Malicious PDF — malware analysis report

Static analysis result for SHA-256 db5fee678ad9e161…

MALICIOUS

PDF

81.5 KB Created: 2021-09-01 21:29:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c628bdf9cca434df5ad54d794e911725 SHA-1: fe228c81ad4f66be7d92ad329d07a7eae77262b3 SHA-256: db5fee678ad9e16186c3b01ff3d4da5b0db614e552966a3b44025a4000c7c8c9
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and a link farm structure indicates an attempt to lead the user to a potentially harmful destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://doctour.hu/uploads/ckfinder/userfiles/files/suroxokudomedoriwomuvawaz.pdf In PDF document text
    • https://limmaginebistrot.com/file/28662604614.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/33486894376.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/19686892313.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609458e0380e8---podudej.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/mudujut.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/63790376184.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/mikodimeloxufavej.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/87993302746.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f487b622b6---9980058200.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf77ac55dd---84027598231.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161254db4e40d6---44251643004.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/5no5a147pdvprsbd85bdbnlivb/ragim.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/e725ac79f5d8b63485023d8266bc1941/luvefumofojojozak.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/64656090130.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/0ec5cf31428d6a75b6875c730b434f1d/6626847203.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/t3fb7pqq1buqbh5tbscnmo5io2/sofed.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/73b3ab80697fc746ee99c5c9b8aec2a3/59141206652.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/sobimasaduzizebavabo.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c708c67e1c8---livemimijapewozoxurir.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/990fe6b49b8cd4e2660d6a0eb7a9d4f9/weburolilobuvomumotaw.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/lanizokot.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/67511619805.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/163014927741.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=audit+report+qualification+examplesPDF 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_off0000dd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF588 11112 bytes
SHA-256: 50432d3e1fce929591bcbd03ca02cabb90390d0a63efb13cef5e708e0db64a84
font_02_sfnt_off00010f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F34 16192 bytes
SHA-256: 1c400557479f78109a4b203a8761d91931754fcaf28185c285d1e1e426f86c36

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