Malicious PDF — malware analysis report

Static analysis result for SHA-256 f79002869eb6a8e2…

MALICIOUS

PDF

85.7 KB Created: 2021-09-01 06:14:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0ff16fbdccd21e5e8a34ac23a6af9a39 SHA-1: 098260e3a85eb83aadeed973e22ee22746321a0e SHA-256: f79002869eb6a8e2371269e2395406099a31a1674240cd28ed00448241fa4a77
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/h14seomf1ib18kr50uag099bc7/relul.pdf In PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/m31jc5mbce2cuma930citm7df5/puzamisetuwonavuxi.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/daliverabepajefulos.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/51679502064.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16085730c8eb72---86466414561.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/muxutiluboxuvuvuvugova.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/44009275870.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161125c4fdddc8---tetiporejikudemoxak.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/e1668d0ba9e6dde7f1e2bb0577f8aa10/11852521378.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/dcc9bcc8b92d9d9f17c239585e0e3afa/94243789036.pdfIn PDF document text
    • http://burfel.ru/upfiles/files/97883406397.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/vujinapugoro.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210506155126485.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/60852555628.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/52397318886.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/11014409281.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ecf274632---60884363481.pdfIn PDF document text
    • https://patc.fr/imagesfile/34984926975.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/besetevunamerixefomu.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/zodefogugagorujasuj.pdfIn PDF document text
    • http://hill-macktribe.com/clients/7/78/785e88641dcef8d5cadf71fa969cae92/File/85369150416.pdfIn PDF document text
    • http://www.seminariomenorvalencia.com/admin/lib/ckfinder/userfiles/files/bujimug.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/87996390984.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=film+names+for+dumb+charadesPDF 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_off0000e796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE796 18372 bytes
SHA-256: d7e1cfc0df4754e885b769cbaa3167d062195a7bafe4d77586b49b79e5fb4fe5
font_01_sfnt_off0001179c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB3 10860 bytes
SHA-256: 1e15cbe1d6421ee5f55c509f651ce1c483be2892fdd3299f095f93570b82f5c5

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