Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fd24c875ce0e6cb…

MALICIOUS

PDF

89.1 KB Created: 2021-07-08 06:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2b40bbe8c586fb6d6eaf54288348e562 SHA-1: 924df09566e6ce2c79986625b76161d68a7d3eab SHA-256: 1fd24c875ce0e6cb6013589584906fd292154821fbe9417ca60e348a2ef1beb1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document functions as a link farm, directing users to various compromised WordPress upload storage locations and disposable hosting sites, likely to trick them into downloading further malicious content. The presence of embedded URLs and the overall structure strongly suggest a phishing attempt designed to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yuss.it/file/nuzosej.pdf In PDF document text
    • http://petrduchek.com/files/95524951192.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8aa601e774---kemogebupotidaderumup.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3e29b6f86---zajojoguvelovanuwiwus.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/zegawalerilesireluk.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16081948e5cb11---sujip.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/taven.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/94982090320674c102f58cec45a64d65/45671341767.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210708091548.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/h7rufmom1iej32mj94970ns0r0/36526465760.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/lokopor.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/c6e5cf6c2735c399c6ae5aa671ee1b59/kemavoreguseranu.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/07-03-02-05-37-39.pdfIn PDF document text
    • https://tanthuantelecom.com/upload/fck/file/lizegip.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ac224d236---56384987851.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/20807112430.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160778e0e1e616---99807196114.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/fiforaluzitopitipu.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210622164751.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/rugegavujubi.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cbe1a1284---lobafetijavew.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb8af2b000---rijobevizepegudozet.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210702194706.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/98405f8c1cd71eabe9f92572386dea7f/8677494183.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/1e05fq81aij1e4e62gqiv7n997/99258980446.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210704091926.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160af709c17c81---64647681938.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160828a6af1479---16083106059.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=old+web+gamesPDF 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_off0000faaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C1 17148 bytes
SHA-256: 5470e6ef7bb823cda41c9c230a87a622fef4e083c69ab9d3c70b5ebd8f28df82
font_02_sfnt_off00013ff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF5 10328 bytes
SHA-256: 249b1df3711c02a5be0d9bc56ad1a52ae2407cb1acfc4ea3fcf266378b70a192

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