Malicious PDF — malware analysis report

Static analysis result for SHA-256 e062a26dcbb1aeeb…

MALICIOUS

PDF

72.4 KB Created: 2021-09-01 06:34:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b5716257f1dc03188df68209b8edd57e SHA-1: a946d36aa3e228af5868bec0dc99c57ed810f217 SHA-256: e062a26dcbb1aeeb14e049681a624e54b32d40f923f9b8bc069f0292ffca1139
156 Risk Score

Malware Insights

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

The PDF file 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 for phishing or malware distribution. The presence of multiple compromised CMS upload links reinforces the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072e12ae38ad---vivifudinenilipes.pdf In PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/1f8a78693bf4b2f873e4205573f7a582/72148631065.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/a7632a02490001239e4aee6ba235fb95/43809825131.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/kobamomisubomomibakow.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/ts4c3vgqrgf0g4dsrpr0j7simu/pixinekukonix.pdfIn PDF document text
    • http://meta-min.com/files/69690042508.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/vapodoruvubedebivuzabu.pdfIn PDF document text
    • http://andrewsexes.org/clients/867461/File/11038085841.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a79d3b1740e---17301908867.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/tivizivituxavizawi.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/42049730345.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/mixiwu.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e98287b0284---kazomituduburizuworis.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b31ec1e91a1---jezesimewinamewukesajili.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/dizofiwumufatafegebaj.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609e85726242f---90176830448.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/79270117121.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/54377808484.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/704e697936b83a6f7001d8f4ead9a2a6/97771544176.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/zunufuluvajalana.pdfIn PDF document text
    • https://0900107678.com/upload/file/99061940364.pdfIn PDF document text
    • http://shosholoza.de/file/sujinazokexisobumez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=drawing+of+playing+childrenPDF link annotation
    • https://mediaget.com/userfiles/files/zifulejewipovitubatowonun.pdfIn PDF document text
    • 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_off0000bcd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD6 10836 bytes
SHA-256: 2e4d07a4f938dbc184c8b40be43a27cd591031ab1a7ab7c72a44e668b302a11c
font_01_sfnt_off0000d597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD597 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA9 14784 bytes
SHA-256: bd1befb37c7e7dc187179c911f6669fd5cf72250cf74f293e37536b60dfec22f

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