Malicious PDF — malware analysis report

Static analysis result for SHA-256 377725cffc40590b…

MALICIOUS

PDF

59.8 KB Created: 2021-09-30 11:38:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ec87aeaaec303e555c4e767ef7038a25 SHA-1: 8f607c693ad091454a0f5cc4f71c296d50b83f51 SHA-256: 377725cffc40590ba83ec5fd4352ce35093700dca58a40b220900e4eb96d076b
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users to malicious sites. The numerous external URIs, many hosted on compromised WordPress sites or disposable domains, indicate a link farm designed to obscure the ultimate destination, likely a phishing or malware distribution page. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4971

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 https://irlanc.ru/uplcv?utm_term=how+to+transfer+files+android+to+mac PDF link annotation
    • https://ymy-tea.tw/upload/files/rafeforemukuwilubimi.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/1e20d5abc8523086775f590eb0b89ef3/voxetutoxapetokef.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/zaredodu.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/13822892475.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/a02f62bd1d7ef6067c0fcdbf26544402/40569017568.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/senegoja.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/78938687488.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/31015580614.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141d52b50dda---83091424930.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/61096550070.pdfIn PDF document text
    • https://mbbs.hr/files/fozirixakom.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/gepevawunirabewenagoxuxeb.pdfIn PDF document text
    • http://erimti.com/userfiles/file/zemubutodusotofupos.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/salinas.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/70672385455.pdfIn PDF document text
    • http://kunbot.com/upload/files/95421440262.pdfIn PDF document text
    • https://heureka-cz.eu/files/1694259922.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/lugekaman.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/wugavezegarisonupaxo.pdfIn PDF document text
    • http://synhbio.com/upload/files/64381698958.pdfIn PDF document text
    • http://njchemland.com/upload/files/pusoxinelari.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/pululamulutamiwimimapota.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/44725112937.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/hd9i75j50rgc3svvue2b9d9nuq/supowituw.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8258dc563---vokesigedezazag.pdfIn PDF document text
    • 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_off0000bb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD318 10712 bytes
SHA-256: bef51aacb1bb7bd5f650db1059c63048818aa421f23bb33d0a451148cb906463

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