Malicious PDF — malware analysis report

Static analysis result for SHA-256 4232a6c1375c0c0d…

MALICIOUS

PDF

96.5 KB Created: 2021-07-31 12:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f71c82d749dff8e40d34489f3fb7cce1 SHA-1: 8bc45fcdd29b0d3d03098bc32e2152a47b25c091 SHA-256: 4232a6c1375c0c0de089b28197c11a913ef698aed0a3559ed83f26766006658b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, many of which point to compromised WordPress sites hosting other PDF files. This behavior is indicative of a link farm used to distribute malicious content or phish for information. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • 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://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/eb2366df7d1ab57f77583d0f130a8e86/saxenetixotomivafegi.pdf In PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/gjo1bv1i5b0ql0c4uutaqcmhql/roliduwagebisozubaxodin.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/b7d8781dd788e10c3381a21932da7430/25132660364.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8617f6ac76---pipesejegofafofuv.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/8871f5f0f53a068678be2590d3b1e9ab/31339763142.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/f0cad57cff3f19d03e46b2f42c49dc9b/zujujipuxerogimel.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b40bffb5689---97164020595.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/kosisexobotazarosuruw.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///vabixoviguwutotazumawokis.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608187ba2eb94---39677516681.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/vejosujalafasenukutolukuf.pdfIn PDF document text
    • https://amblamy.ee/upload/file/ponosojixedukelupupibero.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/8bqbc4b0ann7ufk7rbl2eooq5e/xizenabozuvutixeje.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23284d2e0a---47120749907.pdfIn PDF document text
    • http://takemehometomatoes.com/ckfinder/userfiles/files/savozinusiworixojosi.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/5f003e0844176f9c9df7b9af130ae6fe/sojowubazugu.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160be19782da35---83568908900.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/sigidizano.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/ronafomofisunudibe.pdfIn PDF document text
    • http://lroundup.com/clients/d/d7/d7466da0ad72d96b64793f89c518a0d9/File/panisaxazinimebesu.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/lavibozifexuwulaxanu.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b9edd69d0---vunapefezadozoravizezak.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4103ed4bb9c476856b855ffcd679449b/mukuvag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+do+you+program+a+universal+rca+remote+controlPDF 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_off00011370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11370 11212 bytes
SHA-256: 5ab164c02b3616d0f7e012dd0d818ca1e626c9fb5115b6b1cdb2b1dee661b4a8
font_01_sfnt_off00012d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7E 17280 bytes
SHA-256: bf87a298fd7442093e7d46b8fe08fbcc284692efed8c80c1b63c09be0ce3f26b
font_02_sfnt_off00015a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1