Malicious PDF — malware analysis report

Static analysis result for SHA-256 730cca23788f1ec2…

MALICIOUS

PDF

75.4 KB Created: 2021-06-18 10:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e86c473f9a4567eec900ae34ac85f200 SHA-1: f5e86ee2c5145c3937a41abd49de64bf554f8567 SHA-256: 730cca23788f1ec2cb9da537e70ec58b5b0f06b75a4497301bd8e593f76c00af
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple links to potentially disposable hosting supports the conclusion that this document is part of a malicious campaign. No scripts were extracted, so the primary attack vector appears to be social engineering through the document's content and embedded links.

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://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/fed1d7b1c9707461a0d2937c2025e0cc/deludije.pdf
    • http://vdadanang.vn/app/webroot/assets/files/1439607180.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/f0fed635482abf5f60085f45c80a5908/konoponanivapolelokosesos.pdf
    • http://eko-inwest.eu/upload/file/40174817716.pdf
    • https://grandplaza.bg/uploads/assets/file/32016607053.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609be17b6335d---vosuposafavi.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/1b32b1a48cd94f0c4634e95a8e818351/dixidewiji.pdf
    • http://nawooelcs.com/upload/userfiles/2021/06/files/210602120327.pdf
    • http://ampletrekking.com/userfiles/file/8122131138.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/030710ecbc240bf40e72ec8103513b79/tonudaxulevifemoxuk.pdf
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/32037213717.pdf
    • https://llsindia.in/FCKeditor/file/93187703687.pdf
    • http://gamax-motor.cz/data/dokumenty/80547700651.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/09329971e12fc467d6413c827e48889a/todigavovimaw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=the+last+lecture+summary+pdf
    • 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_off0000e88e.bin
cd6010dd29632931ccfa675a3e18e5c4611efcca6fbdc74924055b5791f6837a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE88E 5444 bytes
font_01_sfnt_off0000faf0.bin
2a6fb9fe50e35eef0aee276d4b6ee3f92264da022c70a8314f424aec561ca423		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF0 11360 bytes

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