Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ec92413da537859…

MALICIOUS

PDF

63.5 KB Created: 2021-06-22 12:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: b73f21184788a84b0091fc6a4f34b99a SHA-1: 1cf83f88958e5cc370882803c7a184b73b4131b7 SHA-256: 7ec92413da537859c7b56ea57b672c43f0e461d6515ad265d18e8ade13d1570b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded URLs are sufficient evidence of a malicious campaign.

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://crysiq.ru/uplcv?utm_term=english+grammar+test+multiple+choice+pdf PDF link annotation
    • http://shinies.ru/img/lib/file/gitekatuzekojunedatis.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/luvudijuzijowukep.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d22da6b262---38649877162.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/gb4glfgcdpe70rhsh5n8ajit57/kisumevonokevubom.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210619183622_124538535.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/554a75ae3cc4bb84055b1ded916fa2b8/86009087939.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/xisewarusupizekemaniw.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8f307a8be---58750628130.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16228251021227494667.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/66910782148.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c35fdadf1---40440836474.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/3411b6a9b4d405f4d24f1f2ff11f2089/63367112990.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cdef02d092f---gapuzixiwugefaziko.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/vegorefazologedat.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/defuzedeniberoditolol.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/8229634597.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_off0000ba45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA45 5524 bytes
SHA-256: cac7b9e417bb6eeedf850bfd1d2927ae01236278ddd6fb3f761b2bd8c3afbdac
font_01_sfnt_off0000ccea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEA 10656 bytes
SHA-256: b95ced3b4dc1e507c3b8bb21565f07f9c137970667b7731f90af3c199ad7e474

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