Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bd2cd3a16c3f0d2…

MALICIOUS

PDF

81.4 KB Created: 2021-09-02 06:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ce8cd1afb185f962081a02301d87d355 SHA-1: 745cd88743bda00498ad4fbffa463a53fa902213 SHA-256: 6bd2cd3a16c3f0d29cbb0835ce3b4eaeadbb88b680757fa2a2d232f912f9e857
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a link farm pointing to compromised upload storage and disposable hosting. This suggests the document is designed to redirect users to malicious sites, likely for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://sonarmusic.hu/up_image/file/sugifumozefuvepar.pdf In PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/rolanurotoneseta.pdfIn PDF document text
    • http://aroma--style.net/files/files/68388464297.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/43765401957.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/9001fc40d1282d507ec99f26b958db37/dapijeju.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/89160336889.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/37652503976.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/narolalifurakogif.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/kapavumenimufemid.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072dc51c3fe5---33659336100.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/57k432tji28p4c0insqtt6kp08/20305002258.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7a235ea45---4725185839.pdfIn PDF document text
    • http://kardelendalgicpompa.com/uploadfiles/file/nalukuvubuwegalelu.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/14548616990.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/zesifafovomivurosokaperuf.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9fcb38ef4---sunoromesiwufijafuxi.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/e9j2o3os11ho7ku8l27up3r18s/75066621143.pdfIn PDF document text
    • http://1-cx.com/ckfinder/userfiles/files/sapemem.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/goxagexipewajix.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/91809065598.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/92671824825.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=personality+assessment+inventory+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_off0000d678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD678 18152 bytes
SHA-256: 80736b2260019efcb507091fd544552af43f48f335f0fb838457b1fb8118cfe9
font_01_sfnt_off00010592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10592 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011da9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA9 10552 bytes
SHA-256: 77a78255ddfa292c2be6169b80734043a69e448020b40ba2f441bf5507f5c2bc

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