Malicious PDF — malware analysis report

Static analysis result for SHA-256 241d8d52c41f1238…

MALICIOUS

PDF

70.9 KB Created: 2021-06-22 22:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 37120cd6c6ae422a8b68b8b855e7ee90 SHA-1: f5389fd1feb873974b69f56947fa71b3a2892798 SHA-256: 241d8d52c41f1238c8616a5efeb0c83f215ffa0bfa91ae220be9a0a6984c426d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm with numerous URLs pointing to various websites, many of which appear to be compromised. The document body is heavily obfuscated, but the presence of multiple PDF heuristics related to link farms and compromised CMS uploads, along with a critical ClamAV detection, strongly indicates a malicious intent. The primary goal appears to be redirecting users through these links, likely to phishing or malware distribution sites.

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://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/26acd9dce9250928b87ca51d6dfaedfc/jiradumejekez.pdf In PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b472287aa57---zonaxikepaxejibinuxo.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c248fd1970c---57438433264.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/37f179d077a8135a9f1e7fe9e5889df1/89937214569.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/10874876105.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/7dcb2629e308d5680b932136cecda99a/julatixojulusemubugebidik.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/2a031a862e0c8e4337d6c7d7de4e1e94/14694305904.pdfIn PDF document text
    • https://laps.pl/userfiles/file/55675387456.pdfIn PDF document text
    • https://0900107678.com/upload/file/95471294537.pdfIn PDF document text
    • http://m2m2design.com/userfiles/kinifudoteru.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/t9effujt11oeeqqgatghe5gcn1/debudebemela.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b386ac3116f---madenitaguluz.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/8f4ba0c6134eca42395c288d3148c81f/98780023229.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/86886570932.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/pepomemujinakiboxubu.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/09c7029e001e1fd7bd1295db838334f9/89340293762.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/fuvevaduxiwalotefa.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb0cf64c07---zatepoxered.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=calculus+the+easy+way+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4B 4984 bytes
SHA-256: b8760505743ba395ff6d7e1ee2d9393eac625e575c87641506c2da16c338810b
font_01_sfnt_off0000dd6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6C 10408 bytes
SHA-256: e53882de052b599b985e5b86af6a5398be1a515072620af1f4c5640cc439e2c9
font_02_sfnt_off000100bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BD 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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