Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb420906af642ada…

MALICIOUS

PDF

76.6 KB Created: 2021-09-10 16:17:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5067e4fe96dc650827fde173eeace95e SHA-1: f89c113f3e3e1e2b2b24aff38b252f671475fe16 SHA-256: eb420906af642ada4006405be5673f2ddbc500ae04ef379d8ea1d97484df41fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or lead them to further malicious content. While no scripts were explicitly extracted, the PDF structure and URL analysis suggest it's designed to exploit user trust and direct them to potentially harmful resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391ececc1ba---50265845518.pdf In PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137cb6a21af7---29988422758.pdfIn PDF document text
    • https://adikkedua.com/contents/files/25999933648.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/nisoxevupupogi.pdfIn PDF document text
    • https://ibericadearmerias.com/file/72329613729.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a14f607d1---moxut.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/kudugijixekarufuxeza.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/78962362361.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/78081529428.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/ef68518d9faca7cda7a8409487b2af2b/86823347169.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/xalizupod.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/38259716986.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/zovipefokole.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135269f7dc62---46697289427.pdfIn PDF document text
    • http://atomleasing.ru/media/File/zeperu.pdfIn PDF document text
    • http://screen.by/images/file/xudiludibutifewakuxoki.pdfIn PDF document text
    • https://888nv.ru/userfiles/file/laxizezewav.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/068453f74209b589ee1a8033133ca082/77715395400.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/40507240217.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/fewezuxogekekepupuxele.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/2826920099.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/90555000951.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/11511731178.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/78364897955.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=khul+ja+sim+sim+full+web+series+download+480pPDF 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_off0000c0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0BF 18684 bytes
SHA-256: 9c3caa8912c5c91d0e877e4ea18443081321f93a64e9e5eb4a6340cc2df528e7
font_01_sfnt_off0000f116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF116 11520 bytes
SHA-256: 2476cfcfddbbe33bd5d446efa0422808e8b30d1004aa90af49878318b61ecd3e
font_02_sfnt_off00010bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1