Malicious PDF — malware analysis report

Static analysis result for SHA-256 e24ea844597a9b9e…

MALICIOUS

PDF

101.4 KB Created: 2021-06-28 23:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d5952ba44b1dbf5940cfc79bc994ea55 SHA-1: 8c26cb2893c53b8b1c2c03e91836d890d4ee9ab2 SHA-256: e24ea844597a9b9e60aef7181809e29b4e7d78209b33886843bd59653627a245
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by a ClamAV signature and an ML classifier, indicating it is likely a phishing or malware distribution lure. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. No scripts were extracted, and the document body was unreadable binary data, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gemculture.com/userfiles/file/88116123510.pdf In PDF document text
    • http://chukgoobok.com/files/fckeditor/file/favutetozererotuvomifum.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160991ed23e7ee---bomizimiduzakakafejugaf.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086dc49e8ca1---33561810689.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/mujek.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/94825540815.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/p8ispiqrsa47aqlo15tboj0q30/neripukewi.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608db1e4a3fb9---649100333.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/ultg2h7grj6gpr9nsov3orpuif/nusuridivalisazifutaxufo.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/jqjaov60n9us641omv189dag3f/zefopisulenirotun.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/vumufufosu.pdfIn PDF document text
    • https://dm288.com/slicice/file/pomefidijenu.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/75254351442.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/1973074102.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/9fb3e4ecfcfb8b3e9185f8a21f165822/30957201855.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/baxibexunawipitovewiji.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7641d712f---wawebumepikepowoliw.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/0f3a7967e64defe4fe36ba6a82900637/bufowexulese.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160915b729f970---47725087812.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=effort+in+a+relationship+quotesPDF 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_off00012b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B1E 17592 bytes
SHA-256: fc2ca28902d3b3e250089dabf103c4cb6f2c7ce6ac63464fcee801ae86904716
font_01_sfnt_off0001584f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1584F 10684 bytes
SHA-256: a13c4cebe6e5fef129c376ddc5afca2fe05695a1d6cd58942c4d6b1b15688963
font_02_sfnt_off000170b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1