Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f254a0928c1c694…

MALICIOUS

PDF

180.6 KB Created: 2021-06-29 15:29:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 945f3d47db88131ab0ea0a694abac75d SHA-1: aa4f2728f7c406ccef3a36612568a4f844503684 SHA-256: 9f254a0928c1c694ad11201f3c8d5cf129f06f24423372b898994f313a60bddd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised WordPress sites, suggesting a link farm designed to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The presence of multiple PDF links on disposable hosting and the use of UTM parameters in some URLs further support a campaign aimed at SEO poisoning or deceptive downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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 https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/5009589d1143c1f51494b339b7ca2807/saviriwurazusipul.pdf
    • http://lawrence-spruill.com/clients/42275/File/furaxalo.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a9781fc34a6---lenupewurozavereje.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/ihd2dim7tot4tgqf5bb83pqvug/gitisigotubaporakero.pdf
    • http://mtecommerce.it/public/news/file/97716273658.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744905bfda4---razojuvomosunaxalikawebot.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a8e3842a2---dilarumufadevededavevu.pdf
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62740756121.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/2f15ebcaf7a99147e37607829adc84f3/bidojedip.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cacb7aa53a9---4786314961.pdf
    • https://fcr-fomentoconsumoerenda.com/uploads/files/xunolok.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7cede170d---xepab.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081aa06433fb---vubobaxivazesegotul.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/a77f9c0e7f8f7080a9be2b1dc31d2cf8/13666862145.pdf
    • http://andlupa.com/userfiles/file/80976472044.pdf
    • http://arohitourandtravels.com/userfiles/file/fiboliratixi.pdf
    • http://screen.by/images/file/kexetasowimokomunewot.pdf
    • http://gmei.lt/ckfinder/userfiles/files/46611166674.pdf
    • http://harasim.cz/uploaded/files/tonewo.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094039fa49c3---53025199848.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/83hjqmoo6o98774c2mmt4r9evh/40416003145.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16081e720dfb8c---sonimivujigarewimupurevi.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5b6d6b7d9f---delotof.pdf
    • https://proektasis.gr/admin/spaw2/uploads/files/sizasefuzotumegobuzo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=testing+electronic+components+pdf+free+download
    • 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_off00025e43.bin
28ec1a3a388f5b2dfdf2fdf246af761840951a593dba7e23a684025bae37e13b
pdf-font-stream PDF embedded font (sfnt) at offset 0x25E43 19292 bytes
font_01_sfnt_off00029111.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x29111 16792 bytes
font_02_sfnt_off0002a928.bin
d8ed9b5c8c31aea8950ee07b49a9fdba76af17b44ad1493f4d67f9471311f664
pdf-font-stream PDF embedded font (sfnt) at offset 0x2A928 11012 bytes