Malicious PDF — malware analysis report

Static analysis result for SHA-256 618ca73b105c59f2…

MALICIOUS

PDF

75.8 KB Created: 2021-09-19 06:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0cd881c18dbd41caa8566d468d07e4b7 SHA-1: 729e1938981f01ff0c76a977d46911627945a5ad SHA-256: 618ca73b105c59f2c2dfb9aa1ec6c84ab76aeab65d9c12e5ef82009208a743bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable domains. The presence of external URIs and the nature of the link farm suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dpsnowodworze.pl/userfiles/file/mavubujukomemogeludig.pdf In PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/78301836545.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/nufudadawigurenopib.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/lenitemuzubitozoxuwagegot.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/vuzujijebijutikolunuk.pdfIn PDF document text
    • https://sainaudit.mn/File/vowodesajoze.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109062018197505.pdfIn PDF document text
    • https://hoya.mobioptika.hr/UserFiles/file/doxizaneberenuvinuzawugux.pdfIn PDF document text
    • http://otpetye.com/images/shared/file/70046635177.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613adab455c4f---51618079593.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/95313892289.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16138accbeafb7---xukulofukeretamidubutug.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/73124154301.pdfIn PDF document text
    • http://elsped.hu/files/file/gavaxe.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/fuxolokawujuwapapegiziki.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/pokaxumuzora.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/l2r0i01ljqdnfv5jbgojvfhmn1/73318252250.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/vufok.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/95324174392.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/90252737344.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/39941058397.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/wofarew.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/bijiwez.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/90587080596.pdfIn PDF document text
    • https://2winit.com/Files/files/554778092.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/88998531843.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/95831907050.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=pokemon+go+spoof+pcPDF 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_off0000c4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4BF 17808 bytes
SHA-256: 97ad93d2ae27d5748f4ab609b33d1ab05df45e6383bbbd12e9cf39b3d0f17e1d
font_01_sfnt_off0000f23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23C 10416 bytes
SHA-256: 4e36a5848e51151c9a85818bf7b678fc800789c7758fa675da66046b68a61135
font_02_sfnt_off000109e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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