Malicious PDF — malware analysis report

Static analysis result for SHA-256 4121bd23144468a1…

MALICIOUS

PDF

76.1 KB Created: 2021-09-14 10:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 12d9bef7360f69dceed018b281a615a6 SHA-1: eecf52d6b279b0492fc3da63e36ceab3c15139a6 SHA-256: 4121bd23144468a15a7609ef97c246488381cd502fb3aa2895ef924bf7e3c867
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of external links, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=mod+rise+of+berk PDF link annotation
    • https://lederstuhlshop.de/ckfinder/userfiles/files/wibimejubadu.pdfIn PDF document text
    • http://agavietnam.com/img/files/zabowolelodekuzo.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/ea70b230010ebdd93f4ba79a41324578/7519274677.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/jelolusakuvojurizexikafo.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/redoreji.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/79777336083.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/lijoxomafufu.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/4104320306dc57525d79aa87532b2ba0/81932419462.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/50424883842.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/tevazisiludokilevogav.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/wakonavaloba.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/nasovinogotufizulotixewa.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/55557917091.pdfIn PDF document text
    • https://jurvamartin.com/userfiles/file/43378347338.pdfIn PDF document text
    • http://lactopad.com/uploads/files/welugobegeso.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fababc641d03318466e4562b493385fe/jumimiritugufobiwur.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/nafikesoxaxefapufagow.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a450b05294---73545005196.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/lixipoxufipaxudip.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/433cee0ed6e9b2f656119354f85e5d50/pewobiwufipikifawivo.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/juvuro.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/xelotizupajawef.pdfIn PDF document text
    • http://vkts.se/userfiles/file/geseminokadanivik.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/56686515461.pdfIn PDF document text
    • http://arsvet.ru/img/upload/mefimunadeka.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_off0000c889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC889 16764 bytes
SHA-256: 95aead3931cdf85a733bd141e344e3bbee47d8a5f729aaeeeb5406dddf3c13cf
font_01_sfnt_off0000f38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA2 10164 bytes
SHA-256: 9ccdce6f9d10ba283bb5c3f62d8050d7423da6d3bdf223841c5643d119c753ea

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