Malicious PDF — malware analysis report

Static analysis result for SHA-256 05ef0d861496111a…

MALICIOUS

PDF

83.7 KB Created: 2021-09-01 16:17:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fe8be1e1e66309f4c2280d3a8334cbc3 SHA-1: 90e77408d86a9dcf0e2fda58c7dd25fb4dde04cf SHA-256: 05ef0d861496111aeae014985a2f2ddfc13482fec582b160dd6f60bd51114313
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/uoq6fo641khqp7clsu6lclg8lq/81073466655.pdf In PDF document text
    • https://ka-base.no/images_students/files/60975461826.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/79409288668.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e62e6829f7f---64955826335.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160f9d503c96d1---ferikedefilazibetox.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161219e86bf2e9---1359705563.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161147c35e7056---vibirogerulipe.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/80337966839.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/f986f05ffe5e6cec34b4bbd7b33e05d8/17946526540.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/mnr5vtc8e4ee4tjaeveujjfogi/kenimapuxepedemavaroru.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/43673592201.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/wikukeziveburekirajosax.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/76641691223.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/50607429969.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfbabc41c4---94894701399.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/88128258332.pdfIn PDF document text
    • http://royalgroup.at/tmp/xisera.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/kerobi.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/buvutixavonubetasovalonor.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/kibiras.pdfIn PDF document text
    • https://www.utn.ac.cr//sites/default/files/files/58269943816.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/vtralpsv925tmtmnipfnrf6fk1/70313498019.pdfIn PDF document text
    • http://yuha.be/_files/file/67660254542.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/kobilugapepozolefejaja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=300+blackout+incendiaryPDF 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_off0000e093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE093 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AA 10840 bytes
SHA-256: 6c03fb6dd9e7fb48230b3a6df71478d27225bf39533adcb05c38bc56c45f28c3
font_02_sfnt_off000111c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C6 17952 bytes
SHA-256: e7b5d714bfddd0026a4ed20ac1d693e64f958741736ef2089b00d7bb08268984

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