Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6dd3ff8739f0d8e…

MALICIOUS

PDF

81.7 KB Created: 2021-09-09 10:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d1fc75cce4a1ad821c8e589db3cdd06e SHA-1: 00e48ea5ae078784439b28ba67ca2fc91977680c SHA-256: c6dd3ff8739f0d8ec0e9344236266291edef0e58e17a0af50e0e48773032ba2d
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within PDF documents. Heuristics indicate the PDF hosts a link farm on disposable hosting and points to compromised CMS upload storage, suggesting an attempt to distribute malicious files or redirect users to phishing sites. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://walnutcreekguide.com/wysiwygfiles/file/62331923210.pdf In PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/8035523254.pdfIn PDF document text
    • http://punaide.com/userfiles/files/wanavovabir.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349eef93be3---sagizupixufuxiwu.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/7842990146.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/menilobesag.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/tuzisazit.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136a60a5eb5c---40455697701.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/70835381169.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109041111371730.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/rujinasevazalora.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/32833783537.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109031525058095.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/rudoj.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/38220288492.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132279570435---97599794152.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/42887966200.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/zudonabajofiwupatamokobi.pdfIn PDF document text
    • http://thermocomfort.ca/userfiles/file/25200577872.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/14413593942.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/88978938963.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613576bc201e4---2508400998.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/45044545767.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/82989369589.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/90660683744.pdfIn PDF document text
    • http://holzbau-napetschnig.at/wemabujoxufo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=dear+comrade+full+movie+downloadPDF 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_off0000dc3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3E 17236 bytes
SHA-256: 147aa08ce626c0a6c23e474418dc3c6075829cce88e03cee1f18a4f0fc37fefb
font_01_sfnt_off000108c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C2 10624 bytes
SHA-256: a4f84b17b22b54aa165c802c395ae3ba3741a7fbdc85955bad47bb657365e335
font_02_sfnt_off0001210b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1