Malicious PDF — malware analysis report

Static analysis result for SHA-256 18e537d7c31b45be…

MALICIOUS

PDF

112.3 KB Created: 2021-06-14 19:25:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 6aa0b7243b8a7116ab87f67c4be0b9a6 SHA-1: d87ff74872bc5a04871ac3a0415abc305fe75ace SHA-256: 18e537d7c31b45be505297c3b095beb13e35477fa08536d0a9522d06a0a50bee
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to infer a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://krisoc.ru/uplcv?utm_term=the+best+character+in+brawlhalla PDF link annotation
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/5cd5285ebd8f7464dbffa3925341ce32/25015191174.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/41803f37a2d59899ec9aecbd4effb728/fonozigokasugisen.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/34919774628.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/4082423986.pdfIn PDF document text
    • http://aweibel.com/Photo/file/82808865402.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/5866504d34b5e7d618c6bec83d6bfcca/jenezajapujemufupowivofa.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094cee921c91---62254881604.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094a37e74bf6---3881153528.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9287d56ea---sugubew.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a321243b58a---4568610203.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/aa709610237d56d851e92f5eb137d742/29468158414.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/o3fag63odcud42asgte4ehq293/pimibebawesawomoniluzevob.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/zijagowanu.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/dj2het0q6bseg36521n8q277v6/96299185695.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c745037144c---danunego.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/81g4resij2dp3hahqqhv6phi4k/60863318564.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/bixugogetifef.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012e21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E21 23728 bytes
SHA-256: d5b55d4755c647e1b78f3d77a7d2324ff2defa5b58a214c6864df1e517647c29
font_01_sfnt_off00017887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17887 5068 bytes
SHA-256: 42b246f091bcf55f071bc64cad3b14d33f87da9a9ce55cf6883026bd4e2969a6
font_02_sfnt_off000189ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189CE 12912 bytes
SHA-256: 65e97c0814ac0b2401ea57445a86eecca639f6d8aecf921fa958e18751f3a153