Malicious PDF — malware analysis report

Static analysis result for SHA-256 58a0b2285904f1a3…

MALICIOUS

PDF

73.5 KB Created: 2021-06-06 04:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93bc9b87c4e9d4502df960a02ffe4b1e SHA-1: 9feef783ea33f7d594bb639c7d3e3622fe2517f3 SHA-256: 58a0b2285904f1a3a08b2aff7f8630a5675d89b514eac192469a5ed947ef79d7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://chcial.ru/uplcv?utm_term=exemplos+de+frases+periodo+simples+e+composto
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/imnc4bv9tp43b4rp089v8k3hi2/vokojigelezolupezujawex.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/c464ac3734dafb958e99f2145c685b98/samojikobofu.pdf
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/4898d83077f487f28e040af8895b1cfd/zozemarisalokibema.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/d7ffbd5992247735af179a25c15f5db5/94862097786.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc63939c90---28238986614.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608162fbda080---91011852506.pdf
    • https://zegabilisim.com/calisma2/files/uploads/mavaviroxenajowar.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160733e0bda617---vapakuwitatuviwovubatu.pdf
    • https://damiel.eu/userfiles/file/kudajiwodibibaf.pdf
    • http://goldartline.ua/userfiles/file/79350157815.pdf
    • http://odessahighschool1970.com/clients/7/70/70263b1be1b93b62200e198143f59f20/File/34072599532.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160885395782c2---15659704550.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58ea252296---xizawudetugujubivixuroma.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d282.bin
001ff060a21c85765a8ba3da6843a053d77dcc956c814d70d67e574f22b79e2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD282 5008 bytes
font_01_sfnt_off0000e393.bin
37e0355bea495d96dac79d844ef5eee27dfd475267b1fa9abdaa26b6ab148202		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE393 12368 bytes
font_02_sfnt_off00010954.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10954 4324 bytes

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