Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f24886be189d7dc…

MALICIOUS

PDF

86.5 KB Created: 2021-07-01 18:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3b96a2cee5494c2531eaebf12131b76e SHA-1: c53e70bc4e91c8949fee472c64452eb5334bea8b SHA-256: 2f24886be189d7dc381b772c9b7eb3da1508f0da3c0175972ba174617b0b93c4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and compromised CMS upload links strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pistant.ru/uplcv?utm_term=best+way+to+saute+onions
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e57654e029---karepinujejevowimawoluxo.pdf
    • https://oxi-dental.ro/imagini_ws/59924262103.pdf
    • https://alquimia.in/admin/fckeditor/editorfile/45873402892.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aabb0fdb2b0---97614503044.pdf
    • http://goodwill.as/userfiles/file/2454767676.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/673b5cb5b406203ee0d5a5096aa379bc/kazosiburejexilobepolonu.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f477f70e89---manopegojonexutajelulabiv.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a354fd34368---80539148342.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/f8f5b09b0f8cb357b2f7ca371b973df9/loberelekegegiribi.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd34c865a62---2386928488.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/d9663e464904a07085dbc894c4f6abb3/7956897893.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a81c14db15a---26694966619.pdf
    • http://vce34.ru/attachments/file/fudebonekimeladizi.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2ecbe25a4---sosugexodegekumorikeraser.pdf
    • http://mcleod-bobbitt.com/clients/64742/File/suxanuwogagid.pdf
    • http://daycamhoa.net/upload/UploadFiles/files/92700667427.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16095f7dce3408---60004665069.pdf
    • http://fzsvybbs.at/userfiles/file/61607332483.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b52afa06991---xusawigefudejijirobipo.pdf
    • http://kcde.kr/userfiles/file/rufubenezepujas.pdf
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/597e20a5f0c6823dec74e1a56eb7c363/kenadorusejan.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a720d9adab4---39272422582.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/5h713k2bmjlhef3s6ksmqaoqpv/liwesenivopoxuvowamub.pdf
    • http://nusamulticentralestari.com/Uploads/userfiles/files/sisavisonijaxebasu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f150.bin
e8186a174dff60a48337447d6c9dc48ffff2d800f76cd233c68e1a3c097285f5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF150 10308 bytes
font_01_sfnt_off000108d0.bin
1b2c950690bdd5269894ccbf375db8aae00fb9228cd2b6dea8d76232d5131334
pdf-font-stream PDF embedded font (sfnt) at offset 0x108D0 16956 bytes
font_02_sfnt_off000134e0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x134E0 16792 bytes