Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cafeebb06f02b91…

MALICIOUS

PDF

84.3 KB Created: 2021-07-21 03:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d1e60531c9f5f948bec2885ddc616e74 SHA-1: b4853df5a6f6b3063f098e71b45c6aee8051ba25 SHA-256: 3cafeebb06f02b9170290d3fa055b04ecbe96ae6a05bc765fbdd869bd540261e
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://radissonhoteltraining.com/userfiles/file/jasixopexigowipujes.pdf In PDF document text
    • http://esthebel.de/userfiles/file/rudana.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/fepitipemazifarevabame.pdfIn PDF document text
    • http://vantaibactrungnam.vn/upload/files/nufegojojogupelazefosu.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/66daf94d422465bbc74902bc14fcad45/9969395725.pdfIn PDF document text
    • https://wrd13.com/force/file/zipivenidobafalebewarojis.pdfIn PDF document text
    • http://zae.me/datafiles/file/pupeketagenaredasepitazi.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/74401245771.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/988e20ef7082d1d1ad209541547c3978/gibipe.pdfIn PDF document text
    • http://szpk.hu/_user/file/sasog.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/sufuto.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/lenajavuxaxivulap.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9c7f9918d---69507647837.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69629091740.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/7ce5d174f8bf7459eb53b81e7e532474/juviserojamojimi.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/46287595503.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073762bb4ba1---tugal.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/35659432711.pdfIn PDF document text
    • http://rc-modeller.se/images/file///88075198884.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799c2109ec3---79820731290.pdfIn PDF document text
    • http://abpaluso.com/upload/file/zobip.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac52c0dec37---19818254648.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=bounded+and+unbounded+inequalities+calculatorPDF 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_off0000e412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE412 10800 bytes
SHA-256: dc9ed4f6441dc0c8bcfed198ede093c67021746d19b72233e5f98c2d22c844a3
font_01_sfnt_off0000fceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FD 17300 bytes
SHA-256: 79a48f2b48532c2f997543650b81291ac5547523038407b6cdbd6e871761ab1c

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