Malicious PDF — malware analysis report

Static analysis result for SHA-256 96c869195455ba6b…

MALICIOUS

PDF

74.9 KB Created: 2021-09-03 08:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e4fd3eb32484f19141c1779c487c47e6 SHA-1: c271acf69e5e1d2ec9c8d070634bfa21823caa4b SHA-256: 96c869195455ba6b0704aca1382aa633c334e48918245ad1f51b054940665e79
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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 https://catamma.ru/uplcv?utm_term=bernina+overlocker+800dl+manual PDF link annotation
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/d678d033489e0172dda5c98844c1d7fb/55356067187.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/dumanaletobaboma.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/jofemotufu.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c672360e657---13647068506.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/7b3f6970af9900f14f5142ad08d6767f/jufuxarolezi.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e39f5f24d---kewex.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/93ibhusmjmrkdobjc6m7o8ita6/8874904721.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/fefifiponafutegir.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///27055925211.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/j9rk8b7du9bhius0197vdenunh/71726405721.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/94671545800.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a64dc1d2590---92980577836.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/fikufiverelu.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c535aa334---81351390233.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/24661581421.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f25c32345---94373950893.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/tutifutakebidit.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090158d3c5f3---37258154205.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/20f5b60a0c7d545039d6daf6e5c8897b/29169143798.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce5a82ddeea---gukuzatotujimetodejawetes.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/49020517028.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608499abbab58---47207542363.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc70b21bd01---44745742172.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_off0000c008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC008 10908 bytes
SHA-256: 9da454c86d891662a6919d597bfb4dce460d5172644df2d84731b3be4fb7882d
font_01_sfnt_off0000d940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD940 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF152 17224 bytes
SHA-256: 9d0f76cec3e8ea92c8e6714d7cf7834ca548a0f822e08b710b57b4bb8670ccb4

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