Malicious PDF — malware analysis report

Static analysis result for SHA-256 0166a364465b394d…

MALICIOUS

PDF

91.5 KB Created: 2021-09-06 15:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2108e7c4e94619d747bc9c9fd05f455e SHA-1: b348e7f948c1a4cf85e201c5209575075eb583c8 SHA-256: 0166a364465b394d46cac16bb221ec8f8944d5603ec8fa644cbda9e926daeafe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, which likely serve as part of a link farm. These links are designed to redirect users to malicious content, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c738b6ed58---teniketowixepatonikope.pdf In PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160758108c210b---41139378271.pdfIn PDF document text
    • http://cke.hk/userfiles/wanawu.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/bekumesonofoxukozokatil.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb6a5258f7---kibafa.pdfIn PDF document text
    • http://wawa757.com/uploads/files/15910476222.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a69b02b8805---14608370545.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/lalomofuxivega.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021063006022573499.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/c20700aee0770e5c976905d9f09f5013/99330484694.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1611dde10eb0a0---67220217054.pdfIn PDF document text
    • http://runo34.ru/attachments/file/95774775143.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/62767513097.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075b7b7ca701---pagavo.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/20104580370.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/38553957407.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/dojiwegu.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/gezowadavaxazuge.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/dutop.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de42ef305c4---24869605157.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/161197d4965e49---22365264519.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0d5cb4a99---gasudekul.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/45882388713.pdfIn PDF document text
    • http://bethanybaptistcolumbus.org/clients/75549/File/79724225226.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=alchimie+interne+tao%C3%AFste+pdfPDF 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_off0000edbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBF 11004 bytes
SHA-256: 6a8e51dfba843cad42607829004cb09393faf660e92cb8cdd129f95034dbe5cc
font_01_sfnt_off00010701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10701 24660 bytes
SHA-256: ece9e1052a4248cda6e72cd8e4777a12cdbbce6e54248a34824bfe76a75fa9b6
font_02_sfnt_off00014616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14616 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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