Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6515a926c745bd9…

MALICIOUS

PDF

72.6 KB Created: 2021-06-17 23:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a62312884435dc11783efff93803e18 SHA-1: b6e4099ceee83ea2845d1397778c59fc85c8d792 SHA-256: a6515a926c745bd99dbc2630b6cdde8beedb7e266eb8b55371fe451c9e26d6d0
96 Risk Score

Malware Insights

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

The ML classifier strongly indicates this PDF is malicious. It contains a link farm pointing to multiple compromised WordPress sites, suggesting a redirection chain to malicious content. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a pattern of using compromised infrastructure for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/60943bdd2ddc93f9fa797995fdb611f3/32208352235.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/79ef6f0d15d339651a1198f582a09420/mogiruletozegon.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0ef9ec3fd---24997506305.pdf
    • http://hncastlecable.com/d/files/89225745219.pdf
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/e140afb0e330a4a8811a052b3a54c7ef/sedilafiwowa.pdf
    • https://daaeportrett.no/upload/file/56159854881.pdf
    • http://veraschwemmle.de/fckdata/file/dudarokovavafeduma.pdf
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/92261687457.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/ltsc7sjrq4q6n4q8gmdpd01occ/vaveluwopexenigofafibegaf.pdf
    • http://www.hangmandigital.com/files/file/64135848960.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/7a27a08ce30282498c698cef70275a60/99690295160.pdf
    • http://badaranquehablar.com/userfiles/files/19409348280.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/853d56326bf359aee1ed454c401d45a7/lezug.pdf
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/d65srrp4v9i48rhntsin70n0a1/80634165435.pdf
    • https://bharatbiodiesel.com/userfiles/file/72435052752.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c427ac62f48---35760780913.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d51496be82---86014824524.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=get+installed+app+list+android
    • 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_off0000e087.bin
6e5507d22e8f36b91eec6c6feb7247261a90970dbe61bee4ee249bd927fda004		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE087 4984 bytes
font_01_sfnt_off0000f188.bin
fbd9fd8d30981d104f54249cb5fcb86392ac01cce24205568a33e637cb101ee8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF188 10608 bytes

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