Malicious PDF — malware analysis report

Static analysis result for SHA-256 a00e46e5864c8d6a…

MALICIOUS

PDF

93.6 KB Created: 2021-06-28 09:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a71e2e3b2b190cc3a5cde459fc9e913b SHA-1: 2837f9fb0d7d2a1ce7d8bc3e2ab6eb78718a941e SHA-256: a00e46e5864c8d6ae83a27d86018bd6468f9508503373eb7ded88715187e598e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a distribution or phishing campaign. The document body was unreadable, but the presence of numerous external links strongly implies an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a81f495ec76---47103699272.pdf In PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/mujojiponav.pdfIn PDF document text
    • http://rosswellbulldogs.com/clients/b/be/bee1e50a814ad4ba40998340b8964064/File/lorem.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/vusepiniwin.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c041397d9ed---dajatafalibudukedatote.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/de6538ae0d11145b251e4d274a46e562/tuxowapuxuroguwuka.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d83da103d22---78694390149.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ca7f01b54---xonas.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a62768659aa---vuzorusa.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d5e84dbfc---80167386115.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/kevujekamuzejarotufebanal.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cab4c1373---27447712635.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/82785812604.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/b17c1c049dedef11369439dd4d4456c6/28169031814.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/62602444257.pdfIn PDF document text
    • https://ckmusicdesign.nluserfiles/file/kexipafej.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/877185089ec21627a8d65d44fa9cce48/71917961927.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/dedadaxigogud.pdfIn PDF document text
    • https://raptiherbal.com/ckfinder/userfiles/files/29834844556.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/22444152a52a9c00b9dc68d79173de84/80406282533.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987edb8c513---3081819677.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/im61e0agceims5ol9s2afefl15/59755100888.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=mitosis+meiosis+crossword+puzzle+answersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E9 17116 bytes
SHA-256: dbabdde2e357b4cfe905ae0b4f74e887254ba6393a5266a75e88649d356685d4
font_02_sfnt_off0001358a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1358A 10912 bytes
SHA-256: e58140ef86fe6b9cf3c66758c90ecee9d2583f5732865e24ad3ec1b23fb43df1
font_03_sfnt_off00014ede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EDE 17380 bytes
SHA-256: 11b42313c41690230e53e76c17e907c75a6d7f30b547b97d67e532af9015f888

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