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607822be6f0d8---pemijifevu.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c70dd71fa4---5199110357.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b886e5108bb---ruxeloroluzawafuburolig.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/dcd6c4ca2a11b2a54c4090698c743726/35779109947.pdfIn PDF document text
    • http://lhsclassof1971.com/clients/74120/File/82935221492.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c745d7b4c88---27496622243.pdfIn PDF document text
    • http://greaterdeliveranceministries1.com/clients/61527/File/31867233201.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/58867400394.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081482836078---sodagubetive.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608576149cbdc---95736058133.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/95846188624.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/mukutibefasikufizepo.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afb217c42d---29721705449.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/12244235525.pdfIn PDF document text
    • http://distributoram.com/files/file/gifena.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c1edb04d602---69312473922.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/c36db7bdd7d476d9f577200dade62fdc/40604774291.pdfIn PDF document text
    • https://luminex.pl/upload/file/35285184991.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/nipapugolewesasulikin.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/melanofad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=research+about+social+science+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_off0000e8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E3 11000 bytes
SHA-256: f1ecfb5e7fff0baf2aabdddac67b1d67154c2720dbc884d45520945322e232ca
font_01_sfnt_off0001022a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022A 17148 bytes
SHA-256: 454cb4b3605ab1023bdab5850f4c51c5ffdd03dac9bc7bdd2e1ed5d7e9620922
font_02_sfnt_off00012ef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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