Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee816c99a1bc0f26…

MALICIOUS

PDF

70.9 KB Created: 2021-06-03 14:42:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 75aa4b15f3b115b516bb435c0c5eaee0 SHA-1: d2a48c81a43beed98b920ac96ab810c663daec35 SHA-256: ee816c99a1bc0f26e1889578d20854a6c37acc1621cc29d34db72aed5b9a6e17
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains heuristics indicating it is a link farm pointing to compromised WordPress sites, specifically using the 'formcraft' plugin for file uploads. The document body, though partially corrupted, suggests a lure related to 'Inteligência emocional daniel goleman resenha'. The presence of external URIs and the ML classifier's high confidence score further support a malicious classification, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608c149eeacf2---tevitazawedaveziba.pdf In PDF document text
    • http://www.pattyn360.com/upload/forum/files/28231371565.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a225ad7cda5---borom.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609455fe16ce2---nasukekilugeridanibonovaj.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/55125759879.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/24084cc0cdafdcf7f15d361b472dbb64/8924685139.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/87189123664.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/tiwug.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5bd233a6a---40226711582.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/jebakuxiwusujam.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/farasosut.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/20785511121.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/kovubunidurokidese.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/61ae0415a14832ef54dcf3512551de7e/90226749800.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/24e86abefdef546a133c8ad8b653aff3/daxifeja.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/a76851edb6072a6b5f7b8eba71ee3ee6/nemesakofiwuruseripupu.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1608b204ce68d6---67835741106.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=intelig%25C3%25AAncia+emocional+daniel+goleman+resenhaPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD452 5440 bytes
SHA-256: f7f07e8b42ce4de70ea0bee09955315e80697773fe92cbdace4f833f3d9bd328
font_01_sfnt_off0000e661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE661 12064 bytes
SHA-256: cd4ad42c4cbdf1bf59a5a4355a5f0ecc9ce686dbadbb224f4be068f44ae9ccbc