Malicious PDF — malware analysis report

Static analysis result for SHA-256 db8d68ea74676330…

MALICIOUS

PDF

68.0 KB Created: 2021-09-27 15:57:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 59f0503b853a08d8de0c8fe6111713c1 SHA-1: 509e3b8e3215d4807132c74d55c5823855441a58 SHA-256: db8d68ea74676330e46fa5e75204151c1fdcd8d9628ae2b5f22d58a1c992d513
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external URIs and link farm patterns, suggesting an intent to redirect users to potentially malicious websites. The presence of compromised CMS upload links further indicates a malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://mybed.tw/uploads/files/202109162131139038.pdf In PDF document text
    • http://computer-rudolstadt.de/upload/file/58119331904.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/fokekonuparuxu.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/jajufalukalazumu.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/67965606670.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/84c65eb981f5e71beeafc00389522864/rugarofifedax.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/befawujubilin.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/bumobozetod.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a2377f4de---81099793496.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/pibetumitubibo.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109090510346197.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148ce2e958cb---91237169683.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/38567544646.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/97443781933.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/xelibasev.pdfIn PDF document text
    • https://goldmenu.com/userfiles/file/bekewob.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/28335133962.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/bududagadadaxu.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/4bec133f56728bb8d562a59fdf38fed9/57209702694.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/77239941763.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/suzuzadulixulufelobiso.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/bddc85352f26cb9ce8df4c59ddc6a300/12005275489.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/51687863506.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=lenox+for+firestickPDF 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_off0000ae8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A4 10272 bytes
SHA-256: 8ebe93690a6bd7c0f413b5085585a5eca8d5bf5b5a43cea5c41bbaff396a8e2c
font_02_sfnt_off0000ddee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEE 14820 bytes
SHA-256: 4eaf9b4c13962a3065b250a106cf9ac406235a7d693f7bca1642ff6d4c8d1a24

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