Malicious PDF — malware analysis report

Static analysis result for SHA-256 b69db4e8857db722…

MALICIOUS

PDF

71.6 KB Created: 2021-05-29 01:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d5740d218bc756d7960a854a9ec7980 SHA-1: 780d8537bffee603d18b2831d60cee5114a51647 SHA-256: b69db4e8857db72224721b9b36febf7566413d7cb146a2b6f57cedd6cfc0b323
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body, though partially corrupted, contains metadata related to 'wkhtmltopdf' and a Netflix title, possibly as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a9276a1a225---vaweso.pdf
    • https://luyenthitoeic.info/userfiles/file/71474351720.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/cb60f5556c408631e96f1e8b695a965d/fetitazu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b939b825dd---xilep.pdf
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/26fadf5bcbb63247f5814c48c5916199/57223690916.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d34998dd6a---88310814017.pdf
    • http://aarogyamedico.com/userfiles/file/68274031459.pdf
    • https://mfdesign.hu/files/file/lodazax.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/143d5d1f4565494da6980c8a1ecacbc2/24779918407.pdf
    • http://aircond.md/upload_fck/file/82768614229.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160746bfc67ed6---32458387359.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609277bc9c9fd---kedutuwu.pdf
    • http://akinmedical.com/uploads/file/95333371886.pdf
    • https://harrisitalia.it/uploads/file/dorebabaxox.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/3d10efcbd79f36d2acc7199989a7b05e/matutukelu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=a+todos+los+chicos+de+los+que+me+enamor%25C3%25A9+3+netflix
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db78.bin
81c982c4b8edcd648aa87f2b2d7fa4da8157f2e4dc0ca52d1d0a4b02af459211		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB78 5748 bytes
font_01_sfnt_off0000ee9a.bin
9990da7b2fee45b87810b4963845a4c9dc436034ad719a5a0ae177fd169501f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9A 11792 bytes

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