Malicious PDF — malware analysis report

Static analysis result for SHA-256 c95c7253b6dec6e7…

MALICIOUS

PDF

81.1 KB Created: 2021-08-13 03:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4884ac863d7725974f97b2cf07a571fc SHA-1: 2c3b6a7f4fe848a0818d317b4361964192b09bdb SHA-256: c95c7253b6dec6e74494ef66efcf6560ce8c92627a68d9de1ea43ccc1a0ac4e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to numerous external URLs hosted on potentially compromised or disposable domains. The presence of embedded URLs and the nature of the heuristics suggest the PDF is intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://inwebjor.ru/uplcv?utm_term=convert+pdf+a+autocad+gratis PDF link annotation
    • http://toyteepee.com/uploadfiles/file/2106201929172164303n87yc.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/ad765157d2e9517ade34969fc4cf9b99/tamonobef.pdfIn PDF document text
    • http://contextuae.com/resimler/files/36568242848.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210627_5E194899CB0BB9B5.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/f12f9ab3b7b826782115c90f665e8bb7/68568831600.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/3d8c37f96bcbdceabcd9078862ec8d83/93151640551.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/44b2f3cfda3bddcd1c6a139f99d57393/81684309098.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16078197c073ca---94413661735.pdfIn PDF document text
    • https://abeess.com/userfiles/file/54338435394.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd359c7040d---36552070178.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/nokojaxurazufij.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/dazakupexemoji.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16070d968f10d2---56018787185.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/neporoseseg.pdfIn PDF document text
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/81681488186.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/8a1u6les507ojhjh0gt3h4as16/gesanufezesurunukiniwizi.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/9np13fjtq02gm7asnalu2ggn07/24514337575.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/80669816506.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a582ce085ec---pubadunixisujo.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160abcb46e2f60---duxugazabigipunuxanesuje.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/od5qdf1npnr8844053i5njvg4a/jopojetazudisejog.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/52959550409.pdfIn PDF document text
    • 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_off0000d15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15C 10948 bytes
SHA-256: ce506d0f7c37373bcdca9b96cffcc3c6a8f99f830e5fe5e7508ec2519ec2e2d4
font_01_sfnt_off0000eabf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D1 20740 bytes
SHA-256: 3462f81211b94c57da197ca15e709490bd9769ac13b66ae3008fb5fbb99428cc

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