Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fb119822c558abc…

MALICIOUS

PDF

86.5 KB Created: 2021-09-12 06:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 88790d5be4dbe1e1174024922169c0bb SHA-1: 01698609d2e80321584622e8c85f369cb1fd5933 SHA-256: 4fb119822c558abc09342f6373ccc87dbbf250d4981f17a3740208b093ac4bab
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDF documents. It also features a link farm pointing to multiple disposable domains and compromised WordPress uploads, indicating an attempt to obscure the final malicious destination. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature, likely involving phishing lures.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4584

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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.oe.com.tw/ezadmin/ckfinder/userfiles/files/vilujoronotase.pdf In PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/bd6f3aea990558190871662e8821b7a8/gavamakexawu.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/dazowug.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/333375b0920058a8a05eceddd5800eb9/74999691175.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/36586404655.pdfIn PDF document text
    • http://ducthanggroup.com/webroot/img/files/vanowenetipofexuburepabu.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/javokajixopug.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210908180854104.pdfIn PDF document text
    • http://deltools.com/userfiles/file/vofuvemevananenomete.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/pamakewejimezufekusotax.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc1f9dbf39---58703127211.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/54231777734.pdfIn PDF document text
    • http://sjccgy.com/userfiles/file/fukujubegikejuk.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcfce08095---jozoxabujifojoxo.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/lolewozubera.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/sanopukuxaruzemita.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/punibizatadugirepusoja.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/runadasaxi.pdfIn PDF document text
    • http://ttc-investco.com/img/files/69604531453.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/28925354703.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/fubapijox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=demon+slayer+movie+online+full+moviePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11851 10560 bytes
SHA-256: 058399ea7bf986a0a408adb33aad9209335ea913509a68db22e2586b4e763b20
font_01_sfnt_off00013067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13067 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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