Malicious PDF — malware analysis report

Static analysis result for SHA-256 58d8eab7799bcda8…

MALICIOUS

PDF

73.8 KB Created: 2021-06-14 13:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: c9f2cd4149495eec6aed836fb9abd719 SHA-1: 6421e47f6f36d5e7fb39b4c8bd77dd8ffc82f3a6 SHA-256: 58d8eab7799bcda80dfa61691596f02af0090ff233cecba3d5b35dee85d6042b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to 'let me love u mp3 song' and 'wkhtmltopdf', indicating a lure to download content. The presence of external URIs and link farms points towards the document's primary function being to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://garglob.ru/uplcv?utm_term=let+me+love+u+mp3+song PDF link annotation
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607696aecf564---23689582099.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/vc4cu7rmuvs3v22h5qqpudqvm0/1566663119.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/bokobalebefasos.pdfIn PDF document text
    • http://apsons.eu/files/file/34346066747.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/191c8561d9e774df9fbc7439148f0224/kobupowidavoxononixaki.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/bamutelopufudew.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/43849501137.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/0c424baff2b4c7872fc07c0f5acdd760/65286405125.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca1b9c993e---94157242060.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/b20acc4a2c87da5ff8620b5556c794b9/mizimawakanobakekematatov.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/xudapipi.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606e1c4ddc108---3842655346.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/c7cb414730ebbce0e64fdaf0e76e54fa/67620306287.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/livuwipa.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/0b80e60def5b642d07a105fe54fbbbb2/tuzasekevofatukizavi.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1607aeef7255fd---62877353604.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/d7648828024bdef36ee3beda1c7b26af/damolagek.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c36e624e6---37595151826.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/14cffbe33bd1b61c3dafb13577bd822d/38359211549.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e38e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38E 4996 bytes
SHA-256: e9c8ced026646887716ee643b078000aec8c07c569bed59d7cb765df689da825
font_01_sfnt_off0000f493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF493 11124 bytes
SHA-256: 238fae6d9c965e9d4f4c89a14087a76c1521d2b820b7af297569b330fc4b0601