Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b2f78cfe56f2754…

MALICIOUS

PDF

132.5 KB Created: 2021-08-02 16:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6beed3fa4678c1a4af28deb73387f384 SHA-1: 097c81f6463f66dcf7abb70a86c46e10dbd6160d SHA-256: 4b2f78cfe56f2754afc56f66505db768fd34f81ff5724325325a16b7f611e908
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of external links, many pointing to compromised websites or domains associated with link farms. The ML classifier strongly indicates maliciousness, and the link farm behavior suggests an attempt to manipulate search engine results or distribute malicious payloads. No scripts were extracted, but the PDF structure itself is used to host a large number of URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://barcelonamedicalcenter.com/files/galeria/files/masoxubewetanimolo.pdf In PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/b4b481d7a5f3773631c56c30d2868db6/70157382277.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/mibug.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6dbc188fa---misovakasemojatepamabune.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/zolasugebixomozebatotolot.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/b8f2kmqpninqucbupqhjmg777k/japewimuganesijowiv.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/99879249332.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/dj86gma7kgp3v52obc4doiej61/6582278859.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbec330ec80---27937204645.pdfIn PDF document text
    • https://hoongnau.com/upload/files/joxoxex.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2c9c3aa67---wekawipoze.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ede2353ae---faxujumutubazowif.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/gajezeguj.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/3ca9409c5fe6896e7c32da9b5e0cf11b/rajogune.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/ruvomege.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160738559c9f55---94717523465.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///38165668756.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/118f1d954e6ae78d3b4f4df404fee5b8/tofeduwutomof.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ad1f44310---25742345685.pdfIn PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/riduvidiri.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02f0eef950---wuzarujurip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=brett+y+daya+90+prometido+de+d%C3%ADazPDF 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_off00019fca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19FCA 10812 bytes
SHA-256: 4cd3337de85ecea12c3aad409f55883d85160565093aa468544c3e17c2ced97f
font_01_sfnt_off0001b8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B8C5 19048 bytes
SHA-256: e6b96af3bd805f1c46b4fc2852d67ffa728acb2715354dd34d3efc97d2598c7b
font_02_sfnt_off0001e97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E97C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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