Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f09c822423f8797…

MALICIOUS

PDF

71.1 KB Created: 2021-09-04 23:31:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bb8f61e077ce6c1bdc188012c0f16ee0 SHA-1: 275c372f88164a62e33d160b2eeded361113d0db SHA-256: 5f09c822423f87971b6fa33f5b64c0e8cc44e4c1cdc11698fc727438dc40fed1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm designed to obscure the true destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The file's structure and URL patterns suggest it's part of a campaign to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://discovercefalu.it/_data/images/file/71773063268.pdf In PDF document text
    • http://world-system-packet.com/userfiles/file/ranupigavugojowu.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c983d6e5f04---negevodefovijusoba.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/segir.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff6ec7c108---galowonaxusofo.pdfIn PDF document text
    • http://turnyras.lt/Files/file/54745524651.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/2057281170610d20c7e9337.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/71932452018.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ea0a8c6b9---4539422776.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/47562468502.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/namemadazexekoxilajiw.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/saganipijuvuvekoxomes.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/lozawazagejovogipite.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608417ecd5af5---21768238926.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/48451626860.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/59734548643.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/litasotuguzabanira.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210706211452.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/rowopog.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/wujubiziginewumux.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/7678913412.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/vuduguradebedudufu.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/darinivowukud.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/juduzasuw.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/vipuv.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202165118475155.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=art+of+war+sun+tzu+pdf+ebookPDF 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_off0000b8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8BD 14564 bytes
SHA-256: adf607309d665b1fa740fc0991bb160752e8c2f35bf13d1003334bb8d28c1460
font_01_sfnt_off0000dd2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF545 10812 bytes
SHA-256: 9e70aa2f4392b8740f41c2029cae10389f64d88abbd45ffb3d2b3d6a060e3e2d

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