Malicious PDF — malware analysis report

Static analysis result for SHA-256 557487563c37e15f…

MALICIOUS

PDF

82.2 KB Created: 2021-09-06 22:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: db25b8b6f890db37f2c106176cf9c7b8 SHA-1: 14d1ec4fa97552c288a5efe74b1cc42334c7cbc9 SHA-256: 557487563c37e15fc13c56c9f5ad74071c1f3b593a99cf324966ecf7cf64f101
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and the nature of the heuristics indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/pmj9c7vmhsk9paluhtovhgc9ca/venoxegubikage.pdf In PDF document text
    • https://baohohoanglong.com/userfiles/file/67877497202.pdfIn PDF document text
    • http://elm3rad.com/file/72475279248.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/werezelinoxafozitave.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/3326858532.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/68394311895.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/74421364124.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/7724a2b91674906dcf534540dcbf3055/78216466943.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0dca80889---javetorafozexoxi.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/nazosapirajo.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/g41dkb7agtrqjqc82t3jcustdr/59577519461.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210815_24E59D10B2A1455A.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/retuw.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0291e798a---40735157033.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/kexosasewaw.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/een13su28l8puvmp6lop79q6r5/17676017757.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/95f3d1d71bf26177ae23f581c9eae880/wakipuvajikodivonikiz.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/67638970553.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/dezilusabe.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/7cda3007a50f4224efccc0a19e4c320c/bajupotumoz.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/34494985432.pdfIn PDF document text
    • https://dalyanestate.com/userfiles/file/sepebulesimivo.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210626185028.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=escola+naval+2020+prova+pdfPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD937 10584 bytes
SHA-256: 8c46d7c42bd870b00eff482c3a6832e14723721d7a48f9dc99cb978e05adca98
font_01_sfnt_off0000f189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF189 19120 bytes
SHA-256: 6dacc5ac37ce4162a850bdcadcae6f9937f8c28994c77fd4613d2393eadf0d25
font_02_sfnt_off000122f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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