Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2ee5dbb0ea144a7…

MALICIOUS

PDF

81.4 KB Created: 2021-08-15 17:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ee463b5db18335b8e3efb8371fc79ff8 SHA-1: a78297d5bbbaf73d1984a2ec5c3d471427eb5b63 SHA-256: a2ee5dbb0ea144a7af465670cc186d458ef2c07f8ec2ccf9747569042b0b751b
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple websites, many of which are hosted on compromised WordPress installations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or to serve further malicious content. No scripts were extracted, but the structure and URL analysis point to a link-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/6todd044n491v9rah4ca5gvpao/88823148155.pdf In PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/0130cf67b5f43e703f85df1a7aaa0e57/94371593673.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a8022082e6b---34222171170.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16114348d8e80b---29120159644.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/47b7f122c1a8903cbee0ee79087ebc08/rawoluxewatevi.pdfIn PDF document text
    • https://susta.vn/userfiles/file/31167620970.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607760ed42ad8---43427230155.pdfIn PDF document text
    • https://service-panev.com/userfiles/vidojixanumasivipifino.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/mixonitabelo.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/durivujaperopele.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/42025382987.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1609d50b567005---vibojafuwetivubesofakit.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/562a3d40b27cd8e6e342a486cca26084/xuretogusalubisosarure.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c631bbea657---70506851191.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/89007855746.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881b31c6030---1081615724.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/e7n8kltl6i3236roseq0gmk1g3/pefiteludij.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210616112921_egpspt.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fc12cd39a---bexuvomomujofo.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d09cd1c14---42583967217.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/bowusunajopogifopudagaj.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091132736b27---mubemararuwaxafuwixewa.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/46790894845.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/f1612ff8c5cdb02d3bf611aaa42ed6aa/8168752908.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/6b0d139c710128d06df767284cf37313/lipogidefuwukijosawoneka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=el+transporte+pasivo+de+la+membrana+celularPDF 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_off0000dd6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57D 16064 bytes
SHA-256: 425401126db00b8074d1b62de22746a0d1402f85c5763958f8d689ecd2c8e202
font_02_sfnt_off00011da6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA6 10964 bytes
SHA-256: 1a4a2d9b7c27c673d3c704894efd05c0fdf862d576bad34a35752cc8708114b2