Malicious PDF — malware analysis report

Static analysis result for SHA-256 36a5f9818081848e…

MALICIOUS

PDF

72.1 KB Created: 2021-09-07 20:35:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 63aaaa4aeacb5796e69bc6944658c37c SHA-1: b7a187866630e5f8ace57e47cd0ddcc0bfacc87a SHA-256: 36a5f9818081848e457365f8e3e893379cb17ab9d6e0d53e07f37bad07e186e2
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The structure suggests it's a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073c46aa1f0a---15755779236.pdf In PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/pezitisejuzegebekobid.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/a5324baeb887a5527b60d6f647d8b4c8/lawotovavajuxatoj.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/96234329023.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/9ae430439c5dd89804bd773d9b91a00d/2701212685.pdfIn PDF document text
    • http://rjt1.org/upload/files/vaxegiriledixi.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/4543845089.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/bosukepiwiro.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/niromedepinonevik.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/50671941910.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/93620898929.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/632a453180476ef3fc1ea9c8221ebd59/ridelizip.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/17414308088.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/9fa7a906b57f6ff65334cd0c11f2516c/zipegobafobujigutoxil.pdfIn PDF document text
    • http://tidomusica.com/uploads//files/202108120852415756.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/vujepadosemijuporuze.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/69052467841.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/35942676108.pdfIn PDF document text
    • http://ubest.ru/images/file/29818183521.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c30e77715e6---66046163477.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/74aaaba668e4e1b5f7f1ab7e44e2ff48/94022975822.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/48344323805.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/43932516555.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/28t8cg5js4s2juhdufpcqtgeoa/19439669348.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/52542164736.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/e0a5f600116050bc3e2eae0a113a5134/67897157190.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=canon+lide+210+manualePDF 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_off0000b882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB882 16544 bytes
SHA-256: ad442341d932ba799d3bdc1045bcb3450552c6c201c8a01ef4eb9e4bb4d1be9b
font_01_sfnt_off0000e333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE333 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4A 10468 bytes
SHA-256: 2c54dd71e52f57f61322b248658a40c416b3c6f346395092ff4516797a657706

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