Malicious PDF — malware analysis report

Static analysis result for SHA-256 222033abb5f8f7e8…

MALICIOUS

PDF

83.5 KB Created: 2021-06-09 15:24:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: dd8bd30d84552897b67b5b215c6b33ac SHA-1: b11ee3aa5af65eb9e62064cc920aed17c9a8e92b SHA-256: 222033abb5f8f7e8f9d49c31205ed84acc79f7d99c16a3005ef91d11258aa1f4
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics indicates an attempt to lead users to external, potentially harmful, resources.

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://krisoc.ru/uplcv?utm_term=ielts+practice+test+plus+3+listening+test+3+answers PDF link annotation
    • http://absolutelyneon.com/userfiles/file/gisewogofizilamekobobej.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/10b2a029a14b8caea201373b9623cd39/27762795642.pdfIn PDF document text
    • http://huiking.cn/uploads/file/152245201885.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b235a3af0c3---46013790484.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/jik9ap5ssmok3gg6m4eh0bq13s/13288617864.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb1a3ea259---zujazoriwobaxi.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a71efe18ca---bobogunibukewevotelez.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909f0ebc1df---vufulusofa.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/8768042057.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/21ba17893c0d4397fb36f49dbcb3ef69/wibasixano.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d48545d8f---lotapemeratopasok.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081af6a04681---gaxituvesoditabafub.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/11343775826.pdfIn PDF document text
    • https://bgmediation-flm.com/userfiles/file/wijuwo.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab1593dcd4---98600522362.pdfIn PDF document text
    • http://fondationmonetoile.org/clients/0/0e/0ecfe6182781ff486fe5156d2e85c11d/File/sarojepebuzukazoxer.pdfIn PDF document text
    • http://limitlessillusion.com/wp-content/plugins/super-forms/uploads/php/files/fb2762027d889c0982ee7bca63669447/pujonabesurapomi.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/17892601155.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_off0000f837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF837 3852 bytes
SHA-256: 1511e656a36f17380406cb382c6c00d59522f1eb84571a407058acdec800aaa0
font_01_sfnt_off000105e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E8 5292 bytes
SHA-256: a05866c55ca81fe740da1e3f726c02e10e8d7529dd37f27b23a7ce7c7985559d
font_02_sfnt_off00011807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11807 11540 bytes
SHA-256: 08d4333459e7a9965456802822ca84cfd2f29808b4e33b696302467003f4b4d9

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