Malicious PDF — malware analysis report

Static analysis result for SHA-256 80c4e03521abee78…

MALICIOUS

PDF

95.2 KB Created: 2021-08-26 09:17:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 6ddf42ad37d570199c53fe8fa0142ca4 SHA-1: 2ea23f0206ab8b6b76f2ec6bd91e97f08ca4690b SHA-256: 80c4e03521abee78026ccdd8b82d7f3e512b764ec8aeab8e178070284a2dce84
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which appear to be compromised or disposable hosting. These links likely serve as a link farm to direct users to malicious content, as indicated by the ClamAV detection and ML classifier flagging this PDF as malicious. The primary attack pattern involves luring users to these external sites, which then likely serve further malicious payloads or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16090caf396928---26732042865.pdf In PDF document text
    • http://coreaad.com/DreamDataUpload/file/makerisideri.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/e285707120d5e3b47fa60aea68c46b06/botivasozalas.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/lotavizubanavubujuw.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/sopasaw.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160908b4849ac0---9815190468.pdfIn PDF document text
    • http://nova-auto.com/upload/jiwunejoforamakenojaw.pdfIn PDF document text
    • https://tekartltd.com/upload/files/kujiwudazalobaxanekosama.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/11445241403.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/666bf23d3c0b1e91f56177014a6c372c/wonedevaxowofa.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609d62299edb9---81565400996.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/8ab2b0d042e6a54bd1947ffc4b0cdc9c/29654977739.pdfIn PDF document text
    • http://cityhigh78.com/clients/2/2d/2ddbae4fb74c169819b3574d76e4e264/File/76090090956.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094763e0909e---kozebupil.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/23771546824.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16072c61d3988e---14745909025.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/jugitusoxofa.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/kazotobudol.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/38368557079.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/67429930884.pdfIn PDF document text
    • http://japhina.com/upload/file/polikusovuzutejom.pdfIn PDF document text
    • http://93564497.com/userfiles/bakidazipudodaxupezutawag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=introduction+to+data+mining+2nd+edition+pdf+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB72 19088 bytes
SHA-256: 96e1e8c935758bdc9dea44cf211c1a729f18e589a3d10c1653ed41c8f6942a2f
font_01_sfnt_off00012d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1E 11052 bytes
SHA-256: 38ba269c10f127f21dabaca70e53922f5c2ddc453a889f7320f400386e016b3c
font_02_sfnt_off000146b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146B7 3924 bytes
SHA-256: 54e893cc8935f95734bb2aedbb5c688ffaa8f459f903939bb8488e4e0f23dbae
font_03_sfnt_off00015587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15587 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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