Malicious PDF — malware analysis report

Static analysis result for SHA-256 864e318de451dda7…

MALICIOUS

PDF

77.7 KB Created: 2021-09-01 12:55:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e900c37b39a5dca9e12813ce82f42445 SHA-1: 00267e1c9897fe8b9b9829a34cd2232fcaab77b8 SHA-256: 864e318de451dda7eb2e1540e42da1fc737eb2493d3cb4824e455af76d9b775a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The `wkhtmltopdf` authoring application is noted, but no scripts were extracted to detail specific execution methods.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://fu-xin.tw/uploads/files/202108201629167172.pdf In PDF document text
    • http://mkngsp.ru/upload/files/28468733717.pdfIn PDF document text
    • http://polipack.ru/content/file/vodupuvererezivenoxudawu.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607469261f4ff---kawiseresedemadesas.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/9faddc34f9474e87c283495c417759b2/jiroxogalekelujesupu.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/xekilinobakom.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/8116594426.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b8aa2b474---84701693585.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/89274287751.pdfIn PDF document text
    • https://kis-u.com/page_data/file/20210614194642.pdfIn PDF document text
    • https://www.pbri.in/ACP/ckfinder/userfiles/files/92366213498.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160777cbc2d828---63906151088.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/j6jpnipltmp7bi7cn589ndh03l/juwukipa.pdfIn PDF document text
    • http://wenxuezj.com/images/File/52613753532.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/jebifokuxelugarazewiz.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a922015db2f---rizefanepetumofe.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16093cba9e247b---43724487703.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e457c956386---36323167406.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/40527368355.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/kitawogu.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/51578592169.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/c03c3fa005af7f2073f8824f4010a0b6/gibibulumalajurex.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/0qskipc5n831ouk25bbq0cm961/16744497198.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=what+are+the+common+factors+of+4PDF 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_off0000ccc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC0 10532 bytes
SHA-256: 357f5491e26cdd39ecdd9b2c2aa9527c8154a74a524cd34ab8e50546cf20a504
font_01_sfnt_off0000e4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC2 17432 bytes
SHA-256: 2e016ee347e441ee249cd3d8f8e0ca5fc6961d1695f4d726c455b201a72b3f73

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