Malicious PDF — malware analysis report

Static analysis result for SHA-256 03916ef1104dbe04…

MALICIOUS

PDF

109.4 KB Created: 2021-07-25 01:31:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: e76e405a1214c69c31b0f8c384601ecd SHA-1: b0a3d295cd94dcc7bfa4ce05f4bc36ba9e6679f5 SHA-256: 03916ef1104dbe04907674ad6fb5a4fbd9d0cd8a72040e5e3f1297d90765937f
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, but the link farm structure itself is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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 https://blogsma.com/files/17484485558.pdf In PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/b12f15f48948168eccf1f4b1b7bfa573/45405258848.pdfIn PDF document text
    • http://massimoandyuethui.com/clients/69227/File/22225189683.pdfIn PDF document text
    • http://rokakisreunion.com/clients/a/a8/a85ca1e4cfc2bb88d767af442173b437/File/zitafagilidamizaxekupu.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/dfb449c952f58d3a37f897ded9328373/54549069645.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875e7ddf881---safitalale.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4cc0649032---dafis.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/7709bd1b2d6c3e3babed8be9bd12a1ff/34524135361.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f4df381ef1f---17285808360.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8a246de85---supofedadus.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/83825264016.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/tezoxelonured.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-21/20210621162539865175.pdfIn PDF document text
    • https://digireg.gr/upload/32839370962.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/8867563723.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/5389813848.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/xafubi.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/dikegutulivozupuvopexusu.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/nulade.pdfIn PDF document text
    • http://caramelitos.sk/files/kotit.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16096f5034edd4---xetuvozodomugozejezodelan.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087616c7a264---11366898437.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/wotagede.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/31764333732.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/78381432379.pdfIn PDF document text
    • http://servmed.net/userfiles/file/punimexov.pdfIn PDF document text
    • http://hollandunitedreunion.com/clients/5/52/52f3fdf721cdccceb566e47094f1d9de/File/57047875492.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/vufoxodagivazitagon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=caracter%C3%ADsticas+generales+del+modo+de+producci%C3%B3n+esclavistaPDF 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_off000143a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BBA 18456 bytes
SHA-256: 9ea77c98a4066a23e737e0ffd66184e4dd06931e39fe94e8c33118270b470af6
font_02_sfnt_off000189ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189ED 11252 bytes
SHA-256: dde1bcc6416953f627ee3429386c2efec10c180fd17bd25ea43611354e56eaa6

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