Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3f3d5110fa2b74b…

MALICIOUS

PDF

90.3 KB Created: 2021-09-11 16:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 45819762fe8c04902b1bd6225e6ddb53 SHA-1: e573c60d1e03cd43b18baa0cb2ed68b0bea82dcb SHA-256: c3f3d5110fa2b74b91d07231c490dc8bc14c7d37a9b25fbb0ccaa2daba8d976a
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. The presence of multiple external URIs, including links to compromised CMS uploads and disposable hosting, strongly suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support its malicious nature, indicating it likely attempts to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9850

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 http://classiccar-jp.com/js/upload/files/xalajolosofamofakege.pdf In PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/46963550312.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/rugipowojadofa.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/pakolobowibima.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/pugesamewesiwojoxerawu.pdfIn PDF document text
    • https://esvigo.com/upload/files/8829740115.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/zotawidezixovusat.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/72053523545.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/11810511554.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/e57d1ceddf86c5580eaca50c3baa9d81/vibekuvuwi.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/kigakepebalugu.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/95347043744.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a790354244---43258911107.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/xagosedosuse.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/75596978718.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/jaduzufoxeruzaxel.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/72783904730.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/seziwaxadav.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/kupokux.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af2f198c14---gurodidawemijux.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/70203755086.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/mononenugakijuxuzogipa.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/6396564669.pdfIn PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/lomoxawutifetomisuta.pdfIn PDF document text
    • https://toscanafantastica.com/userfiles/file/58443532224.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=gta+5+full+apk+obb+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD14B 10592 bytes
SHA-256: bcfd30b4a4f0275e41249b8f299dc503ef2984e5b9e354ce870f6a01e52e3615
font_01_sfnt_off0000e984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE984 16380 bytes
SHA-256: ac738330041db42ff8f617a70d1a596d8e40266beef2c17652bceaf1a9a99172
font_02_sfnt_off0001000e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11820 23180 bytes
SHA-256: 9f6d09c262fa51d8bec19f4c19ec67bbcd8d82ed38886169798b81f40499ec16
font_04_sfnt_off000151a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151A8 1868 bytes
SHA-256: b44e304f4199d162c520aa61e4565b27969aa952fa2ee1db3f4cf671ae1a9eb8

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