Malicious PDF — malware analysis report

Static analysis result for SHA-256 87fb33010951bef6…

MALICIOUS

PDF

108.4 KB Created: 2021-06-25 15:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 727082a100e570e22d7ce6fcacaac7af SHA-1: cdd82fd5c86c5ce15a6e7396516e8f67d3d9e645 SHA-256: 87fb33010951bef6ecd0f42cbb1e1773efca6047c37e918e91d5928a528ee9b2
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and link farms on potentially compromised CMS uploads points to a tactic of leveraging existing infrastructure for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38ab483de9---81240453778.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac95053dc3f---38887225750.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607583aa5bf4a---vitegetatoxot.pdf
    • https://erdenetpost.mn/userfiles/files/sagufisexetamekeserepo.pdf
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/3n37j4hiec7mq2iljf4muu2rti/20345338721.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bbefbc208ce---nexirexavewibenitifefe.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/fa23452c28fe2767fc1904bf089972ed/99218897989.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3325ca49f4---bufofuxivuf.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16093ace34a6fc---rixalagewit.pdf
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/00ckj4jc27jm38kqvvcpvs64ld/81480788225.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/sgjqrq1gsu43cipn1dqrv9omj2/tunorulalubi.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/deqg5qlokqmo71ep90k95l35j4/6742034502.pdf
    • http://sola-brothers.com/userfiles/file/kinakipamajazub.pdf
    • http://caigeshi.com/uploadfile/file/2021052905362573499.pdf
    • http://cpils.com/userfiles/file/ravusetivolanofadigokaza.pdf
    • http://royalrep.com/userfiles/files/sojaruni.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=incorporated+private+partnership+act
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001464c.bin
4456642e754e034e1e08c21b1b772c3fe9af588b879d5c9b8ea48ffa989a39df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1464C 18180 bytes
font_01_sfnt_off0001748c.bin
cee3ab658153341cc6c7b780ba4623875a95e8943d4705ca93cbe6cf6ecbf626		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1748C 10584 bytes
font_02_sfnt_off00018cad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18CAD 16792 bytes

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