Malicious PDF — malware analysis report

Static analysis result for SHA-256 58aa34f466feb582…

MALICIOUS

PDF

100.1 KB Created: 2021-06-23 12:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 23b2f17be2e503d452e5fef7688fd0b6 SHA-1: 8b534dcb68f033ffc2f85155372ab6d2594c70c7 SHA-256: 58aa34f466feb5827ae309d3b8bc14840c4c0a6cef37b9c74992137ee2158168
156 Risk Score

Malware Insights

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

The PDF contains numerous URLs pointing to compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users into downloading further malware or engaging in phishing activities. The presence of multiple distinct hosts and the nature of the URLs suggest a coordinated effort to distribute malicious content.

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://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/621b597fd15eab59a8cc1a423908be96/bakaxuz.pdf In PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1660db4e70---75337230946.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/juseritewijofemiv.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/ci62fa24ei0s1smksj0h65ao85/2070944979.pdfIn PDF document text
    • https://ka-base.no/images_content/file/fukunedowegupin.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/8e31447549769c486d0ac79bdcd2e0b5/fokusikeboz.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ca2f5963f---vipapepe.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/391ec033d5743fc86cd6f62df13098f1/lepejopejidazagi.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/zufepasupuro.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ovev9m4hi61t0jodprjc4294l1/zadalopubewewol.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/movodudi.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083bc704f726---86120824920.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/da0c2dfceaac1107a7ad0a3961c39aa7/62242412610.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/59614355340.pdfIn PDF document text
    • http://rld-carbon.ru/file/fiwogipemu.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/28i25dlvpdumn1sbu5gtff7823/wijutefefozefulijefefozib.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/89n4q7k2rnuv7idvgl2kepg9el/wibiramodibisuzibito.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=el+maestro+de+las+emociones+pdf+gratisPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000143b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143B6 5432 bytes
SHA-256: 9fb367d89477750f0ef586185da0ec2a81c24408ee216df54d8113239e422490
font_01_sfnt_off00015618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15618 13400 bytes
SHA-256: 7a98fa355d805bced6b0d988e83050ddbfbe4eab8c7b376e1f3124d0bccffe0d