Malicious PDF — malware analysis report

Static analysis result for SHA-256 2224fb5453a9aa2c…

MALICIOUS

PDF

72.3 KB Created: 2021-09-20 00:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3a088ddd0d53104ace54afa536f534b9 SHA-1: 72dd934d35e2559290ec956b91b50dd361204fc5 SHA-256: 2224fb5453a9aa2c4f557f42730e00eb53794368ae1f6a7407a9c7d0da8efcdc
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a strategy of using many links on potentially untrustworthy domains to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://archism.ru/uplcv?utm_term=unleashing+the+wild+physique+pdf PDF link annotation
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/148548632a4ca0d3cef2bcc2c6137807/12963643980.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/17155212618.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/nibifosopijogawom.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/f771c66bc87247c27e3b26d7397345a7/jogijudaxipi.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/zatidokusulujiveb.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/rivakujesodirurezetil.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/54424144064.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/gigerozo.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/83ae7dac38b7da8f5c1dacb8a8d426a3/xeworopev.pdfIn PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/53500865398.pdfIn PDF document text
    • https://tdfstore.it/file/satibi.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/xuzuzutolepuzigeritax.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1632085177vokarefodepisidix.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/dodimunuvakevixufasamu.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/defalolekizejoweko.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/71643522679.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/91202286009.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_off0000b645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB645 17396 bytes
SHA-256: 5c0fd2d059a2a0862abd4df08f9e6249db21f7658a013610efcf05a8a23f43b8
font_01_sfnt_off0000e36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB82 11008 bytes
SHA-256: 4c029c60c16804faa39c8014bf6943a224ad223bbc9604829dff41f9cbb92845

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