Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe249e5b3b391a9d…

MALICIOUS

PDF

71.8 KB Created: 2021-09-01 03:05:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a876bce9e61601b9fa0880bbdcba7e7f SHA-1: 6601d6e813fa970a410e210e584f530c4e3cd6a1 SHA-256: fe249e5b3b391a9da3041819842eeb19e8e85e6bb6a758249a1eab0eedca8de8
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users to multiple compromised websites and disposable domains. These sites host further PDF files, indicating a likely phishing or malware distribution campaign. No scripts were extracted, but the structure suggests a multi-stage redirection to ultimately deliver a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://31kouqiang.com/userfiles/file/1628247524.pdf In PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/2hj2vtuj3ehm21r7isr92rp8e0/ronesomavotaruvufebider.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/sudarul.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/remutiw.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/73785de59fa9b43f0d50a7b44639d5cc/nomamudifugosakizit.pdfIn PDF document text
    • http://riversedgefm.com/files/file/46114994290.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/ruzasajabujilome.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/wenumojowilagudoropugukod.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b68ce44710---nokokirukemum.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8a31f319e---dugoritetakatawi.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/wumipewanup.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160baa9c0ebc1e---51519573721.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160882169e65c5---movas.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/jisewemobewazuxokotapifal.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/webekakufimamexi.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/9a943800d204070187e650080a79c78d/pezefavezilanofuweneliwit.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/lesobaxuzodij.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/silavufodugudeteke.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e48815f201---70107528026.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eaaf22ac32---julom.pdfIn PDF document text
    • http://balbu.hu/uploads/news/file/bofosulake.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/81425563576.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1040bc9fe4---12060548724.pdfIn PDF document text
    • https://akvaguru.hu/user/file/derofapopinemaxal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=deformation+of+materials+in+response+to+stressPDF 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_off0000ba34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA34 15476 bytes
SHA-256: 3d9e2dc7b78d59d9735b96163af29cfa725cf89a6c07cbad6a7df584ddc52b2d
font_01_sfnt_off0000e1e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E3 10520 bytes
SHA-256: 4c131b341206f553873354647e787e37590f30d27f9ec89d2da224620625a3b0
font_02_sfnt_off0000f9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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