Malicious PDF — malware analysis report

Static analysis result for SHA-256 93d81a09d9cae247…

MALICIOUS

PDF

81.3 KB Created: 2021-09-12 06:42:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 68dad953d583225019f485dde0d04638 SHA-1: f26c682b9ca790377816250e5cbecd9c5f5009e7 SHA-256: 93d81a09d9cae247b0bae738185264a1cc0e530c97b8d83672c10a8f75f41c24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics suggests a deliberate effort to create a link farm for SEO manipulation or to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://smidgel.ru/uplcv?utm_term=rsweeps+casino+app+download PDF link annotation
    • http://asfalon.com/__files/file/80897104587.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/45789753140.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/81815044068.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/42900437180.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/tepebejilibu.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/23437364452.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/kunorokurofemobosipiw.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/xuponedisutipokar.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/befazamogutubemafulus.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/pewari.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355813ab160---35729569626.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/ramobemuja.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/jelupinezuzulinoti.pdfIn PDF document text
    • http://stefani.cz/fck/file/44104879116.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d411f29a8a---gerejokobi.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/24505592675.pdfIn PDF document text
    • http://gurukripapublicschool.org/userfiles/file/xerow.pdfIn PDF document text
    • http://all-premium.com/user_file/files/6602597342.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161370b2f14986---43467476547.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/70983513380.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/34919509476.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jubukezixifapolokotagis.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9b77ac19b---42755432077.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc3c0d2d7b---wefanopo.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_off0000da4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4B 10440 bytes
SHA-256: 4cdc80588fa73e59edbc2bde9b9de0c4ec376cda536cbabd3d07976331278f95
font_01_sfnt_off0000f218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF218 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2A 17688 bytes
SHA-256: 491d63dd921cf66d31a860d06f0e301d50771c0a0d3ff47130e0e2c7e813bf9c

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