Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cae1da114b663af…

MALICIOUS

PDF

79.3 KB Created: 2021-09-17 23:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 448fed02d17502c17a97d59f1a8bd877 SHA-1: 9bd47cb6e07d36aee7bd3e4569fb1663ed0cf43a SHA-256: 7cae1da114b663afbd02fa3520910de500c4872a1b895bc4bc97a00663ca8dc4
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external PDF files hosted on various domains, many of which appear to be compromised WordPress sites. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download an archive, which is often used to bypass security controls by encrypting malicious payloads. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=android+installing+apps+without+permission PDF link annotation
    • https://gruppopolidori.com/upload/image/file/92151665863.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/jutiwuz.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/zipuxomitumosozizop.pdfIn PDF document text
    • http://fohow77.ru/upload/file/58068376289.pdfIn PDF document text
    • https://pyccenter.com/images/Upload/file/88536144115.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6c17041ee---86582952709.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/32776378448.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/78221013300.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/kogufubiwutafutoremik.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/85917739447.pdfIn PDF document text
    • http://irths.com/upload_files/files/rafosokobuxe.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/buxemunujodafexofiwedase.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a38ed310e---87620966299.pdfIn PDF document text
    • http://bodymart.in/ckfinder/userfiles/files/zetap.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613577d3b44d1---gafeduviwivefexagijen.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/51940182306.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/jufolepoxifufeva.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210913_5822F4FCDD34686F.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/14942033273.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/25463281009.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/wumumewejugedokajazekogo.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/60638883480.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/6764677581.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_off0000cf57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF57 17936 bytes
SHA-256: a24aed183037e674654d0ab041cccef8f8ecde362a6b0fb60fedd693f327ec98
font_01_sfnt_off0000fe59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11670 11004 bytes
SHA-256: d30d950bb0e462bfe7f02b269c594e5c204c85ac5becac238ada4dcc8717a5a4

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