Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a8914b60ef648c2…

MALICIOUS

PDF

82.6 KB Created: 2021-09-19 06:18:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6a21a955ad97e7f1a32cdeb22b694671 SHA-1: aab0c00d5a1f4525ace88a8f4e3414075707f006 SHA-256: 0a8914b60ef648c26f74e4092e21580ff0ee6f287483f301840997aa5814d12f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.advokat.com/app/webroot/img/fck/file/sisewufakokirir.pdf In PDF document text
    • https://girisimhaber.com/uploads/file/nomorowewa.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/vogonexurobejo.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/xebobutobafizirifimim.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/begibet.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131d59fc5e48---molel.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/gefaxosufaru.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f03e40132d---lunubisi.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/pamusadevup.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/21048165079.pdfIn PDF document text
    • https://cityface.cz/res/file/88170693054.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/61904530283.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/68739798719.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/fukubilawawejomawuxuxof.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d84044cb8c---77268075290.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/fexupot.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/30903871275.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/pazosemobutulex.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/gebokateb.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/gomob.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/32249517504.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=le+meilleur+economiseur+de+batterie+androidPDF 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_off0000da70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA70 18932 bytes
SHA-256: 3e3036e6589daa9af34e94b07aac0d72d2f3c6be4e6ff4b9f2bddcc02a47abce
font_01_sfnt_off000109d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121ED 10728 bytes
SHA-256: 1ffb4c46e4f81019e830d96d7dd51a3454176595768706f0f781b0c269b4d077