Malicious PDF — malware analysis report

Static analysis result for SHA-256 56d434163d95d5ea…

MALICIOUS

PDF

98.1 KB Created: 2021-06-28 15:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ecaef128ccc33a5fa4271e19d853a5ad SHA-1: ba5174035292812cc1f1d214e5f0566634cb542a SHA-256: 56d434163d95d5ea48f45f03fd5bcf790e6596713ef7f8655f12bb6d9f3ca8e5
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. The document contains numerous links, many hosted on compromised WordPress sites, which likely serve as a link farm to direct users to malicious content. The presence of these links and the detection by security tools strongly suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a4fa6b5e9---62994788332.pdf In PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/5bee003d4378ff155a0aab13aa5bc034/kuremekisoniloluzudipeb.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/6tspi7sdmeb84ksi7d693mdpmu/kovoberugarutiwezexekajo.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/nofudoludu.pdfIn PDF document text
    • http://temple.mo/userfiles/file/mutojifomuxagovu.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/8df63526dba1c3da8341493c5c5abffb/85314185736.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a692dde2bb1---67664315546.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///29607992837.pdfIn PDF document text
    • https://kar360.com/resimler/files/safogajef.pdfIn PDF document text
    • http://faradbox.pl/files/file/nofatesutola.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082bcdd7d659---44047038394.pdfIn PDF document text
    • http://wamer.org/userfiles/file/zamevifuf.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d61d5ebc2---15223111335.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/fb259431dea272e43a8eab0a5da15dec/45522480826.pdfIn PDF document text
    • http://ruresept.ru/files/file/bilavedutokepukude.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/u10t8fi5octnsptl2umingigp9/sonoveneguwoponewutan.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/4bda52148707b9d9cb847ab0b7b65b36/48320599288.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/rujajanekewasidekepuwares.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e26334a45---90801298447.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df09c9f661---niwudugapadupikijumipufar.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/wazomonavuviwovagazabitix.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607252b192d72---durixajajevovu.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/24418846068.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/6f83e4d55c7ed571514f664a126ae05b/18058492127.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/98799027883.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=real+comet+on+earthPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10458 18132 bytes
SHA-256: 9dc708b98b46c34010ea229370af93298f723390fdafaff8c63cf6c8b9fc8604
font_01_sfnt_off00013319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13319 16944 bytes
SHA-256: 691e517c213823b3b70cdb1a2a958c7968597e27cd7000701d0e828367d699f7
font_02_sfnt_off00014bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000163eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163EB 10280 bytes
SHA-256: 0aa79c1dd5ac758dabe05eba63864003370c722fdd77eef17227e2966c738a52