Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5a94b8129a02029…

MALICIOUS

PDF

78.4 KB Created: 2021-09-14 02:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: edd645fca3e5670dd5c74bea2725d736 SHA-1: 92dde66cee24bfeb6ff31257be86e88bb09d00ce SHA-256: d5a94b8129a02029c8fa6ef5850c8cb577e533ffae494a9bc965d3f74a848fc8
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The presence of external URIs and link farm heuristics points to a tactic of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://queure.ru/uplcv?utm_term=pokemon+conquest+download+rom PDF link annotation
    • http://we-women.de/default/files/uploads/file/87961211986.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/tiladusavejazura.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/28737259518.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/telalanogexatis.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/80575582339.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/tofojafefanugure.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/bibanemeruguzuramoxenad.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/22735381016.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327857be84d---93358916493.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/58031061499.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/92186159439.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/62477829053.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/baleforurekamenubum.pdfIn PDF document text
    • http://erimti.com/userfiles/file/tezif.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/rolovalitufidodudofa.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/28848303532.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/bigegobipewaz.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/waxavenefof.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/k8qmrch534efdbhpc64jba6ib6/67295310615.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/35953215845.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/dubefalusofudujinitojuf.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/99498206869.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/soguzovawosexibatowini.pdfIn PDF document text
    • http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/sipukadomonosoforem.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/82b1ef06873b3ef5366dea0633dc51de/pasojefibelimir.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_off0000cd33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD33 17816 bytes
SHA-256: 6e7c6a7ffab2815313b40cb6c43390dc8b1cbc908b27b3727dd0b4961a60e266
font_01_sfnt_off0000fb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11334 10864 bytes
SHA-256: b88e513ddd1784c46e71d2fd5443c15902677fecdd74be7881d111bdde4dec47