Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee4f6015d712809f…

MALICIOUS

PDF

81.7 KB Created: 2021-09-06 13:27:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 18cc2f5e9b2fe723cd3f407592277c77 SHA-1: 60f16a7381fb514dc1a349de1e886e7cd8b25d4c SHA-256: ee4f6015d712809f073b52dfb79e73a2dd4991d6bfec4f6317330ee6c8c2a9bd
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS upload storage or disposable hosting, suggesting a link farm designed for phishing or malware distribution. The 'SE_INVOICE_LURE' heuristic indicates the document's content is likely a fake invoice or payment request to trick users into clicking these malicious links. ClamAV detection and ML classification further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://totoumi.jp/upload/file/wopunirazuxesijoba.pdf In PDF document text
    • https://energooptima.hu/upload/File/62443644330.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210807094431.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/xiluvelemener.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b93ebb3fbd9---88037807913.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3a0695071---38330147875.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/63657257043.pdfIn PDF document text
    • https://mintowncoffee.net/uploads/images/files/durekuporivo.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/22750978825.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210621000915.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/88706717800.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1612a44975dc4f---21998482767.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161293699d6675---4834538565.pdfIn PDF document text
    • http://vicorsupply.com/uploads/images//files/bejudomilazugoriwa.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/48752887694.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/7923964376.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/vifubeve.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5a6858b05---setokoram.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/77034100091.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/8dbf93d8da26cdabeb0625c39b76344b/gikugivubobobizu.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/sefudaxatojiwubasusot.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607feca5e8d56---905428080.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=epson+receipt+printer+manualPDF 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_off0000d79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79D 18456 bytes
SHA-256: 142b09eac90b21ea04f898253351a4310107a3384aee8d848506994462b1912d
font_01_sfnt_off00010778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10778 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8F 10620 bytes
SHA-256: 7f5a8b6f6f3ef9b140068c6b9452a8f53073da1f0c0f921c244df9d3947ffee0

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