Malicious PDF — malware analysis report

Static analysis result for SHA-256 70f328b53298a29f…

MALICIOUS

PDF

81.0 KB Created: 2021-09-07 16:38:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2288773d4d2be9b2eb0b0aed0b274fd0 SHA-1: d5950332f88304a5443e0608cc3e059b670df390 SHA-256: 70f328b53298a29fdac4e394e6b984987b5233e515a7494b7129624477a93988
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs likely redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/b94jbh7b0iv98pu2aravql2u87/10768186149.pdf In PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe67aab1be1---69795989421.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/65533b498b0ba9badf3e824b2ddbf6cf/53828941447.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/sasukewozovoxejoledusamu.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/tazewekudode.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/xubodoxasekigasida.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160779576b69af---63661566989.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085426537fe7---vinukaseripeboke.pdfIn PDF document text
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/fejelulinokabuvipixojife.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/roafjoba7rneqvidhc702n680v/radelipetu.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/figami.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/sowixigokagolibi.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/begevilerakiwovaz.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160809952da13b---43529036815.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/198d4ddc70bc49b224dbb62410fb9e8e/wizebiwoxadi.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/87841557323.pdfIn PDF document text
    • http://prmakeup.com/Image/files/talinasoxekuxinuwuganeton.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607209e8ee97f---lexalozirawa.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/4108767436.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/2636674588.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/b89df60a987b0977b3c3a269bc7eec1c/mirizesivimikefemam.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/31546832323.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210808184922.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=come+scrivere+su+un+pdf+adobePDF 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_off0000d930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD930 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF142 16888 bytes
SHA-256: fb674a198de71419e8f08dfb06970c800cd6dbce56c7b6e8d6a8aef7e3577ec8
font_02_sfnt_off00011d1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1D 10976 bytes
SHA-256: c5f49019dcc3786d6af2a1dccad9330c19f4569c4c5d50208ef9071ba0289a71

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