Malicious PDF — malware analysis report

Static analysis result for SHA-256 5691e32bb1b11504…

MALICIOUS

PDF

79.0 KB Created: 2021-06-29 06:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3e564dadb4caa7d58a3d096fc2f5a792 SHA-1: 6b838af8ec2856d17cbcafb0f1c47a0a61c1faea SHA-256: 5691e32bb1b115042bb38e6f12f2a1b54ccebdd1d066b3d7e193cf0a92126702
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, presenting numerous URLs that likely lead to phishing pages or further malware downloads. The presence of external URIs and link farms on compromised CMS uploads suggests a distribution mechanism aimed at tricking users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://queure.ru/uplcv?utm_term=motivation+letter+free+template
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/9274fa9eb531772d728890a7c6f8b6c8/35590004673.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/srvpuniq8i6addm71gi63h6aeg/656125220.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f58fa9b407---tadiruliguvozofuzinuwujez.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/66721e807f756a17b0658228c88a8a2d/11110814698.pdf
    • http://el-master.ru/userfiles/file/pupojiwavimokazibodimif.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9c4d5c321---40041677541.pdf
    • http://riversedgefm.com/files/file/tafigadajubutavebibegot.pdf
    • http://chronocertif.com/userfiles/file/buvexapit.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160747c112fc14---42063796358.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e578c3797---13022059539.pdf
    • https://healthmatters.me/userfiles/file/pufisevewego.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160757c6d804b5---kujofejabonugonuwotudopu.pdf
    • https://observatoire-omic.org/documents/file/gozet.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16073cc65d34af---87857583793.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/d1e47ae056ca7ba1ccb23039db25cae0/5499764798.pdf
    • http://viprealestatebrokers.com/userfiles/files/zarerazol.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bff29f24e4e---jixawonuzonurus.pdf
    • http://indago-rovigo.it/userfiles/files/38415718031.pdf
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/11b61c739ee86d2dc3a8d955e784df12/83707925916.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/7d32935d33348f490b920d6c039594c2/kogazixisumizovopifa.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/rmqf6j6l63sqma8uvdtuiqb2eb/91559367243.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/v64dllc016qlq4l2cteafkmtrc/97366432524.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/69bab2ca7100b940fbe152320a1db422/56968564757.pdf
    • https://melz-feu.ru/upload/kalotibaso.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47f02c81ec---35734069826.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d275.bin
79173a3ead20f71edf03cc5a501172032333d559b42eb47fa1d28c37f7810f54
pdf-font-stream PDF embedded font (sfnt) at offset 0xD275 17260 bytes
font_01_sfnt_off0000ff2c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2C 16792 bytes
font_02_sfnt_off00011743.bin
5e056ba218b54f8826448a39e44bdb48ae87c74a837d4e864c79cf9f12ead3e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x11743 10408 bytes