Malicious PDF — malware analysis report

Static analysis result for SHA-256 93cbe9aba3ed17ea…

MALICIOUS

PDF

81.6 KB Created: 2021-09-12 08:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8e3ba59a0cb5f0bbc0d11eeabd56c8e0 SHA-1: 0b28d3e521e25ea03336a80e2f935a37a249962c SHA-256: 93cbe9aba3ed17eadce1f81395800e0be5bb2a4a562416c930ad9de60957e081
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. ClamAV and ML classifiers identify this as a phishing or malicious PDF, likely intended to redirect users to malicious content. The embedded JavaScript is a common technique for obfuscating malicious redirects or initiating further exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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 https://www.paseppe.gr/ckfinder/userfiles/files/32007777091.pdf In PDF document text
    • http://sevimticaret.net/userfiles/file/zifavato.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/xewibaneloxejisumuv.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/65011858829.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a02adaf409---buwodezodipu.pdfIn PDF document text
    • http://w-mill.jp/images/file/varabivexi.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/lawajinosusidim.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210911092424.pdfIn PDF document text
    • http://cga82.com/admin/File/migijemadivudadoneninuve.pdfIn PDF document text
    • https://marbletreasures.com/uploads/image/files/84761989508.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/4dc02007e2f6fa24e88746d980e01c1d/69052799606.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/rafigegevow.pdfIn PDF document text
    • https://pasarantogel.com/contents/files/82534221609.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134e655397ca---laxukutobadunifew.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fab22b7de---33260009436.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/52253575714.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/e301bacce46dc0761e5c71c72cfc98b5/79086353900.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/23092644848.pdfIn PDF document text
    • https://dm288.rs/slicice/file/gorupuxejut.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/1032290166.pdfIn PDF document text
    • http://ippon.lv/uploads/File/xutunafasunizetola.pdfIn PDF document text
    • http://adria-ex.com/images/blog/file/31225448465.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/fetipamukojefosusaviri.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///56878334044.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/74715204449.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=watch+tokyo+drift+putlockerPDF 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_off0000d837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD837 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF049 18364 bytes
SHA-256: 0b21dfe354a494681a5118d03a22d121097deee869af695486b30c1a9a6202d7
font_02_sfnt_off00011fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE1 10744 bytes
SHA-256: 4df08ce8c857994f1efc6becea2fc58b5720d746dce8d90887f6bd1350e5b021

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