Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ce9abd36167985f…

MALICIOUS

PDF

84.3 KB Created: 2021-09-14 02:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1e90d78d10266a09e4c7de5efdd7aca5 SHA-1: d0a458184991f81ea7ead5758dd3fa0ba3f5883c SHA-256: 6ce9abd36167985f3a9493e3594cc6ce88d62d214277120eb8cc90522558943d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are identified as a link farm on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=sms+restore+and+backup+app PDF link annotation
    • http://speed-r.com/js/upload/files/kaxotakamawozazatew.pdfIn PDF document text
    • http://chikatere.com/Upload/files/29319356308.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/21118018561.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/25724564691.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/gugixor.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/zigapuvalu.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/wejofug.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/27753679918.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/xedapavef.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/jadulesewetitewofaxetevo.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/29853860565.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/kuwebukuzagujebaz.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe7eb5afd9---zixafetaw.pdfIn PDF document text
    • https://msiutilities.net/documents/nanodiwugetosag.pdfIn PDF document text
    • http://poiskvod.ru/images/file/51309713034.pdfIn PDF document text
    • http://canadianrockies.info/files/file/kolofa.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/d5c187d7d1760a806f8a4361b39dbaeb/68416157114.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/32687098386.pdfIn PDF document text
    • http://crm333.com/documentos/file/kaxugonetemes.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/49495991306.pdfIn PDF document text
    • http://mobiliteit.nu/files/limowemolavisidakumafad.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/61653347375.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/6ee8e9569156c223b38189a9847f172d/45720900039.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/46154480629.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/puzigefe.pdfIn PDF document text
    • http://airzo.net/userData/board/file/zuzakanazev.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_off0000e41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2D 17824 bytes
SHA-256: e1030a2585f6f41a86ce77e548008eb27a521c56a0868e93ee88f2967a3a0442
font_02_sfnt_off00012a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2A 10944 bytes
SHA-256: 415df2e635938cf5e8d9efcaa64fdf76adc270a584ed4dcb01582299bf7da297

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