Malicious PDF — malware analysis report

Static analysis result for SHA-256 6238b206eb3c1ce6…

MALICIOUS

PDF

88.5 KB Created: 2021-07-23 03:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4405941e4e2bc3cb5605d66fa0b0e718 SHA-1: f9f0191f3e9c8682b5cce59ebddd4b31c40e7599 SHA-256: 6238b206eb3c1ce64bed4a499390c12f86a37db3ff80e32d179ff03c69cb7893
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It also features a link farm pointing to numerous external PDF files hosted on various domains, many of which are identified as compromised CMS uploads or disposable hosting. This suggests the PDF's primary purpose is to redirect users to these external resources, likely for phishing or to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://ahkkpcm.org/userfiles/xaturenagoxemi.pdf In PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/jorojafabenisedonine.pdfIn PDF document text
    • https://hostingalani.com/calisma2/files/uploads/95671724194.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/hdln95v811m7h4nljsr5m7eru3/27038648963.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e168f395a9.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/85707017969.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/toberexabuzanegono.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/50186370867.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/52061f5c5ec31cee3d633bd7de4d5296/nefeniwelimujukomeniro.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/jafunotewubupurenaxasoto.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa69301540---tigeliw.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/408504de51c80e0558bf292e260c4a3b/20113541937.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/u5knsf08fakmqooolgdb2n1kj3/ruletute.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/50876298974.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac7a278a8c---sukuxugewojedikida.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/pewikejurerewizuxag.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c0291414d---dagojurop.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608167b384294---58140005391.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/12974110137.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779357b8b4d---solesufiwivoduj.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/47337624483.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/c0gqjhht0bm07ujgckil9799gi/netapomivaxumiba.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/16153389077.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=executive+summary+of+a+poultry+business+plan+pdfPDF 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_off0000f588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF588 11288 bytes
SHA-256: 4ff7dcb95f484f0f436ffbb4dd709cfe123c709e1d1bb53b666f9971a9f7f5aa
font_01_sfnt_off00010fdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDC 16852 bytes
SHA-256: e7d183298693a032a03bee65a7f355bb8d9dd54cd08e735a02da5088e1eee30f
font_02_sfnt_off00013bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1