Malicious PDF — malware analysis report

Static analysis result for SHA-256 41d39fb5adf296e5…

MALICIOUS

PDF

92.2 KB Created: 2021-09-07 02:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2344986a6e31ac596721a5f338c2a143 SHA-1: bf5fb5c34576c98d544fa5a42d26c962844a7897 SHA-256: 41d39fb5adf296e5a897d1bd13f7dc120d2cf737a4239d241cadd6413f6c6cf2
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest a campaign designed to obscure the ultimate destination of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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 http://tikatalog.sk/_files/file/rezefetalej.pdf In PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/01d7084a5ac69a70c59dcbe07d362134/dezonenekabukopi.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/guzirifufijutamorojumura.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/niros.pdfIn PDF document text
    • http://bulmarconsult.com/files/70002132934.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/2270018650.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/asq1lltlhat3emcuddlv0s7os2/manojateruluwivejujalotib.pdfIn PDF document text
    • http://absigorta.com/E/file/mupeda.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16118a81833a58---tofesemezegavezewotiben.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/5dd417136ff13e2dd42533b8bbbbcfd7/5259867881.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/00262ae3e0e4c63a774357799c85e021/38197274300.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b95a41e12---xuzizejiborobaj.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/76uq5h85jmj1ujip2j4ksf2286/97031584995.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/3005687622.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610804cec9c7e---45729307720.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/76683833633.pdfIn PDF document text
    • http://apvn.info/userfiles/file/jejarawusimitet.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/tososogaxilatijodenoritek.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31efe32f18---63432778966.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada69e632e6---68867960567.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/fotukotizogituk.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/79d981285cc188c55412ea2788f22da2/bipuxafijizivevavi.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87ab34a927---28298532573.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/86815537097.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/wudedaxopodo.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c886c3cd66---vobamuvololaxojexes.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/gspgcr69k1kup5o6dtrstsqcd8/52447727089.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=four+ashramas+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF9 21116 bytes
SHA-256: f635f2923e29211bff94bccd3fb1a1a1541c89db79922c3dd6d79c45e089dee5
font_01_sfnt_off00013395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13395 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BAC 10368 bytes
SHA-256: c95dfb5654b7f94103fcc9c546cec2ecca2c539b3d7d5710ab1565a18a18249a