Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8cc05b68d8e8374…

MALICIOUS

PDF

86.0 KB Created: 2021-08-13 23:19:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b1f196ec2d8f6f512cb5d2e65988ee31 SHA-1: f27835c28e619e5c1e6a013f2d40cb3c5962df03 SHA-256: f8cc05b68d8e837424cc32bad394f689814cc75fa0705670e71001bcb26bfbcf
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a download button lure and numerous links to external sites, some hosted on compromised CMS uploads, suggests a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics indicate.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://irvinenott.co.uk/ckfinder/userfiles/files/liwuvobu.pdf In PDF document text
    • http://nikolabartakova.cz/files/file/boxelof.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/75491569438.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/bajikanixipozuxativib.pdfIn PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/litejiwipexozer.pdfIn PDF document text
    • http://teraval.cz/res/file/peramesezeduda.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/8mpc38b1niln58q34aummse7ne/dekizijun.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/wituzudalum.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160e9475026e52---91172895918.pdfIn PDF document text
    • http://italiancousins.net/clients/5/54/54f3d33123424807706abe9154268524/File/18564902124.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210520050127197.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/43171197333.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/laraseboxebadoda.pdfIn PDF document text
    • http://pronobile.de/catalog/file/52219193614.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f39d1374fc---75052491132.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/dowabogusewagaxito.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/34909373797.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/94f2d2cf0c1240a7e1fa9883c04ab358/46928044498.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d564447f30---rirupisosizelutobujugoze.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/b577eba1d5138625afb2ea2367e943d4/4542894635.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c39833195---vekorebudukibolas.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad927281415---fuxunukodixon.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/13351764946.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/logelukutal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=eyetv+4+activation+key+macPDF 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_off0000edaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BC 17284 bytes
SHA-256: 184e3caa056ec4e64a420d510e3c32a89f1f8f9f929090fe44f95089f4de6249
font_02_sfnt_off0001331b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1331B 10408 bytes
SHA-256: 3ae7ac18d74099809b68f201f7bcd4750166676265f88fb6b552c8ac91a3c853

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