Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2af3ad8f2673d4b…

MALICIOUS

PDF

80.0 KB Created: 2021-09-11 12:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0b1662e4c4c0a068b443dd6904a90462 SHA-1: 973f4ab86c03209df283f80d50c8f9d042f4c284 SHA-256: f2af3ad8f2673d4b5a8c4a3f2d304c0c660bd4432514f1ca33f1d9c1a434a671
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the exploitation of PDF vulnerabilities to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://maryalo.com/userData/board/file/tabos.pdf In PDF document text
    • http://alvit-bk.ru/userfiles/file/96973699775.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/jatojonurugomavogoxu.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/29745580436.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210911_1E30F2E464AEA547.pdfIn PDF document text
    • http://tianfonmm.com/d/files/karixusazabex.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/kuzumazosaj.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5516124be---16622640702.pdfIn PDF document text
    • http://liyangah.com/Upload/file/45778761718.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/5beeb55cf3e8716301fd4d1a573beeea/82689362632.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/5f7f29ee1ea8c9cff14014ec891a4b91/47984759420.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/59809358429.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132516875f05---xosomamorebi.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/43352818579.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/vozulon.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/wedekokowikes.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/70234052691.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/47436931711.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134387d32571---13229959626.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/66753126514.pdfIn PDF document text
    • https://pgprojekt.pl/Upload/file/zakoxomiligum.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/89228302322.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139087b4a1df---wivobuvemolup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=m20+stock+romPDF 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_off0000d3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B2 18832 bytes
SHA-256: e375709e9f08c03d03093007c46b2b5b3e79e56d7cfcd93338bcbe437f58fb6b
font_01_sfnt_off000103d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D5 10184 bytes
SHA-256: 2ffe186b1f4d1421daaf5def2b8e55d6e340c2dd165a2983e2fae73343b77536
font_02_sfnt_off00011acf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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