Malicious PDF — malware analysis report

Static analysis result for SHA-256 d97b1d75fe47c5cd…

MALICIOUS

PDF

78.9 KB Created: 2021-09-09 16:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 409c99d24766a20d310b9a7114cd9bf1 SHA-1: 0b14a1362ff987e2593544efa0a9ca6665650552 SHA-256: d97b1d75fe47c5cd4ec88c721f2d9e54024ae0582af200bd163f9ac462103540
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is a common method for executing malicious code or redirecting users to further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://primaria-ciocirlia.ro/media/file/11265889151.pdf In PDF document text
    • http://flomojapan.com/upload/files/dujerotutafatobazo.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/14026757837.pdfIn PDF document text
    • http://stattus.com/assets/file/66274886857.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/25096197148.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/29271022995.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/5575337182.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/47220628159.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/45865367296.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/gixagepoxilogi.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f80563c716---momegufatajage.pdfIn PDF document text
    • http://kccmaul.com/files/files/91044654921.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/sobosimoxudes.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/sizekozep.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/wokozemurejisepeketarada.pdfIn PDF document text
    • https://terracell.pt/images/file/12235087489.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/64327698792.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/73774060498.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613966cbc83b6---batipigawakig.pdfIn PDF document text
    • http://atoutslegion.com/userfiles/file/vofamewesoselife.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/72771042079.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/33238910327.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137edc8cc921---33711187353.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc5ca5fcdb---13652049601.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/xuwitowetojadavaralel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=redmi+note+5+pro+vs+redmi+note+10+proPDF 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_off0000c89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89D 10764 bytes
SHA-256: 92492b351f721b4db62d9ebdcca90d30dd73dbf3f8eff0959b52e999575f43fd
font_01_sfnt_off0000e172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE172 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF984 19816 bytes
SHA-256: 0890efbab4bc5e10c9a64d1ca94d118f11c993b6ae877b90b2faffa9233978c1

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