Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b65de1597b30ff3…

MALICIOUS

PDF

83.9 KB Created: 2021-09-01 05:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ce6dce2ad44034ca0009fe50cdf47d3f SHA-1: d80610a1a6d6d46189222e14cd9f1f6722b8cb27 SHA-256: 4b65de1597b30ff3dfd8266e9be7a882bfa268c9f3740d55af954b4f812eca8e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that exhibits characteristics of a phishing lure, specifically by providing instructions for an archive password. This is a common tactic to bypass gateway security by encrypting the actual malicious payload. The numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, further support this malicious intent. While no scripts were directly extracted, the PDF structure and heuristic firings strongly suggest a malicious payload delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://noihoithanhtuan.com/media/ftp/file/52905336739.pdf In PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/75be3be8cd7b5a216348ea03106b824e/duxuvofegiwoxed.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4322ce655---1500517644.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/madikuwovuwivibagava.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/dipiwezuvo.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/40671179589.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/2res1tnequp52qh2cfc04jbna5/7618183555.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/15506092405.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/divugipumefa.pdfIn PDF document text
    • http://citra.cl/userfiles/file/befojepimamemenosagokiti.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f461317e0a1---bofubiw.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/35539866590.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16115ef6812c9f---48528974459.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/8192387260.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/rafamozor.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160988fcab0ea5---jekum.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0095a225b---nafegibokiduzujuras.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/tukegikekaripafitur.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/zavivowive.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/enkn6kegrddj3ikspcc3rtmv7q/lifebomifedofomuza.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/25777778273.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/22090430032.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/52bcf0ff63ac43fb459e76d2f15aa4f2/53263604809.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609041277b398---kenojixaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=pdfelement+free+download+for+pcPDF 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_off0000e4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DA 16780 bytes
SHA-256: f4ab3663fbb35d1ba83072dc90cb9293e402b79411d6b568b4e2d7bc053cbd0a
font_01_sfnt_off00011091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11091 10608 bytes
SHA-256: 0e81d4a307ab3b172182a36931cbf3565de939a3c4c8d9c5ca67d9aeecb8eb3c
font_02_sfnt_off000128e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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