Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa273b9ce7690cf4…

MALICIOUS

PDF

70.5 KB Created: 2021-09-05 07:31:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 75a336d68f2627cf925826ae1c696ed3 SHA-1: 41f7d363d191eb62e55fbb3cec135ae810d4c98b SHA-256: fa273b9ce7690cf47a69b8610030a04f0fc097817fd1738cf618c2e4151e966f
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure indicate an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://acutecardio.ru/sadm_files/54485602269.pdf In PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/31a0ff87e9b9e5071b6eab25d6ee4e11/79165103912.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/lisabede.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/razemimuvugale.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/kogunarufuzuwelomiboji.pdfIn PDF document text
    • http://r2doodles.com/clients/4/4a/4a4ed909dcef54c1e3ec6a0ce1d29f2d/File/47842100630.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/gepinezuvuna.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/muwamuzafaziviwezumowoju.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/kolamafofesalaronore.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4158e266d---8793727017.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/dotap.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/38801209888.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/655e6f8e56f64c918d1f10f16669b292/milujexajimutomofuwal.pdfIn PDF document text
    • http://jarosi.hu/files/file/liwevimikifuxafumuxe.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073fbb07fab1---pesaxajubuma.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/bizapenixafefirobu.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bed88bbc9---32761588052.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c4c370aa6---12756229493.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7af70919d9---jifaboxenewaniguwesu.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103172445a14---34385273946.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/kezuwomupubawafovabaragi.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/xizokofe.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d748790c7b9---9265368707.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=ecology+analyzing+predator-prey+relationships+worksheet+answersPDF 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_off0000b5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B1 14860 bytes
SHA-256: 9dac856600d0bbe984ee92e9786b6c28bd39103f90d5835da6782baf105e997d
font_01_sfnt_off0000da44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25B 11164 bytes
SHA-256: 1313bfd8afcb29f1c6aff60d66913db1848599419f5bf10e875fa1fef62a3bee

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