Malicious PDF — malware analysis report

Static analysis result for SHA-256 f29b80c1f8239f9e…

MALICIOUS

PDF

83.0 KB Created: 2021-09-19 04:04:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6b1f7d28eaad99f351bdabc1a76e672e SHA-1: 20847c80c4569c989ba62fb51bf008e1aca06e3e SHA-256: f29b80c1f8239f9ed897d76093b70e7269669d1644731a63539f281e23d8e70f
196 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains heuristics indicating it's a link farm pointing to compromised CMS uploads and disposable hosting, and crucially, it instructs the user to disable security software. While no scripts were directly extracted, the nature of the heuristics and the security bypass instruction suggest it's designed to facilitate the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://bonaparte.cappencms.com/templates/files/xoxesomukog.pdf In PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/83660505804.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/zaxavirivikuxoxixusewu.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/zugotubawifuxawose.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/miwadarusebevisu.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/leluvojabiguxosasun.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/xikufuzozoluzaj.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/sanufibafowadurux.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/rujikuduvexojepowet.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/daximuxofu.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/fojoseruwo.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/59862611015.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/59830691887.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/nugoxibe.pdfIn PDF document text
    • http://valeneighbors.com/userimages/rizabaral.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613b229172af5---71111523432.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/veranasofafebekiti.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/vodugeler.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/4988476086.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/15795682266.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/0973b86297eb2f4772c1b4f4dc2b36ec/kupibekanuxoz.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vobomidokaka.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145c7e28ba1c---44818889739.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/13807915937.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16139eb12cb15c---sevaperexotedisawupe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+unlock+android+phone+pin+lock+if+forgottenPDF 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_off0000dfc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC6 17808 bytes
SHA-256: 77a6bc02ddb7148775480fa1102ef79a41fa75e4752982febd98542b4bd92080
font_01_sfnt_off00010ce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12500 11000 bytes
SHA-256: a1aaca50301f5dcedbb0b762cdec8f79e7110b3be811fddcdafe5ee87931fa4b

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