Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf0f2ff183c420a8…

MALICIOUS

PDF

118.3 KB Created: 2021-08-16 16:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 44fefa83ea54e2759385b901f616f761 SHA-1: 172f621a5645de8474192545f770de42fab96a3e SHA-256: cf0f2ff183c420a8ce397de7be909d25d96186f0dea452ed8a4571b9f06348ac
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and URL patterns are consistent with a spearphishing attachment used to lure victims to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://vp-dmsh.ru/admin/ckfinder/userfiles/files/bumof.pdf In PDF document text
    • http://bafiti.com/sklep/userfiles/file/10943603016.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/7715719582.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f7ac5c3a6ab---14718203846.pdfIn PDF document text
    • http://xtra360.net/campannas/file/14573560679.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/2cf9a73e23f35782c0a831fc8727380e/kamujisamovoziwu.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b849dc4b833---gakilufulul.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/61ff45ce992efd4dee659c3d498e8cf9/fojolegevevusirap.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/mipadezixudegimazekupisi.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/93062841110.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/50dd7308adcd581b69ab74511b54f0e0/roxedidotobonuli.pdfIn PDF document text
    • http://bomtvplus.com/data/board/file/20210520032456.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/xotilokosozanom.pdfIn PDF document text
    • http://888chji.com/userfiles/files/jenabiponixasitakuja.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/junazolul.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/18929773419.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/6eadc2869d260102b277ea5728e1b9de/nodukumi.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/kugesuzutipu.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0402ac3dbec2342e6475df928e85fe39/62227470653.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/a58dnvdb4qildgg3tlh6290ra0/pufuporeravuluweliw.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/u84790miojq0sm0uli5lv97ra4/90552828033.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/c6i79nvmcf5qtpd603l02a4g84/90605471778.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/roboxekexupobajoxixefodu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=are+there+any+astronomical+events+going+onPDF 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_off000164a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CB2 20636 bytes
SHA-256: b436a2de0f48123ed82be32f70f9b0713201aac811c6a186c1acec45f6a46cdb
font_02_sfnt_off0001b193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B193 10840 bytes
SHA-256: 554865fef4843cda3564af66521339d725a8b1ae31420d2fef1536583dcd591f

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