Malicious PDF — malware analysis report

Static analysis result for SHA-256 db7712bb51554bbb…

MALICIOUS

PDF

87.3 KB Created: 2021-08-01 22:43:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e48ee51a1fda81150fe7c24f103532b2 SHA-1: 98a323a8b758d556c6a44befce4cbe87822a993f SHA-256: db7712bb51554bbb55ddd048d60b8ae75567dbee553353ddb0d2da5421e82aad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier. It contains multiple heuristics indicating it's part of a link farm hosted on compromised WordPress sites, aiming to redirect users to other PDF files. The presence of external URIs and the nature of the link farm suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/5fpjnse2oc64gqlj7st171b3vp/kiposozurejosen.pdf In PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/39182188426.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/wexatetuvabuxerigoz.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/12485034718.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de61836b918---bijitotofakiluxagasow.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/xubigokun.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a8060787a---savojamabipakafuzapijaxa.pdfIn PDF document text
    • http://quaint-house.com/lapamimarinuw.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9689ddb4c9---64773697146.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/kezerorenakobewewubikufet.pdfIn PDF document text
    • http://stroi-sistema.ru/img/45965740423.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/h147o1vth722tg3vajlql5mlhk/23359130108.pdfIn PDF document text
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/m0sf2rm63ikodv9i93qnr5ah50/27745571137.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/7bc1440be22f26e2dc5537ac8f994469/metazowopewasosixutikom.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/xijonaxowasojipovavi.pdfIn PDF document text
    • https://bojovicsirogojno.com//files/libaneguzupatenavum.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a469b453c2b---zodijixesojoginefuzebive.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/ce096267a57c5344e958d57e3c58e71b/89844752547.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/7a14a36bcf4b10e82eb3c924501974ac/89471776719.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9fd9e3123---78677721647.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/55336512561.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/13642847942.pdfIn PDF document text
    • http://womensmentalhealthmd.com/clients/9/9a/9a9ccad1be43d50cbc9928f06550b956/File/nikazoganaloda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=valores+normales+de+los+signos+vitales+en+un+recien+nacidoPDF 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_off0000eed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED6 10848 bytes
SHA-256: 44eff7a32897d80a920e265e5049e6bf8832c03b985139ddbbb8b49c410ecf16
font_01_sfnt_off000107b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B1 17548 bytes
SHA-256: 2ab388b57fb9553826dbe1e50864162dff4894044a76c695621819cc6506bb2d
font_02_sfnt_off0001347a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1347A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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