Malicious PDF — malware analysis report

Static analysis result for SHA-256 b18a2d021dd59a2b…

MALICIOUS

PDF

77.9 KB Created: 2021-06-20 11:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 78155dcbba76b0633637df3c94d4afa5 SHA-1: d496173a9f4502d3091b07a11ce6fc0b224434ce SHA-256: b18a2d021dd59a2b73d6a94a673e01528851d6c5b92318289479e95438a02e6b
184 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, indicating a high likelihood of malicious intent. The heuristics reveal multiple links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to host or redirect to malicious content. The presence of a 'download button' lure further supports the phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/ucfhb9sju743kapfll7ldorq43/62183368671.pdf In PDF document text
    • http://creptiles.dk/userfiles/file/27300396506.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2711991b59---kodetulonikumezoxezebika.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c142c3b77---toxuvetatixejosuso.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/3531598395.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607759fdd6e9e---tizawukegobat.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/464e4fa895c4918828f1ba3533aadf6c/gizerefinokubamabodaw.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/diburepajezeti.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/55f839f960d866e7903d7f9b50846721/buwemidorikavezaludijov.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160769a402a694---bupasilejefupesog.pdfPDF link annotation
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f850de928---48058336213.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/2f9c008a274ea1225ad3d24309e2f87b/popoxepikodifepiwibuj.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/kilepo.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/suzovikazififebosinu.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8882d27c12---82936477080.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078e07cdca06---59886205293.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/gokarekabode.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/38452559214.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5dd97ae920---61256283053.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+setup+vr+minecraftPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE577 5124 bytes
SHA-256: 7a185998338098d931ad01d12b84e38e1c97c86d1c47c7212c34c532de3752ea
font_01_sfnt_off0000f6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DE 11012 bytes
SHA-256: a616adca6474d3ad27efc5ec48bd48cf1047ed1a968e095fd811b46f4d818c76
font_02_sfnt_off00011c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C31 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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