Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ead4fea9b5aa3cb…

MALICIOUS

PDF

73.2 KB Created: 2021-09-03 18:01:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b558c29ad11f792d19c6d459759cd137 SHA-1: 87496c1f366485317f631ea81df843e71203dd04 SHA-256: 6ead4fea9b5aa3cba8b9339997d2dcf506fa5cbabfd82ce65dbe5f0659c29f4f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggest a link farm designed to redirect users to malicious sites. The PDF structure and embedded content indicate it is likely used as a lure, potentially for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://wastran.ru/uplcv?utm_term=world+cup+2015+cricket+schedule+pdf PDF link annotation
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/98437ca58bace36afdbf1f33d4e70322/setolurigamaziginijunafak.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/42306658849.pdfIn PDF document text
    • http://zuche0551.com/upload/file/71969134042.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-8/20210508103308271718.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/be15944a05eb8b274315fafd08fd344e/wuxemapuguzajuliwalirewow.pdfIn PDF document text
    • http://tayles.com/uploaded/33814026191.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606fde48189a5---30437243732.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160711139f0a77---sabugijado.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b93d76572---73306020357.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/kafipabisim.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/65c764a954c159ad95d770089e199bf6/25380393738.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/7b9859fce9d289b88dad581d57ac170b/pexebuje.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/xoziwikidupudi.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/160982c046b5ad---68948624829.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/47291229489.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/jubozirafagolus.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b348e73b9d---sejalusilonumegikaguw.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16073a8aec84aa---pamulepelorenulexerosit.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/65195423378.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/69395087853.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/2021562323225742.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_off0000b769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB769 11064 bytes
SHA-256: 9e17328ec9c2ae0ddc9bfddc827b4ca767a2a3e2461a367a2d7c59c962ac1f47
font_01_sfnt_off0000d170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD170 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE982 17676 bytes
SHA-256: efcfb373687291d587173ae566d0b6b6226caed67a5835e1c2251532a177212b

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