Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce1a25769db5580f…

MALICIOUS

PDF

83.7 KB Created: 2021-09-05 14:34:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 99f54ea967f05af6b69646232bb5960b SHA-1: 5c52249ce5f546e1eff80feb6391354364fd56ca SHA-256: ce1a25769db5580f1a6cb946ba0a7a2ce08cc6f110314652d50352dd170c4e07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/6737feb614639afd19c2d66c4d462846/54017145707.pdf In PDF document text
    • http://samafb.org/uploadfilefiles/43621101229.pdfIn PDF document text
    • http://scmsalliance.com/clients/864514/File/kobupoxulixawik.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/91931220967.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/kunofuzupovawubadurodir.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/mimipunelabu.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/belujuri.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/97492544012.pdfIn PDF document text
    • http://goldmustang.ru/files/files/lexunowupudalikapabet.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f45187aa0b---dugosibijajadiriganed.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/2813e1590f8d365356a6b2f84ec8917a/wugibufilidawuxetopuj.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/punivanosojefujefo.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/kexemuribu.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/445fe876e37c4011db152366d8c96498/vaxaxitefikeni.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/tidazuboxef.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/98876476810.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/fimidog.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8337a7c91---kumarud.pdfIn PDF document text
    • https://hssanesteban.cl/files/xavotevuwojoz.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115cc23a7250---12488830600.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/dcbdc834ed69b2e33e1f5e62d88881b2/tobinixekosag.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/mumesanekaxepafud.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/8044995706.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=plantronics+voyager+pro+hd+bluetooth+headset+manualPDF 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_off0000e013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE013 11384 bytes
SHA-256: dca8f2553fd14238994cca532f3a73064ba2fc626ce9370da0105290abe98bea
font_01_sfnt_off0000fa4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4E 17700 bytes
SHA-256: b85bfca8d80a2e9a104d202a68cc77244850e67bc7e2b7ec7ed0e1270644243c
font_02_sfnt_off00012868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12868 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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