Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aa469526f9acf1a…

MALICIOUS

PDF

85.9 KB Created: 2021-09-14 21:24:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d8fd38f90d2aaa331b47c7ce43daac20 SHA-1: a0d682511df300593c2176f0d880d0bac3cb7e73 SHA-256: 8aa469526f9acf1a618686c5d24a94a1486ae55c7387912c9819ce0214b4aadf
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to potentially malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 https://huntic.ru/uplcv?utm_term=how+to+check+my+phone+usage+android PDF link annotation
    • http://tomgiongvip.com/uploads/files/file/82108475174.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/20710597244.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/piled.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddb509a806---10168783295.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/luramowimimoroxe.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fupagozevof.pdfIn PDF document text
    • http://vodnik48.ru/content/file/vubujedegamefawu.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/fovobeduruvesinumek.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/moponisiwime.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132795e451a1---rubetufapogu.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/kudis.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-10/20210910132833423420.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/36862644211.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/norabigetugupa.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/letizefotipilab.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/terukosuvarujojudidebuk.pdfIn PDF document text
    • http://kesifveotesi.com/files/joxamubibugikuluxanexepow.pdfIn PDF document text
    • http://watchimport.eu/userfiles/file/50122359001.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/90492864167.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/jikijajugodozevis.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/20219405559131.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/karaweneretovulojod.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/dikodo.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/k716kuc55g76vs0ejl24bqmv4s/25690343253.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/84391226378.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/59978748718.pdfIn PDF document text
    • 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_off0000e91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001012d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012D 17768 bytes
SHA-256: 9b96e87a7f4f619085bae7925d0fac1730987d0eaeef68d71a21ba72ec61227c
font_02_sfnt_off00012f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F78 11296 bytes
SHA-256: a7c8acbe9c5e47d3f7e77c2d6bae03b8265842f740874a9503d65a35a04832cb

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