Malicious PDF — malware analysis report

Static analysis result for SHA-256 92e4a06bf5a58270…

MALICIOUS

PDF

81.6 KB Created: 2021-09-08 15:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9ed9c75f31720e5c28eff9377d958dc1 SHA-1: e7f758f5fe09df2ad7c4daf441ae1c1f523c054f SHA-256: 92e4a06bf5a582707460a8b9c8a21739109049701abea0a7182dcb95aa85dd37
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting an attempt to host and distribute further malicious content. The presence of embedded URLs indicates a likely intent to redirect the user to external malicious sites for payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/91974279f0ce521715d67ee16d9a88b6/lujexosegigexo.pdf In PDF document text
    • http://7sate.com/filespath/files/20210907212442.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/82244278039.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380ca3b9225---sinefugevesire.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/89457061758.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/wabitewaw.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/37446486871.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/xulatokib.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/98610115800.pdfIn PDF document text
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/vololejerejetesenufi.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613434ad7f4f8---10215143285.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/75843780525.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/ripasajakofuwi.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/50682524490.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210902190714.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/29861155030.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/94647311565.pdfIn PDF document text
    • http://salt17.com/userfiles/files/zifafisadofomelisaki.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/ojg7um85u4q42lpif637lpei42/61499309553.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/kolapivugopiziras.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/34601219034.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/suvunutufa.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/falatujilev.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210908_87DBB0D7EBCB6683.pdfIn PDF document text
    • http://retailcop.ca/files/juzafowugodup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=the+maltese+falcon+dashiell+hammett+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_off0000d900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD900 17960 bytes
SHA-256: bfb41efd4d669871ccc2426360385c88bd6a7c92902f9df30639a11ab557ae5c
font_01_sfnt_off000107af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AF 10748 bytes
SHA-256: b153f91077da92a8c1c3a5f59a31b49f5dad37dd7fc000aa7e745dd270113960
font_02_sfnt_off00012034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12034 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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