Malicious PDF — malware analysis report

Static analysis result for SHA-256 e25e3350b87f2d8b…

MALICIOUS

PDF

82.5 KB Created: 2021-09-08 10:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6b84c880e241b1cd51904779cacf6020 SHA-1: 6750a18d003cccce419b0a6d16f2bf5d1995edb1 SHA-256: e25e3350b87f2d8b7f7ba5e8e9c6a7eb591018e664f646218fa43969c07b5961
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with many URLs pointing to compromised WordPress upload directories and disposable hosting. This suggests the document is designed to lure users to potentially malicious websites, possibly for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://fouladsazanco.com/Upload/file/18614798640.pdf In PDF document text
    • http://hzaidele.com/images/upload/File/kopudumowepunanegapizovap.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16101355920ceb---zegatanobidebefowaresudu.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9375cd427---webanujoreru.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c834a14188---55569326846.pdfIn PDF document text
    • http://enricobarraco.com/files/kasodukesijata.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/71812532356.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/69932880964.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16102d3acab545---warogabizupaxetexiw.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/19087276961.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/jujigolazimunukozoriki.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/8946120480.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/50316161937.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/robiwiwopo.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/eaff608893fa4381d7833a657118b9fc/wozakotapotinanukewudad.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16089412f49a82---zoxanuwekariwuvojutota.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/81687604862.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8b24e3fe15---83452396349.pdfIn PDF document text
    • http://email-database.info/userfiles/file/modowiwa.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/xanolukaluselojiwe.pdfIn PDF document text
    • http://temple.mo/userfiles/file/84858930064.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/gedklbak2p0jhvfc5tccdipfia/debawanepaxopomipuzeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=free+grade+book+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_off0000e159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE159 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96B 17176 bytes
SHA-256: 65e32252c07cd4e562a7a50716e556017c43a4b8e0d800961cc559f4f6d91791
font_02_sfnt_off00012581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12581 10372 bytes
SHA-256: 11f009467df24d307a3f3fa5584bd0753919e77b3a755b0446302a68ebc7b0d4

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