Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9a2a52345888675…

MALICIOUS

PDF

67.6 KB Created: 2021-06-11 13:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f5fa1f923efeb3e953e03275906d7f63 SHA-1: 8ea7f675ea43f5fed033f00c13c9a90b6ae8666d SHA-256: a9a2a5234588867549a98c54977943fe604d502fe3174be47695fd511df25413
156 Risk Score

Malware Insights

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

This PDF document contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The document body text and embedded URLs indicate a pretext of providing an online converter tool, likely to deceive users into clicking malicious links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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://pistant.ru/uplcv?utm_term=dng+to+lrtemplate+converter+online PDF link annotation
    • http://aeronautike.com/userfiles/file/24533342183.pdfIn PDF document text
    • http://coxfamilyreunions.com/clients/5/56/566bc9ad745482f371977770c3e6b383/File/nuwome.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/r7508evbsh4hpnkvboq3tm006g/73453551688.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/633f4d396059b391409feff7a5d74089/posaburebimesab.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/g53gd9pv551scvo8dsbs97cpdd/19848627215.pdfIn PDF document text
    • http://vizcsap.hu/files/file/37534213224.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/d0cd74bdc885a93ab003f2f22264791f/wiganezigu.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/74241894507.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b62b87b4992---puribowusigan.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079222053e3f---49014920876.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae26bdbf4c5---losiduwobif.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a04f8e4fb3---61259760256.pdfIn PDF document text
    • http://amandamaitland.com/images/file/gibul.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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_off0000be17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE17 4924 bytes
SHA-256: ccdd87979569ae1ac8fc3812c9deeb6afd6697ff968249e24d0c312a87942873
font_01_sfnt_off0000cebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBF 11144 bytes
SHA-256: 09942e22140feb2f9bab39ee2ad33ade79122f507e17d5f56b694bb11212b766
font_02_sfnt_off0000f2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E0 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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