Malicious PDF — malware analysis report

Static analysis result for SHA-256 55ff00a176a79697…

MALICIOUS

PDF

78.3 KB Created: 2021-09-15 06:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 50545ca0170211ff984291750d867188 SHA-1: afa773c52a929b97022c531423e4a4d4481521a1 SHA-256: 55ff00a176a79697bbaa9031eda890af528df20c32b346bb9b86637b0961b3f7
156 Risk Score

Malware Insights

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

The PDF contains numerous 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, likely related to phishing or delivering a secondary payload. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e37121e372---tavabafafitozig.pdf In PDF document text
    • https://episcopiaoradiei.ro/files/xogomorizesefadosiperum.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/dewer.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/besej.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/p4va6rccpqh4ne09cup1fk7tea/25141545594.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/jelirigaxaxe.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/sobowegopimegeloda.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141177fa50c1---wavilezuxivibanaduranedav.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/92788863429.pdfIn PDF document text
    • http://tieclangman.com/Images_upload/files/kogisemowizubu.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/feninavudizuruko.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/80859094732.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/0v5nlhhdmd8raqevsofamvhdt6/63698028654.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161300e677fa5d---guxapoxagowumukaredixaruj.pdfIn PDF document text
    • http://st03.it/userfiles/files/65792283594.pdfIn PDF document text
    • https://dcimx.com/files/30884607753.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/69813822248.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/aee78ca1f85055b9818f6bb7e812eb1a/pazoxovov.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/nagulamuti.pdfIn PDF document text
    • https://www.food-equipment-store.com/fckeditor/uploads/file/81425754679.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/gekaluzamitoru.pdfIn PDF document text
    • https://successalpha.team/upload/files/nudirasonamiro.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/l448pf8n61fkrqp10i8l19tq95/zumuzazulinujali.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/7748591661.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/vekamigugub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=purple+android+wallpaperPDF 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_off0000ce1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1F 10308 bytes
SHA-256: e1f18af0e27bfa664a013d1abccc7989e44460f5862b22b8a876c3d7ac5f20b8
font_01_sfnt_off0000e561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE561 17444 bytes
SHA-256: c1b6a07f86adebd4c9e3bb9ef8a039cc2333b3bf9e7c3922bd0f405a37a531a0
font_02_sfnt_off0001133a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1