Malicious PDF — malware analysis report

Static analysis result for SHA-256 65a95416f463d255…

MALICIOUS

PDF

87.5 KB Created: 2021-06-29 01:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0cc7279e658c41bf5700937710c6e272 SHA-1: e9bb71eb4eebb096d900cb703f86d4edd3175ec3 SHA-256: 65a95416f463d255e96a019937e668038ab5ed99ad3464c08975e89f0c8925af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of external URIs and compromised CMS uploads points to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://infrive.ru/uplcv?utm_term=what+is+the+plural+form+of+sky PDF link annotation
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1b047b8d0---maguzijunawuruxeze.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/39o4atskblt56q175jb6jt476h/wililiwobixum.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8ba90ddd2---kopoladubizonaxo.pdfIn PDF document text
    • http://renovator.cz/files/file/xezelakeminireraneduwud.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/156876872824ebfddbce45327b6a287a/muroxanopegixogola.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16094a4f8679c0---giwopekexerabefidewemuvan.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089bbb93071e---nubitaxat.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85c07f1058---jotimolazedejul.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/vaxiwikimewebipofalevu.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607926b1eea8a---1323671204.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6aa4825ac---82793989450.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/vugalepofafi.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/nisazubexotufazewawuvafad.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/82735858893.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160beb679c9a32---71420515654.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/tapilebufudedofofafex.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afbc3fae421---4950566585.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/natixaripiposurodabem.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/f3hnvkjb9g1uev1phaf5tv9lnq/kuwipagitewejagew.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16084190145962---bajakikijaregoj.pdfIn PDF document text
    • http://wagnerfamilyreunion.com/clients/866685/File/19472840762.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/cc02dd1a293487f5d9ef50897b2dd322/zutepetemudarumef.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/kenukeruxiguridopozu.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/gq92u8nrolh2c9tpb4k1okgsj8/16419705309.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/gmve15rhpio1q22ac7efhc4pa4/mupiralosaletitesarevux.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD783 10820 bytes
SHA-256: b1f8641eeef6604fa12cc9be4b0d8fdbf2ca0e838ec97b77ed353e864bd60b44
font_01_sfnt_off0000f082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF082 17832 bytes
SHA-256: cc4c888e9f2db6bffb820cdf37bbaaeedd970fc8a7dfd28ab9af05d73d137ec0
font_02_sfnt_off00010be6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE6 16796 bytes
SHA-256: 3315f420d1b70a402d4ce40a532a4b1273c3a944547a105864f8d4e2546cb263
font_03_sfnt_off000137ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1