Malicious PDF — malware analysis report

Static analysis result for SHA-256 b93ac4f22fd2cc13…

MALICIOUS

PDF

104.5 KB Created: 2021-09-23 05:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1610cec4c5e76f02dcf698f243ebd7b3 SHA-1: 63d9b2465196df23ed532fe1b5cd916d17c1a82a SHA-256: b93ac4f22fd2cc139647aad503c89590c32134325f3ab70e68d2ddab5d0b2cc7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a link farm pointing to multiple compromised WordPress sites, likely intended to host or redirect to malicious content. The presence of numerous unknown URLs and the nature of the heuristics suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147429812ace---42989709010.pdf In PDF document text
    • http://fittbikese.hu/files/file/13951624233.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/wosifad.pdfIn PDF document text
    • http://slsnn.ru/content/files/vuzebosuxotarebukan.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/zenepen.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/latowefokilopiwofom.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b33bb92acc---65948880455.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/96626611530.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/pivivo.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/xiriwajudokepuzamasagave.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/purepe.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/xotuvaligarop.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/6a9e8845d3ac92fdafc8c427c50ab739/63105537149.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/71953835249.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/26067b02d2cef82d25212dde51a47c63/82229109405.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/20793770428.pdfIn PDF document text
    • https://eltdb.com/UserFiles/files/58122497664.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/76668446337.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/gajutavitezigoto.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/97769318845.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/juloxalubo.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/kotogidazodimekirira.pdfIn PDF document text
    • https://propage.q-cloud.net/upload/ckeditor/pages/files/41550270368.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bulawoguzubaxudeluxavaweb.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/kugekil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=sonic+3+remastered+android+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA7 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_01_sfnt_off00012532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12532 10864 bytes
SHA-256: 9235d3a811df0c81f938a6d0ae5011ee33b2861be5e0a447a7bec11111316ff1
font_02_sfnt_off00013e5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E5C 24052 bytes
SHA-256: 00af4a322d271401bb9b7cbe9fc61f573a28f7ffdc349fa36b5bad6f7b8c7ed5
font_03_sfnt_off00017bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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