Malicious PDF — malware analysis report

Static analysis result for SHA-256 db4fa3740a2ff0aa…

MALICIOUS

PDF

87.7 KB Created: 2021-09-07 01:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: e6e7b1878916ce4b3a0fcac7651d7ace SHA-1: a3f7c97d94c314dee53f7002fb32779941c071b9 SHA-256: db4fa3740a2ff0aac118367ae9385110478a0dd61b6637da705d57c0b57276b5
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/82bc4bd7c5425599cabbd1d5fa419c04/lisefanibas.pdf In PDF document text
    • https://parc-hotel.info/file/39543316325.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ee410971dc7---22517598254.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/23012673444.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/mazojavoribezamidolinilo.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/susogepalitikixinozitu.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/fidenovixoka.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/760b69d3960bf4b83f03a1cc1979ddf2/wufijasan.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/norofadoxubepajugi.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/pulotujebakekurukajixelid.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ea324c426---sefufijapivenutebosobugu.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e390cb26763---70241843356.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/rimiruxosi.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/46234223231.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/91600585809.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/mewige.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609217795560d---gidijowivuveginifan.pdfIn PDF document text
    • https://fishuntpesca.it/file/49442782359.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a76b27942b---vugewive.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/6306293423.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160870f5c0e49a---59763417363.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/99741892281.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/zedosuvuziloginavig.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/xuzel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=geometry+worksheets+high+school+with+answersPDF 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_off0000f133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF133 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001094a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094A 11008 bytes
SHA-256: c6603eed81db0c63e4b6640ec6d9b43d128f72b02bb8645358dd3bf5bd9be6f2
font_02_sfnt_off000122d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D7 17848 bytes
SHA-256: 2868b2ba1c9b3cbc5ba80d875823b3239e335ac38a18c80963677ea8bccf9a8a

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