Malicious PDF — malware analysis report

Static analysis result for SHA-256 a10653cbafd5bb53…

MALICIOUS

PDF

79.9 KB Created: 2021-07-18 05:28:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 23a6739fd410d7ea9cc222fe5a71536b SHA-1: b961625311a7ffe766982d539879ec9820d13278 SHA-256: a10653cbafd5bb53fec12dbdc7bd8848e668a70a31811f01a539dcc939c24ee5
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a large number of external links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content or phishing pages. The document body is heavily obfuscated and unreadable, but the heuristics indicate a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://pphu-joanna.pl/fckpliki/file/joxolonosutope.pdf In PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/9u6i9d0s898tmdkp0r1ko45lbt/tadolomudofuzaxi.pdfIn PDF document text
    • https://tavio.ru/files/file/22175759471.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/visigovazagi.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/902af64b8a6d02761228b76ce0e805d0/51211715536.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094cc08874af---34116822585.pdfIn PDF document text
    • http://makingtheturngolf.com/clients/9/92/925d9bae4ecf380f28dbe0e1390c16eb/File/97396080818.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/52497187562.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/c356f44edb24abfb85917be8b43dddcb/dixinazavewipil.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/thaeq00rvb1ftsou4k3l81mv04/komutil.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/251387a2b3a27e1c9dd169d3d7452e7d/84205968781.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/11001086671.pdfIn PDF document text
    • http://teknis.it/userfiles/files/vovojituxudusixolu.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c01e16541c8---gugobivapipinex.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082f69d9cf1c---saguxiraneve.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2272e900e---zegopesif.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/dogafuzosoroxav.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/veluvelomodajiresatube.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/1eafabedb5016c16fffcd1e77a711b51/vewuloxe.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/quk1t30b26qd4b3jkpp5jq8604/sajopumizosarutivujalu.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c88d1b08af---65322685920.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/visutesuwaxino.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=minecraft+server+how+to+allow+cracked+playersPDF 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_off0000d35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35C 17148 bytes
SHA-256: c1c6141a611ad4569281b42fb91119c4be3c561c2cd8ecb1d5e71f192a2871ba
font_01_sfnt_off00010021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10021 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11838 11068 bytes
SHA-256: 7b095dbb261e3f5c6e2be73481c3aa7cdbd38d9c3e8e5474a264f36f74d96f5d

Open this report in the interactive analyzer, or submit your own file for analysis.