Malicious PDF — malware analysis report

Static analysis result for SHA-256 61c43a40e5a55e68…

MALICIOUS

PDF

99.8 KB Created: 2021-05-25 11:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d30a63d27f45d32fff3943cb8b03a3a1 SHA-1: 482f5ebe213489e09a98a5c0f76dee1c362fe120 SHA-256: 61c43a40e5a55e686a159a0c215e37cb65ca3729b81e022af97bfc3ff2ef6f87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to other PDFs hosted on compromised websites, suggesting a phishing or malware distribution scheme. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/a4e6f7747b13d85d0a5576d573d287d5/24964284930.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/7d32a15a7beae6f430ab3bf271038609/jisusodixod.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef44768aa7---vagelidap.pdf
    • https://parklanehotel.asia/userfiles/file/55215524224.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe302b70d5---sulilujixusukuzodotod.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/c47ad394b100252fad52111be11f6e8f/52056745826.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c033bd3277---53090759792.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/883eced9b7e68c56b343d64690afa30c/55547095064.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a94fa95436a---senuvu.pdf
    • http://www.look4job.gr/images/_user_na/file/vurujulukena.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/487b1dc6370c9234757ed7a8b842c908/pigexofiw.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160908fdf2d364---vudowiloxivi.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a56a5ca7a---fefufaxigotifarigap.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/sad4h81u44ct25tnse58q7rvk7/42856498209.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=bleach+immortal+soul+event+schedule+reddit
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001485f.bin
604be0d80d0f3ec53a47f6cf957329927b32d1df9a8299e31ca43261af4789a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1485F 5288 bytes
font_01_sfnt_off00015a33.bin
659a7d7f8f0fddfbeccf3c1c2254784238f84203ca5e70fc65ba3b48722c9643		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15A33 11616 bytes

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