Malicious PDF — malware analysis report

Static analysis result for SHA-256 0da8e8ca340f0f6b…

MALICIOUS

PDF

78.2 KB Created: 2021-09-04 19:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 655b40b47f65548d822abaf7493c483a SHA-1: ad3dcab379a36ddbf0ec6d276753bd4d30def190 SHA-256: 0da8e8ca340f0f6ba1ead134f6d229529daa391f51a0cdac8cc677cee8c02177
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories on various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/bvdgleorac3r373uka5pac2ahg/memamoru.pdf In PDF document text
    • http://artepcb.com/upload/files/49112485300.pdfIn PDF document text
    • https://polaria.cz/images/file/pitilegowigu.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/83215946128.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/68139198945.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/vitepoxawikixokaseb.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c4940e60bc---84512554380.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0ff45764a---52979024058.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104c732da7dc---kewonasupunigomapolime.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/juwitadajud.pdfIn PDF document text
    • https://martabaktelor.com/contents//files/roviw.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3d6e78b3e---lukasenixudolozisa.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/34727036104.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/161058ee401c94---mipazifufofexipo.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/62dec2e2a25b2ea552f50ae8d3ad73c7/gudusuxinuxetiwufugudike.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/25742452300.pdfIn PDF document text
    • http://uteambio.com/upload/files/46673857098.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdabe09169---jebijiromiwod.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/fosekibuxategitu.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/61899703072.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607546eb36777---67804606964.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=uponor+ecoflex+thermo+twin+pdfPDF 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_off0000c682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC682 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE99 10752 bytes
SHA-256: 22cdb06b3d81e5c16bfeef7af6f9d5753a97a6c72e99a054e83b643ea3a68c1d
font_02_sfnt_off0000f71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71C 20052 bytes
SHA-256: 939298dade1266febf187e5a837710e395019e919d52a4531f0c47e58bc0634a

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