Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae385f94acdf38d1…

MALICIOUS

PDF

89.3 KB Created: 2021-08-15 03:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b5ceb4aab744fb7cd3116a3aa8997f1b SHA-1: 6bdc956a28e1a501526ae7c5f1ee14874c2174d5 SHA-256: ae385f94acdf38d111abb21c9d2950e14758f5bede9c275d5ca95861d87271bf
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to potentially compromised websites, including WordPress upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting an attempt to obscure the true malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://baggiez.net/userfiles/file/25475202460.pdf In PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607caaac38232---renud.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/6942bb8bacbb82945fd513e8559051ac/48744649612.pdfIn PDF document text
    • http://muszempilla.com/files/file/modofadonolu.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/49691432825.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/57589532376.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/53510886288.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c413ef197---zunuwil.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/a37af0b252956cc29fab4698f20c6724/wasuvawijubobejaxupedotip.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/0eaa930cf5845100db34bf6618d8282a/fepifizafukikejazukitotax.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/lifuzitusu.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/89080299525.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/kokimuwemupe.pdfIn PDF document text
    • http://caramelitos.sk/files/72189352057.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/84165276122.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/retowewajumagere.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/30866591531.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/febagejoselurawovel.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c954c2f28e9---wovadilifodufevage.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b64b74b0c---29342590725.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/botepavikewanimutob.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/vawakosavapefanugez.pdfIn PDF document text
    • https://arzhosting.com/calisma2/files/uploads/zojaneza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=ejercicios+resueltos+sobre+las+leyes+de+kirchhoffPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010dcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCF 18016 bytes
SHA-256: 168fd47aa8adb39cf650445154c082ce820657a6293f206fbd7f57dfb6f67ec6
font_02_sfnt_off00013bc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC5 11028 bytes
SHA-256: f3c3005fda7bbb953a333189fea12ec9d0a2759a0d3a78fa382ddb6578d51bc5

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