Malicious PDF — malware analysis report

Static analysis result for SHA-256 98a59feb4674f36c…

MALICIOUS

PDF

78.9 KB Created: 2021-09-06 16:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 746ed9b35063191a094e0ea8115e5ed3 SHA-1: ed9c9d00489ee1fc40361627bc8b247418fd0b45 SHA-256: 98a59feb4674f36c83d23cc9ec57466206e579a9046b92c50f8110bb0e40522e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to websites hosted on compromised WordPress installations or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a link farm designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://laros.cz/UserFiles/file/pafuwowizi.pdf In PDF document text
    • http://alkanboya.com/files/file///padugosudanidiveger.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/40393579709.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd733c8a452---balesilefisukolibizo.pdfIn PDF document text
    • http://zuche0551.com/upload/file/vabupofipekexikaw.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210621_FD23ACC038D04F9E.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/wexomesagoxinika.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c1661b1d7e2---36028769142.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/39227681107.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15d685206d---88496551582.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/turogozofozabuzisozibugab.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/todawab.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/ramekupokafugagot.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d5c994ffe---10318778706.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16119c68156e65---zejizovetosusozawoj.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/82404144663.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088341552b60---72550564168.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c748aac3a88---51904356720.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceb118115b1---soletabuduwujifo.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/ecfc46541ad4f565d89879ac89346d92/34888259689.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/19173662594.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/bobuxazewivodisarerujejex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=our+mother+tongue+a+guide+to+english+grammar+pdfPDF 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_off0000d0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DD 11068 bytes
SHA-256: 2977923833c02cc22ce94bcfc398345b0b59f3b81214cd537ce726d2bd1eac0e
font_02_sfnt_off00010241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10241 16720 bytes
SHA-256: f7dd320f97674f891ed13ee0a7659546a7d88603d4707826814ad811d4f91bc3

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