Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e65672bf9aa980a…

MALICIOUS

PDF

71.0 KB Created: 2021-09-09 13:11:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7b016b9a44baaa4d5e1a9ffa562d604b SHA-1: 41111364101161bc44586448dfd11c02f51b7ba2 SHA-256: 4e65672bf9aa980a392a778f55fd27f15933cb8b9517fb0f1d0e37733f271a9e
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to distribute malicious content or conduct phishing. The presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a deliberate effort to create a network of redirecting links, likely to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://huntic.ru/uplcv?utm_term=hd+stickers+packs+for+whatsapp+apk PDF link annotation
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec9f5a3cf2---15811123875.pdfIn PDF document text
    • https://lapakunited.com/contents/files/97043595545.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/42339604670.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/43686411688.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/19354487188.pdfIn PDF document text
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/v547gmanpcbphq0ap5t8iqfb9a/xasorezalamarojepugejujet.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/sokowelojurunuxosefulez.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dipulemavutim.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161307748e5911---kokebew.pdfIn PDF document text
    • https://digireg.org/upload/92297652810.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/wapog.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/43876348788.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/64400135993.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/b74a97594d10a08edd610e2ba1aa4ffd/12413121756.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/ed0706e3d85c888e045d5191dce5f248/32663946965.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/jodibiniko.pdfIn PDF document text
    • http://baove24h.org/upload/files/93810620353.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/sotivajadatokibokujeko.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-6/20210906122720535841.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351fea670d6---tatinefejiv.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/lamanevarakilopes.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/ad578a9c9e9f9b123999ef35b603ad2e/vixajodegajenamokiwe.pdfIn PDF document text
    • http://dytac.hk/userfiles/60338675536.pdfIn PDF document text
    • 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_off0000b2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F8 10736 bytes
SHA-256: 69d77328d949d77e17459b77b4bc591d200532e96e78afb9645753c89d75ac31
font_01_sfnt_off0000cbd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E8 16872 bytes
SHA-256: 13c84d7f52cbe66bb870962eb43bc55ddb0577fb7676d13864d784906d7d7b16

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