Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd4ba538438a28f2…

MALICIOUS

PDF

80.7 KB Created: 2021-06-21 01:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: abb378177d10a3dbc3cfbae252d8bb6c SHA-1: 092a3ea87405f02d41ea6c6ea33b69daef578ec1 SHA-256: bd4ba538438a28f231e507a6add129db966ee7a0fcea4195d5b05a589604ce60
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The presence of 'utm_term' parameters in some URLs suggests a phishing or SEO poisoning campaign aimed at directing users to malicious content. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://wastran.ru/uplcv?utm_term=gta+5+ps4+split+screen PDF link annotation
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/5a9b6165aebc3131b1d0ec97ae111ac4/xipuroteno.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b78185cff---tetipidemisonogoribulevi.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/kopiwejatuvewipixawomub.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e50e2da65b---20576178269.pdfIn PDF document text
    • http://lblussana.it/images/file/62457124883.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/d87f485oa25r8j1kd9fq578i61/bebuvilijatobutoduk.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/51824126598.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/43133891787.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4c491542---19925416550.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/aba81ab5ee99c67b4f53547c4d0a9c02/kijujimolomowijenugej.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/bopedimudadipel.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fb02690fa3c27f99bb074b10617cc4a1/sigulisekemulat.pdfIn PDF document text
    • https://drsaman.com/files/93573257985.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/d9fa66cb809a5aab686822865ec4af41/xifutinop.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_off0000ffda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDA 5172 bytes
SHA-256: 48f3be62f397d7c65f9c4d76b6e5380fc94d6458babfbeec1d771424d9d57602
font_01_sfnt_off0001118c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118C 10752 bytes
SHA-256: a7eda08398ca8f614e6f6eaaa93a7b4985d8a56f2edb9d1fde304eeed5e7a535

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