Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a57e68124507b2f…

MALICIOUS

PDF

80.6 KB Created: 2021-09-20 01:27:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 96fecef13f9e86eb6359bf31d790aa19 SHA-1: 357854efa4be4079f3c008eabec89e48e2a55151 SHA-256: 8a57e68124507b2f298b41b38156ea83f1dcf07ef250191e8d75cdbc25a8d6df
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm for SEO manipulation or to distribute further malicious content. ClamAV detected this as a phishing trojan, and ML classifiers also flagged it as malicious. The presence of external URIs and compromised CMS upload links indicates a potential for malicious redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://accessibilite-salle-eau.com/ckfinder/userfiles/files/miwepukemapolom.pdf In PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/dawokisetalutanenonupik.pdfIn PDF document text
    • http://lrpharmaceutical.com/upload/files/kunew.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/xuvimobevugalatotato.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/mejagimutunadewozipimazal.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/59091805181.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/ee92aa902f52ac8b695d441227ab32bf/lufud.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/wamewirorebupurejusu.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/48142182016.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/b7a2b6aa1c900aa3f8c2415ca3402488/71352505665.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/68260190447.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/54665497590.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16132584b70ff5---zevomazeziti.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/famumiraj.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/javomatirepeviwil.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/67213164933.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338a155713a---budepodidetepefawarixa.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/mdo8fhap6l51tcv38ss3d484hp/8017089910.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dowiwikutizumiz.pdfIn PDF document text
    • http://adice-area.com/pictures/files/88386032612.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/15249179957.pdfIn PDF document text
    • http://generoussecurity.com/uploads/dugezusalixateg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=74ls04+hex+inverter+gates+datasheet+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_off0000d51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED30 17760 bytes
SHA-256: 1532d8f64e7f270b335a36babb601d9564eb9e121d000ce279961d7d31fe3f67
font_02_sfnt_off00011b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B41 10980 bytes
SHA-256: 9c6a699309a38f93430c2522df0cda245b2ab01b230f4557b457d3d059ee3a6c

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