Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b51d3193741c7a9…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 10:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b5bd0d45b34f5c4ea5bf7d9947d47829 SHA-1: 6a7d2ecd9289299d638ffd262de916a71c966207 SHA-256: 6b51d3193741c7a9e6697d18372173eb20291e03164641c523a981d1f87ba79a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable domains and compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://catamma.ru/uplcv?utm_term=fifty+shades+of+freed+watch PDF link annotation
    • http://abwalabamaave.com/uploads/files/fiwejixawowabun.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/jefijepo.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///lofenako.pdfIn PDF document text
    • http://crmrealty360degree.in/ci/userfiles/files/bukiseponazerugowak.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/bewagegeti.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/32787109016.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/fotumuwagukupoxodada.pdfIn PDF document text
    • http://storemisr.com/uploads/files/memex.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141edd2a39e6---magojupuzokuzolozivovesi.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/98943276781.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/17/noralid.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/fewatexagazu.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/bokokojoxodanajojakana.pdfIn PDF document text
    • http://hitelesen.com/userfiles/file/32504467284.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142ab7dd82bd---wutonojuralisokuzi.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/591fc2f5afa7fa468b6c88574936cb7a/10838043536.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/vukevomawemurudesoxis.pdfIn PDF document text
    • http://godsownproperties.com/userfiles/file/kezelosuzodet.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/sazesunevorafaboz.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/xurinufibatelopetolaj.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/26521092857.pdfIn PDF document text
    • https://tele-video.ru/upload/files/sewefilejepalaxajenug.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/xulaxufak.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_off0000d385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD385 19392 bytes
SHA-256: 3e171d2ef483ac466bf5adfce2c5dc171d587ac7bb59c3bb2a84277e9f6e363b
font_01_sfnt_off0001065e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065E 10600 bytes
SHA-256: 5aa0fdb6b42e6a1c5f960e2373d8d1d31c73ef0419aed111e0dc5d96502e0374
font_02_sfnt_off00011ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1