Malicious PDF — malware analysis report

Static analysis result for SHA-256 099fed9e49527638…

MALICIOUS

PDF

88.9 KB Created: 2021-08-13 18:19:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: f2c081d058cc98bd31d99231b8ab4975 SHA-1: eba26227feddb27eb9a826d3642e9e432cd1b754 SHA-256: 099fed9e49527638b40ef88c9abcab378ae8f823ba9b75dc8e6afbcd5b07d78b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress sites and other domains, suggesting an attempt to redirect users to malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 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
  • 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://kurpinar.com/img/userfiles/files/nosonevodizatidi.pdf In PDF document text
    • http://szwygs.com/upload/puwitegokalotat.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210620_733EC357056C5E89.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/44prmr3pknjnihu3ekf3ajdpkd/17357748443.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/39698628452.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/78445175873.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/65458973920.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/sifos.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef60eada10---56080235520.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/30920750887.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/7100285341.pdfIn PDF document text
    • https://amblamy.ee/upload/file/sowobutobupidapukuw.pdfIn PDF document text
    • http://berbun.com/user_img/file/muwibe.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/getotumowegudu.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/konumefixadakaletigoxa.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/ludurolem.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/mvm8gakojpkgs02j1ff1lm7l2i/vawowidiwetigegafigad.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/57720553443.pdfIn PDF document text
    • https://esz.jp/img/editor/files/58567083622.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089b25a39f35---muritedesijakizamevi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108dea740c03---50715726123.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/kjr5hsru33u3nbth7m9d8uujof/pitududapevirabu.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3480183e73---42503643719.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=rosario+completo+para+acostar+ni%C3%B1o+diosPDF link annotation
    • http://janyska.home.pl/_mjanyska2013/fotki/file/25433394769.pdfIn PDF document text
    • 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_off0000ee95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE95 10924 bytes
SHA-256: 9143968d6843140c12bb409449829174d0a8effcc2c299ed0fbfa59e117ad8b2
font_01_sfnt_off00010799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10799 21012 bytes
SHA-256: e2006e866639fd788fc9f3980d88ffa43f878242f2a15ca1bec2a95916186098
font_02_sfnt_off00013bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1