Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e28ea2c0051cf15…

MALICIOUS

PDF

69.9 KB Created: 2021-09-27 15:20:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4a4f93e66fffe2419a08e8e2aaa8dbc4 SHA-1: cb15c057385df61a20518d5af56777889b35509a SHA-256: 0e28ea2c0051cf155bedbb070108e13a2144fbb1a4dc799a87f1929f54a57e79
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 http://restokrat.info/userfiles/file/886276080.pdf In PDF document text
    • http://intelekt.biz/uploads/pages/files/sixutowo.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/pasekete.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/29847301867.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141337d10ee0---dogigiresujedademu.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/08/96521316949.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/makagukuzamowizifigu.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/lanewe.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/31090549497.pdfIn PDF document text
    • http://kaies.net/upfiles/file/serawutexeralut.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/winotepunivow.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16148c13640b23---subirolunak.pdfIn PDF document text
    • http://skupka54.ru/upload/m/63022562607.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/zimomagitopovapolefu.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/83214833125.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/24042693797.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/4710663595.pdfIn PDF document text
    • https://full-e.com/app/webroot/userfiles/files/20210920_054747.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/161391f1e294f0---jebevogeno.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/tugujetufivijigitegivob.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/38727813843.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/13759062071.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/wowifulewurur.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b664536fe3---kijexudu.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/51303211272.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/42128708932.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=windows+control+android+phonePDF 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_off0000b290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB290 15488 bytes
SHA-256: a64863fe8837945e90b5312269c627d4d8bb9c7a96504cadac9b9ed8f21376ca
font_01_sfnt_off0000d9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AB 10688 bytes
SHA-256: 5af4f5ab7a525a0abce3a92d7aa1cb9440362c42273d01df414b3794dff3b2ec
font_02_sfnt_off0000f22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1