Malicious PDF — malware analysis report

Static analysis result for SHA-256 e559f6924c9a3d81…

MALICIOUS

PDF

85.0 KB Created: 2021-09-24 09:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 829d83311b538d0e11e3de0ed17c0c6e SHA-1: 58a58018c6a864e3fd565c302d2b9ed620ef76f2 SHA-256: e559f6924c9a3d81153b96336c095f400fd58125edbe1067efe6ce2de3c40b7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://cructi.ru/uplcv?utm_term=marathi+calligraphy+fonts+for+android PDF link annotation
    • http://avvocatoandreabruschi.it/userfiles/files/daror.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/kuxizabomadekoliguxo.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/jewuxetusu.pdfIn PDF document text
    • https://clove7.com/userfiles/file/bozetugekufuni.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/35064833658.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/53448510548.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/zonovolomokezimifumap.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/dbrr8atsfe7n7s7u5goe27cmh3/degemovonudorufi.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210923001037.pdfIn PDF document text
    • http://jngf.cn/files/file/tarugudodesuxejuzagoxet.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/kubasefiwejesulaxe.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/18330859389.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5c3e7a360---zatigojegab.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/kenab.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/16921321396.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/febubajupevusol.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/64752315783.pdfIn PDF document text
    • http://darstin.com/userfiles/files/pemaxovabuwobedolawume.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/36516086659.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/39314277314.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/48777016766.pdfIn PDF document text
    • https://kamionosnyelvlecke.hu/userfiles/file/90350890627.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/21522199054.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2d85caecb---22190143274.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_off0000e063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE063 20888 bytes
SHA-256: daf94857e16c96597dccad5dfdf33647783049d4b44fc9c7be6691276f9cdf1e
font_01_sfnt_off00011526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11526 10876 bytes
SHA-256: 7bd2aba5c2c88cfbe8375c533412a06636d9713b7fce9313f64d069cbd0f9d17
font_02_sfnt_off00012e10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1