Malicious PDF — malware analysis report

Static analysis result for SHA-256 b22aae93ac4dd34c…

MALICIOUS

PDF

164.7 KB Created: 2021-08-10 16:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 96507d7f98965e4f6b3834f1763453d1 SHA-1: cd9936ac0b371a8e4975bb9573b0fb0a4cfa4869 SHA-256: b22aae93ac4dd34c6c816fcdac72ed8665260e11006a963dbedd882d230e63aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to external malicious sites, potentially for phishing or SEO abuse, rather than executing embedded code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=second+order+differential+equation+solver+python PDF link annotation
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607677125cf45---tujizado.pdfIn PDF document text
    • http://test888.org/uploads/productsfiles/20210707222100_a89a8.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/5254594014.pdfIn PDF document text
    • http://easthighclassof1962.com/clients/2/24/240b89ecbeded73b1ae3fdc7544f4fd7/File/11024785906.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/5aeff99d1a5219efad835d0c6e33aab7/14317242257.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/59421256399.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/52872192247.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160dbf216d6d34---foguvalipobo.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/ef003dd9c0458e4f76679b51329ba843/92985952481.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/53664843513.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad737a96190---82497969020.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607626a561ef3---kuwalojalusew.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/73512872855.pdfIn PDF document text
    • http://tingyi-bnb.com/CKEdit/upload/files/94359164700.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/084463ea74469210d49f94f8d95433bd/63442925622.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610e127b85c58---wixejad.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/a2c0ca9c5f262a40b607a7e84f4ce04d/74476229016.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/velemejir.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5c0b49d2c---zuromowaxapazopini.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/46716464342.pdfIn PDF document text
    • http://geodez.com/pliki/file/ziwibebefopon.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/xujetabudalufufuxuli.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/tbcdf814sahhadpq6a6d4496sh/wimozuwirugogosoge.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fajajazuxiliva.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_off0002213c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2213C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00023953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23953 11216 bytes
SHA-256: b2f72f5fa807919c57b41843f4d3448994cbfdf3336a666bd11c3562c5331c71
font_02_sfnt_off00025357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25357 18356 bytes
SHA-256: 4df76b32be65a491c1037c3d1a8861acfa506d1f2300f61af53a842d8799551a

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