Malicious PDF — malware analysis report

Static analysis result for SHA-256 020f7a09782efcb7…

MALICIOUS

PDF

77.2 KB Created: 2021-09-19 22:01:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a738e151edec2c748cd804533663d976 SHA-1: 494d746a407d357d34d865799b9ad4f2f3561fb6 SHA-256: 020f7a09782efcb7a0df384adc4de788b8d1f31cd927862aeecf0abc6a9bcc59
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the link farm suggests it could be used to distribute further malicious content or for SEO poisoning. The presence of external URIs and link farm heuristics points towards a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • 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://sapporopools.com/contents/files/lukevafifabuxavobugonew.pdf In PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/vavajuvajuwasamutudow.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613486f53d151---maletoruzegokovawix.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/59231775910.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/35552638463.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/tefifeluju.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/98678224730.pdfIn PDF document text
    • https://mhreng.com/userfiles/file/26852061837.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/26129246359.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16146649400320---taxaxebedanizuku.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140e1db046ed---73693798225.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/77402381018.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/figubojotabavofogaxajo.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614050d609138---92927553366.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/bagekegidurasikapotape.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/66127636496.pdfIn PDF document text
    • https://brukspec.pl/upload/file/26664448884.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/69807789457.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/22154270203.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/21462334354.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/90030000183.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/jafezijabusobuzavepapaf.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/zodufege.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/xikovepiwadopotoxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=thea+stilton+and+the+mystery+in+paris+pdf+full+book+downloadPDF 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_off0000c57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC57D 18060 bytes
SHA-256: 3e212cc48f2673560d071370211b52b40dab3abd4ace30bf31d1f6280e5af50c
font_01_sfnt_off0000f467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF467 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7E 11260 bytes
SHA-256: 4ced3f075bd4a1cd3748946aeb64781d23e44d55fa58e8bcd0a58dd8d19f52dd

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