Malicious PDF — malware analysis report

Static analysis result for SHA-256 d10a9c7b50747bed…

MALICIOUS

PDF

100.9 KB Created: 2021-07-14 09:14:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 54d5661b701038cfe6190bd4a9376d3c SHA-1: baddd9cf14512054d58e13e728e03c1f6efcba7a SHA-256: d10a9c7b50747bedb4e24c854355048e10d9ed296bcd5351f0d2f76dc385560b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, likely to manipulate search engine results or redirect users to phishing pages. The presence of embedded URLs and the nature of the heuristics suggest it's designed to lure users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9803

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=island+of+misfit+toys+jack+in+the+box PDF link annotation
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/gli0s43hb5jit7030a4hodub40/60397555188.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5d90a42b---29945058146.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/32594896789.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/bopezu.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/155630521.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c246715ef3f---fakax.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/61069259553.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608903a6d416d---92332700132.pdfIn PDF document text
    • http://gptools.net/userfiles/file/92859214615.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c26e8acb753---45070477572.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15bf7abd2b---82936495535.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/70236316354.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/7e722bb47df49070070d7f47361f8876/64321332868.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160977eacc14a2---kudusesasewifiz.pdfIn PDF document text
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/62564883713.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1910d4ac7---81906426889.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cae62f934ba---totowaselupenuneripa.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/c292dc25eab9909a3e1dc4e132014708/84021686299.pdfIn PDF document text
    • https://soechi.net/userfiles/file/48800091520.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/9499638317.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef6001641f---60851335322.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/bogidalad.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704c13046e9---jirut.pdfIn PDF document text
    • https://isosklo.cz./uploads/wogumalawinunisamesobax.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/kizonipaxikewijawemiju.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/11161537013.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_off0001258d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1258D 11168 bytes
SHA-256: 34c126eb3c23a715c2c98e95a9530b10f93c51b3ae4091e29943d0f2769ce02d
font_01_sfnt_off00013f74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15786 17740 bytes
SHA-256: f3cbff6d62c18aeea6c3c6d79a275ba61795176e827cd9b5121544d3807dd820

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