Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8c258d47c8ef0fd…

MALICIOUS

PDF

73.3 KB Created: 2021-06-17 13:23:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 40923afbb845f6870ad7b3f7692ee378 SHA-1: fc171ec5a22fe53c162975932bc756f9c207a2ca SHA-256: f8c258d47c8ef0fdaf47808c7334e920b00c2f716edfa7d5e61420a922f6523d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is classified as malicious, exhibiting characteristics of a phishing lure. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to distribute further malicious content or redirect users to phishing sites. The presence of multiple external URIs and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=mario+let+me+love+you+mp3+free+download PDF link annotation
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858eed8c10a---8924642358.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/61faf49e3e1ffc4657a7da790bf48061/37231715262.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/35878479775.pdfIn PDF document text
    • https://kis-u.com/page_data/file/20210528030207.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bdb40ee51---sajovelojiduruzutola.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/65172bd232d449a152325c3559cbb660/luvakukanopalaramutokuguj.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/0hf8kcujvsn9rpu5hktg6bl3j7/zunaxixesufesarasim.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/17107276223.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca5ff3acc5---27800483670.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1f5c9c433---71775318856.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/xorugatanim.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1279dfabb---xexanomuwobixolutigov.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f297db60bd---jipemutenerijadakunidi.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/kjjronaqfvhs75eh3laidug4tm/furudugubapinemalimuk.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ade17fcc5---30155435287.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/jivamade.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/rawujomiwole.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE152 5432 bytes
SHA-256: d9d233c3c8b99bf66d940f2a8d91896c229ae6ee8c89ec4e4dc61cdd0ca96c4b
font_01_sfnt_off0000f3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E5 10936 bytes
SHA-256: 717ac0a563c8830c6f2d2de1544952109e9ea3ca71628e530e11354d857fffbe