Malicious PDF — malware analysis report

Static analysis result for SHA-256 053a6a4e30a8b0cc…

MALICIOUS

PDF

84.4 KB Created: 2021-09-04 22:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 37db809d7b548948e85b8ea28f068494 SHA-1: ff053762b9636790d2257669dd9e241939446bf9 SHA-256: 053a6a4e30a8b0cc59c19a27bfd1f72cb7f03c5d6812d8fa2c381a37cfbc2eb7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites. This suggests the document is designed to lead users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

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 https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/35d7f15f71bad45d3e3d258caf161875/figefonolujeweba.pdf In PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613198037eb77---gugetegolafukojinasib.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/bosawututavizabogibo.pdfIn PDF document text
    • http://strandedtattoo.net/file/juxiga.pdfIn PDF document text
    • http://goref.ru/files/file/majibo.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/6rmnefj2novjgenq3prfp1g153/buzomakelukegivixaru.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/merulod.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078abb4be965---48423831766.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161247cc4f0942---10042388191.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/dofubizorob.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/11602288246.pdfIn PDF document text
    • http://simonide.org/userfiles/file/50912116371.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/f1cmv9js44r3unusp6hv1viq87/fuwoxozazobewiv.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/56b0f5b7f35afeab8627cb8c0a053d52/xudosekuzax.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/8ce108ead25fe8f94a9f1d811282265c/42895439552.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/884efab8285e51a366538858d68a132d/82978256717.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076af4c1ee34---tijafu.pdfIn PDF document text
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/wodaxiwajuvixefakiferi.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/66828917958.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/1406909679.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/lekob.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/06/file/202106160030467594.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/labapadabinefivotoware.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=electrostatics+jee+advanced+questions+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_off0000e1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA01 18624 bytes
SHA-256: df15800a771a41c68d6ec5d9a336821e96e6bbce0dd88e425999fa27e4e4b4ca
font_02_sfnt_off00012a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8C 11040 bytes
SHA-256: 21989f893ec0f1335b32711ff984ca9a83abb50e76a97dd48e6b304f9faba937

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