Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb34489e5a059b36…

MALICIOUS

PDF

71.1 KB Created: 2021-09-03 16:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 885e4753e92e650d2af343976a93e536 SHA-1: 1ac35c36a5ff1c8950286678ddfb59171300d8fa SHA-256: eb34489e5a059b36d5c68c2e2527b811f753540468b9c8cac06c40c561cd477c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised websites or disposable hosting. This indicates an attempt to redirect the user to malicious content, likely for phishing or malware distribution. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://huntic.ru/uplcv?utm_term=amar+ujala+today+newspaper+pdf+download PDF link annotation
    • http://ministerium.pt/files/95860037177.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/dugegir.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607df8248b0ba---79391621772.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/66696091897.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/fuwudadosanuti.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/798cc4d9b68cab5257f88aee8179c4ab/14963317471.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f0841b236---tuvimidobagefuvex.pdfIn PDF document text
    • http://cmtsport.com/pliki/95967010370.pdfIn PDF document text
    • https://philcoastal.com/ckfinder/userfiles/files/99677753397.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/56671082725.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/dalujaluzezuzi.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/9061b8f742a7ae3f20726130ac6836f9/vejaxozomafod.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/psmv6bg4s10e773r23g0ccotva/25525727423.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/lawetitas.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/16da1c5d8e6d5081f2bcb57af6a95b15/69166778896.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a20d24d0cae---2809769304.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16078e23e1a633---rujowoponozi.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/88098198699.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021052410420736.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/88683434311.pdfIn PDF document text
    • http://donghotam.com/luutru/files/gititib.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/44512799844.pdfIn PDF document text
    • 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_off0000b387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB387 10976 bytes
SHA-256: c3cffa73160ef2758938479b13b5fa1c6cdd1e76796f97b492a4e81d7d499d8f
font_01_sfnt_off0000cd20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD20 16212 bytes
SHA-256: 93a83209dca1cb2c27eadba27dd53a562ac47033813ec6452380854e888f488f
font_02_sfnt_off0000f6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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