Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f90a3856950bc85…

MALICIOUS

PDF

86.1 KB Created: 2021-09-11 17:27:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f24d3761a317558c98bb7fd4b45eac6f SHA-1: ec7ce74e704f378b00e3e7cd54a405ed6150ab2a SHA-256: 1f90a3856950bc85c28df0034d985a9e5f60dfb99889a30c4c149c2459f36981
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of external URIs and link farms on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://osakaav.com/userfiles/files/76419142649.pdf In PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/21b9792e9f881d2be8c5a2aee1d09602/54753911301.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/voboxedojujazigoravu.pdfIn PDF document text
    • http://cserepakcio.hu/xdata/file/gelipovijejejemomefu.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/17669971958.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/28112368566.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613446339ba26---pafotesavajamalireleto.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/biloxavona.pdfIn PDF document text
    • http://skalamatbaa.com/userfiles/file/kafumeruxivivis.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/vunigegoluvazox.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/denebiguko.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137b54023526---31292398275.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/guwuwetewoxafovemoro.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/23231443083.pdfIn PDF document text
    • https://nada70.org/userfiles/file/tinuzibitujoduxigokokaw.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/nobilizetuwetis.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/rasedobukemow.pdfIn PDF document text
    • https://securitydm.net/slicice/file/wimosutu.pdfIn PDF document text
    • http://vln.nl/files/file/16655909271.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/jisamoxotut.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/3441298624.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/femenuzo.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109101745369277.pdfIn PDF document text
    • https://bunexim.dascalita.ro/app/webroot/files/userfiles/files/wufikenikevanimolalifis.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/tajizew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=avengers+endgame+full+movie+online+free+tamilrockersPDF 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_off0000e765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE765 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF77 18764 bytes
SHA-256: 47826cccb9d714c65fa52e885e339ae8e107a5ebb2d80b0e3d25df2ab521f48b
font_02_sfnt_off000130ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130AC 11060 bytes
SHA-256: 0b4e71c283e79559c8c61f87dd9f480f507aed62cc0d5dfd156fefd99939bf50

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