Malicious PDF — malware analysis report

Static analysis result for SHA-256 94ae8d42f81c8027…

MALICIOUS

PDF

72.4 KB Created: 2021-06-26 09:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9da13b4b1ce4612b4246a8f7ec9443e2 SHA-1: 57147a11eabce7e31336da6eefb57a59b17d8df9 SHA-256: 94ae8d42f81c8027c4ad8a569a6fc9be0ce734408abfb8620418e6b77ea816cd
176 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, but the presence of external URIs pointing to potentially malicious content is a clear indicator of an attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9e2235e56---nejimelowikagixire.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846ea9bd026---noxupapijoxitegoka.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/ad0d506bcdead94f13405343b5a87880/96142289488.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bf9e6a2dd---65869942481.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/768b1e2b0111ebd212b66c86a8a0aedf/97704638479.pdf
    • https://nestsearch.in/admin/uploads/file/350054648.pdf
    • https://radmangroup-ye.com/rgfiles/file/89680795037.pdf
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/3cd7601dbbdee4c7844129e8039aea3f/63018236718.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b72d3c3f835---99826791841.pdf
    • https://ruiguoex.com/upfile/files/2021/06/03/33947514866.pdf
    • http://beloezoloto.ru/userfiles/file/zibera.pdf
    • https://armandofalconi.net/userfiles/file/zazejomalariloxorazem.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16080f3bec13c5---jopilexolakexopasonoxigud.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d8025a546---14356315470.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac27747ffd---duzuxezuwijijevonezobaga.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/2c8b9d79dc4f0bb6335a0d93ba2195d2/59273652331.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/v76remr0nttotdl5gogbgv6l00/disazodimoribifumaselomuv.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ba3f13432---wofunisitusariv.pdf
    • http://garderoba.sk/images/_file/26374661048.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6db236a19---nopotimajed.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/nonuzujamifowogosinaboki.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bdab300debf---wazizekefokaviduv.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724898ce65c---mezubebigos.pdf
    • https://al-wesam.com/userfiles/files/tolitafokijus.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=wade+organic+chemistry+solutions+manual+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://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_off0000b9ce.bin
390032da0a541a85d88f5524f8c41e532eb007f32c9de808d41454df86c7ee94
pdf-font-stream PDF embedded font (sfnt) at offset 0xB9CE 11272 bytes
font_01_sfnt_off0000d3da.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DA 16792 bytes
font_02_sfnt_off0000ebec.bin
ce663680cc3e3784563896817654ae56935e8d777f904d84d9eb3d35c05896f5
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEC 15504 bytes