Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f6b46e789a1b08c…

MALICIOUS

PDF

92.4 KB Created: 2021-09-20 10:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0b28eafdf10ec796a40e5547c3f6379a SHA-1: a36d81177c7642cfc532a7bba5d8b68a9156ff4c SHA-256: 1f6b46e789a1b08ca1d76f43b74af4a0329cfac51421e6947d6dd1ec540b1417
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure align with common phishing and malware distribution techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://irlanc.ru/uplcv?utm_term=halo+4+invincibility+cheat PDF link annotation
    • http://geobigoni.it/userfiles/files/vegumun.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/3d667dfd0528e83955e7d9379f4d7c97/61858230560.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/wodavukewagezozatipako.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f54dc2f13f---karolitorulutibagel.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/12365374359.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/24504564483.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109190233132934.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/64384689494.pdfIn PDF document text
    • http://mfcpavpos.ru/file/11264581186.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/mofevopa.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/95483035160.pdfIn PDF document text
    • http://bluebossa.pl/files/file/guwixobasi.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210917_F6F45070F642723F.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/wubelajomedofibugawufux.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/motomibo.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/79267391003.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6960dcb50---xixedezinipa.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210916_DB58665DF3B3C5B4.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109160459517440.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/46530501186.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/91794218621.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/jonipopewidad.pdfIn PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/88546850502.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/58696851933.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/e9f2bdb926439181d89802178e212fac/63496275819.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/dafuxuzada.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_off0001042f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042F 18580 bytes
SHA-256: 6f201ed9ab99428aced22eb0de35bcba11248d2cba1a0fcd66ea67a2bbb7606e
font_01_sfnt_off00013402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13402 10448 bytes
SHA-256: e6a8f16320156d0ee79272aed46fa38a81bd6dbc5afa7a474a9f092e39f9fc20
font_02_sfnt_off00014bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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