Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b3a3c65c154cd47…

MALICIOUS

PDF

88.0 KB Created: 2021-06-28 23:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 50e73e707e62a710661b9dd768eab32b SHA-1: 84787485bac454bdf0d3d835f38ee29b2935b2cc SHA-256: 1b3a3c65c154cd475a2b7666cd6154592916e979ff76b7f20a6943fd2078848c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and link farm behavior are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/d17264165ba55f656933f1bc839eeced/fomajifupuwosatad.pdf In PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a758892b316---80865541899.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/nkea7usj2k086mor2mmqdlkl35/gekiresawebefakujavap.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/58736484540.pdfIn PDF document text
    • https://reniuved.it/file/pugamavezusabaxonuto.pdfIn PDF document text
    • http://splogservice.ru/content/file/bejalaxafikuku.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/ruzaxozufidorekefokeli.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/06/24/file/pupunam.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/5c23be16f9d39e4d38f2269d19139b02/vewugoginifezenobalebevom.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/202161823035.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/62628106658.pdfIn PDF document text
    • http://sebatmakina.com/files/tuvofofemasoru.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/15605016977.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/sakuvisebizew.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f682ec4878---71683119754.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160704ce34cc35---xadilanefita.pdfIn PDF document text
    • http://tebsc.com/clients/84181/File/benotumibunegirikapo.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/vogaripibokulu.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/44aa08de19165deacda087f55f00b5f9/bojuzegijumuzetusejikim.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a772bb4b8---tovinitererurusovozilu.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/pukubuwiz.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c202f0eeadf---liwamekulamina.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=elements+of+a+friendly+letterPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1d74c8572---39569992921.pdfIn PDF document text
    • 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_off0000f400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF400 10612 bytes
SHA-256: 7c4e7cd2f32d3cd866fd9b46b50d353c345fa756c7f6b99f001fc504c4dfd53a
font_01_sfnt_off00010c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001244e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244E 17708 bytes
SHA-256: fcd337dbaba428ce9176247ecefd24f6e892fe388e7ef49b4e55ae300572c91f

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