Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cd6fdb6a0ee9632…

MALICIOUS

PDF

72.4 KB Created: 2021-09-14 13:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d230d307b09a77d2c5f4d13ce9941c4a SHA-1: 2e7ce0e096afe4be2d58ee5fbf665f7f29871657 SHA-256: 8cd6fdb6a0ee96328fcb07e4c0903f0916bcb60280b9472527a55fe5979aaef3
164 Risk Score

Malware Insights

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

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm designed to redirect users, with one URL specifically mentioning a game download, suggesting a lure for malicious downloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://crewmak.ru/uplcv?utm_term=brian+lara+international+cricket+2005+download+for+android PDF link annotation
    • http://redigonda.it/userfiles/files/monepa.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202109102104196664.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/bebilabeza.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/kinikilajubi.pdfIn PDF document text
    • http://hodori247.com/uploads/files/41118641610.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/kuvusu.pdfIn PDF document text
    • http://iwayman.com/uploadfiles/file/210914021724742781tuja1k.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/13550998161.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/49352535017.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/50823282229.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/40219829137.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/72020053765.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/wixufa.pdfIn PDF document text
    • https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/5186701759.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132d757215b9---10439543137.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1613f337631e5f---kivedusubukonemogev.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/kepisetevajitoz.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e351bb8eea---38342123033.pdfIn PDF document text
    • http://websurin.net/UserFiles/File/wegivinefevovagiw.pdfIn PDF document text
    • https://xistenze.nagydavid.com/files/files/69627985180.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/36008122034.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_off0000b831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB831 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD048 10908 bytes
SHA-256: 29d0114e83b43a53b2846b510d900219ef16a5fb98c67d1ebd10de26efa0f2f9
font_02_sfnt_off0000e9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CF 16160 bytes
SHA-256: ecda9ffb4cea0509756ef113ec741bd68d6a991e7733e347c02fe8fe5eb4274c