Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ee52bf98f1f9d71…

MALICIOUS

PDF

102.0 KB Created: 2021-07-30 10:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3ae2e782b82cedb42e2e99bcca248301 SHA-1: 60faa6d612312b5c162b9a58253b35532f6bd80b SHA-256: 6ee52bf98f1f9d717dfe56bb41e0ea3e05500cd4d1a594fd12556be32ee1ff64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the overall structure indicate a likely attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=what+are+the+5+major+branches+of+earth+science PDF link annotation
    • https://appchecar.com/ckfinder/userfiles/files/34035450739.pdfIn PDF document text
    • http://preserveproperties.com/userfiles/files/57021165572.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/ragoxejiwusazurekuxu.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7756384b6f---60236335021.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ad3958b08---rinaxifilitamedowob.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/54114525016.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/rutubazujipudamajixiruz.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160963fb904449---28471984856.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7eac98691b---13977137780.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/ca35cc60f9464b0bc65277b9475c3dc1/zisirad.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/8ba6bc02da15113c2fd24c63ad75058f/guwitum.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/kokoxubisopaju.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/rodaz.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c77d022c061---wufejazanolavijuzasusiw.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/b47ac49af46be7ce88281a5d3a27748a/pelinej.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07e176fa5d---penevukozinolimaxej.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5d54d609b9---pezati.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/2umcped3l4p0l8j16hp7g2bhvu/tojidanerukivusaridafag.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/ce3fcc49a668fb5a54a859f4e3fbadef/51338684107.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/koligozan.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/juzisiraxovalolizeforaseb.pdfIn PDF document text
    • https://arerp.kr/data/file///15581247499.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/bijozesokaniraputemoxi.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746751b4246---59606646337.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/35cddb25f6272bfe0a81bf5a6480a308/difuneworavemopuw.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_off0001208b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208B 22260 bytes
SHA-256: cb793a8922f42718b7c2371baf930a365a5d635b92cd3b3d9f7720caf9aadc56
font_01_sfnt_off00015849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15849 10952 bytes
SHA-256: 96cce68814273ee0ddd44081e26c60e9a70360c4d447cf61682d254308132a75
font_02_sfnt_off00017192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17192 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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