Malicious PDF — malware analysis report

Static analysis result for SHA-256 c323a5bbbcf9a53e…

MALICIOUS

PDF

84.0 KB Created: 2021-09-06 11:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 050b16979a26c4670d3a8dbee35fd1fa SHA-1: 9b71c00f67e4404a282186dea25e3fcb740221f6 SHA-256: c323a5bbbcf9a53e6681aa0063c65de60f5acc43b1d8ea20e526622795fed8dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with a link farm attack pattern, likely intended to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://oniceh.ru/uplcv?utm_term=solu%C3%A7%C3%A3o+soluto+e+solvente+pdf PDF link annotation
    • https://hophamthaibinh.com/upload/files/58009568236.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bc957e82a---61057405106.pdfIn PDF document text
    • http://bfo-walkforhope.com/clients/e/eb/ebd0efab9cd97e953e90891d9eec7aad/File/rujejuzabomuted.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/c0d6515ba18a2d91ed68d8e8dddf663f/kipexo.pdfIn PDF document text
    • http://bungefamily.com/clients/5233/File/18214967701.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/vutemedubedob.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/79292829137.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/9718e35ead3b1c6098b6102d1a787dd4/78740808109.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/kutuxefivo.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/28e9ce0a925594b6ddc2ddf8cb651bbe/pesiguzevunosapadete.pdfIn PDF document text
    • http://quaint-house.com/images/blog//file/72065876942.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2c721acbe---xeporipu.pdfIn PDF document text
    • http://donaldbermanmaimonidesgolf2021.com/clients/0/0d/0d43fbb8ff91cab41fa1b056c0d912a9/File/75214388875.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/demikitig.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210801190228.pdfIn PDF document text
    • http://nurugelexport.com/ckfinder/userfiles/files/5509674026.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/cr01p78bsp2t80b7o2gende8e4/remijiri.pdfIn PDF document text
    • https://murtenhof.ch/userfiles/files/sodadupuwakapo.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160727d5a33a13---dirupipuroma.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c953f077d7f---bugoruwavitibakidafarat.pdfIn PDF document text
    • https://coatielectronica.com/files/69106315355.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/pajafokigurof1624836609.pdfIn PDF document text
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/tipezajilatoke.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/xewukur.pdfIn PDF document text
    • https://fong-cai.com/upload/files/weguxabigumelapetezaliti.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210621235826.pdfIn PDF document text
    • 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_off0000da6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6B 10844 bytes
SHA-256: 0591d734c6f791f72d6ddeebbc42a43649629c8c60c2b9c91611de07d87ee186
font_01_sfnt_off0000f3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A3 21052 bytes
SHA-256: 9094d4bbed3384a32df655a8bf3eb2a0b10e143d841b50e3e94d01f9a58eb229
font_02_sfnt_off0001287c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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