Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e99c2bbca6c30dd…

MALICIOUS

PDF

100.3 KB Created: 2021-07-13 22:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 37eaa97b38412f0d32a307110fa43961 SHA-1: 73082495f12bdc157a700b287c22f659a6659a36 SHA-256: 3e99c2bbca6c30dd47619d0416080531ac4f930624964c27b4c6d7dc48205cde
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous distinct hosts, many of which are either compromised CMS uploads or hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic findings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 http://kleinschaden.expert/userfiles/file/foxojozogiwetetutid.pdf In PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078d9901caf0---figorenududetufetumiro.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/lojq22rv63makt24pum22sud8j/wagufifepizeni.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/23691440468.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d09b463f8---denok.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097284a306b3---87619753444.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/d0e8e3884ebc2864500c00182f155c50/15003965359.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/unlnid1m45jkrd9570qdv78j46/nozolisopozugujop.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c8744e97ad0---bamonake.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/tm23759sb6rd8t3jkied73dnop/vajexopikesekisuvejexetow.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/06d36345e721c8fd42c58d8ff79a2e0c/kobiz.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edb2e792a0a---83879316367.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/gapowunobetu.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210701180754.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/67317151590.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16077153f2b15e---27336104276.pdfIn PDF document text
    • http://allycatering.com/userfiles/15864978419.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/jebuxafuwuboverim.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e944abf2620---88269945606.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3ac74c3cd---60354290342.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/vefomoderunizunut.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7a33cb98a---50885648023.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5991b34881---53049358255.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/nusixapoluvoken.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=cons+of+agriculturePDF 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_off000129fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129FB 10644 bytes
SHA-256: c8a56df5db53ec3731a64ca9862097c4f7600d4af0121b4da3fc566453a5908a
font_01_sfnt_off00014287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14287 16208 bytes
SHA-256: fd3e77ea28d3704c536bf43b2256516326b76e583f8fbe9bb93adb5430888e69
font_02_sfnt_off00016c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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