Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a58b8a5cc4b720…

MALICIOUS

PDF

81.1 KB Created: 2021-07-07 23:32:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 57f14e6f9d5debf60566fd297889604c SHA-1: 514a8b23481b3af6a806cd5b6faee955a2ea8fec SHA-256: c4a58b8a5cc4b720eec92128e028f6db4e86fb4ae91e4d8374349f81f4f00ba1
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and embedded URLs are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee36cdd1c4---60846491613.pdf
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/tukufekedojolajesi.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/644fd9171de94b1f4c4a308a9d8d25fc/86106912995.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/7c7b0cf0a6117ec8ec96f9ac4ccf3b7e/lebixuveji.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/e14f42ac712d6e78c1abc7e1dc80834c/wefefamogavezizusoluwo.pdf
    • http://vdadanang.vn/app/webroot/assets/files/legidenuduv.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/cab315d67c961fc1a832bff639c63472/xiwotasuwovipipanizola.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e201c16d1---wosurexoporitux.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160783c541e533---73454047204.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609271df94845---46182793333.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160c7372dbcc4c---kojabikixapunememe.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f332d165dc---dibedox.pdf
    • http://andlupa.com/userfiles/file/feteluwikig.pdf
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/luvokoraxirejisemoxupuged.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c7121c4ebe3---nozubaxuj.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8b888c4f1---gikajo.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160871a13e9002---83148260726.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=172+centimeters+to+inches
    • 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_off0000dcd0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD0 16792 bytes
font_01_sfnt_off0000f4e7.bin
88ede182ca8bfbf8b8e3e43cbd83184bf3bf81fd4343a12e390608a792f3f8bb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E7 10412 bytes
font_02_sfnt_off00010c67.bin
0525301a5e43bd97c8cced793dccef17b2f4c45264bd77622bcd6e96133e94e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C67 16696 bytes