Malicious PDF — malware analysis report

Static analysis result for SHA-256 43f15267f9a4b7b6…

MALICIOUS

PDF

98.8 KB Created: 2021-10-04 23:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a300acd722b553cd57ab798cc6ff7e46 SHA-1: a092b092d57e47db942a95ecfb9f6a1bd25d7e74 SHA-256: 43f15267f9a4b7b603cdc4ec96206c01411f86211aef9b0385467cfdfd495075
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. Although no scripts were explicitly extracted, the nature of the links and the detection suggest the PDF is designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://paykaaluminiya.ru/ckfinder/userfiles/files/77305673165.pdf In PDF document text
    • http://rld-carbon.ru/file/tusiwetivo.pdfIn PDF document text
    • http://ifap.it/images/file/relidoxuzapobatojutifo.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/161327f435a810---pivetowovelixapilapipum.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410efa7d691---pegujerefikosu.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/bewevuvowivezabetesutori.pdfIn PDF document text
    • http://hengfengpaper.com/filespath/files/20211004162005.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614bc1ecd0a64---xisejuxenalezu.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/3241411556.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146e157dae16---26877811736.pdfIn PDF document text
    • https://beamstraffic.com/amb/userfiles/file/tonigenesazewirom.pdfIn PDF document text
    • http://globalcentral.net/contentupload/fckeditorUploads/organization_/file/pagivelepaba.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16159d53f87b8a---junoziwaxezojuzubikar.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/rozufovamopowigosomo.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/bawedefi.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614bb47b1c88c---mujis.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/sojuluva.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/tarisuvujotiloz.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/fexoputomiw.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/58386550906.pdfIn PDF document text
    • https://inprovitmexico.com/ckfinder/userfiles/files/72084990301.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/38025455615.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210918190816.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/56309459787.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/kapilute.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=xl6+automatic+transmission+typePDF 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_off000113b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B0 22100 bytes
SHA-256: 1b5b3ebb003fae6091192168256c84d273a1ab7f646b3284b55ecf86f3b2a3a0
font_01_sfnt_off00014c0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C0A 10924 bytes
SHA-256: 5d45ca6a60186f7d188dba47482d2254ea443ff1deeced65fd2b7c8b9cbbc367
font_02_sfnt_off00016567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16567 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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