Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfc698948b009536…

MALICIOUS

PDF

83.4 KB Created: 2021-09-02 20:19:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5fa35fd31e7be87dc261fa383d6134cf SHA-1: bd9c7b114fbad0a85bd9628b38499d400b7b6486 SHA-256: bfc698948b009536245302dea5685ecc22b670bda669ab1671577529670296e4
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to exploit users by directing them to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8cab0ff9d---givowoninebalij.pdf In PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada7978cee9---55072526551.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/ab05faafa5a964da24cc05baccd8609e/89410295738.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021062503239_621778328.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dfac1786cc2---kimegidejemagefuvazopofe.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/r52fk9cbu49bt9ae23jtrfahpi/31737818334.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/4395147569.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/73124804694.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16121c67c6fc23---49536242413.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/73840552270.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608a91a5e49b5---66059420614.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/96378858981.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/0f8dee3e57d6476f0dd1ada8f5065fef/ximikutebosafikojafe.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/hf19j4epidt52v1fg0js331cd3/58525040716.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/k304ouq4ne3drailkjavhjrb5o/45803598372.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/zabupiruvabamibamuse.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/60339811742.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/zufijizunabetakesokexe.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/navokokanaropojixezer.pdfIn PDF document text
    • https://kristinanamaste.eu/files/16471474406.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/11330380571.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/rbfkrvqjvp9k17a3qmt11qnmo4/33400508860.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/47272142355.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3a83c6400---82456754865.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/cad4ba4f3adddb7391c05a6ea4a175cb/ketabawelulugidoxekuwiwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=patliputra+university+merit+list+pdfPDF 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_off0000d731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD731 20904 bytes
SHA-256: 3665eef41948c2b5ac75b7e6889cd74b990a971cb90bb6dee97f7caf3c668734
font_01_sfnt_off00010e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12667 10820 bytes
SHA-256: 2c49b396f4edabeb0d931172716ef38f4b75afcc3fadfde11ae09b05710c2ab1