Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbe63188dbc9b877…

MALICIOUS

PDF

76.6 KB Created: 2021-09-06 18:22:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4994ed6b88e2a80b0009d8c5a498dbb5 SHA-1: 0cf240b3ef0cb70d90f14abec851427efdc4a90a SHA-256: bbe63188dbc9b877a459fbcf0ed2f8738d7dc4072626e661f27941d2743dc55b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many of which point to compromised WordPress upload directories, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure align with techniques used to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/21239795cf9c2ee505dd420b6d578fec/fubesaj.pdf In PDF document text
    • https://zlataraburmevuckovic.com//files/dajerizixagixuwezoxobala.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a63f2b01480---55846636654.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210831123342.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/34362dbdbbd7bc0e7348f15cef24b34b/bagatomugelez.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/kifivedevu.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b197f96d08c---7085067631.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/25cd975334dbe0a376f4625f6f24441b/bixilekokarovamelereriwo.pdfIn PDF document text
    • http://kingdomdatesuae.com/userfiles/files/65965091812.pdfIn PDF document text
    • http://envigest.cz/upload/file/28911684402.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa//files/82239431969.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/pelibujenijozeniked.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/kogesitafa.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/63534305788.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/18085623851.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/45679367073.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/hjest0pk2ep15venguupuunupu/zetepapekumira.pdfIn PDF document text
    • https://teamcode.net/upload/files/67502022667.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/biwafijonitufofuz.pdfIn PDF document text
    • https://luminex.pl/upload/file/nenobotowudesebovadixefel.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/16567048327.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d4fb01d6884---bapefogesugopuwe.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161165c577d288---zafizizu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=naming+amines+practice+worksheetPDF 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_off0000c62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC62A 17268 bytes
SHA-256: ec3bc86e65787c5e4850f0e5e594d6bc027742f8bd74cd07c4fa4a1c6a9747da
font_01_sfnt_off0000f301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF301 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B18 10932 bytes
SHA-256: 1e77927011ed5853c584bc604abe9d1a2d81859d45f85367420acdedbdd2328b

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