Malicious PDF — malware analysis report

Static analysis result for SHA-256 245950a101954464…

MALICIOUS

PDF

91.9 KB Created: 2021-07-23 07:02:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 30e9dc053f9fdb571f008d48ae013e2d SHA-1: 7aca34655ef61b66dcd779fd68dc8aa09005d23b SHA-256: 245950a10195446400ccb4199af264d02ef3de6225075d24d795b10067947b1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://parquesanalbertohurtado.cl/ckfinder/userfiles/files/82843774351.pdf In PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/78142895486.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/e35f3f859e44c8de386877d4e4d7f8e1/sowepowiwokirof.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160acaaae0d4fb---65547055933.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/b2ce0fbf74d91ad68765c85f71cc9540/83539681512.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/vokadusutenoxa.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/padexumejikumomimarevofi.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/f2cf4bb0945df538a9cadc4f91ca4954/fofamonovifilezumozapagar.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/08fbed5c44869bb35c79a260a89d1640/35244809416.pdfIn PDF document text
    • http://latexindia.com/userfiles/file/37403924644.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607be6862d76b---42074417013.pdfIn PDF document text
    • http://bkbflooringusa.com/userfile/abbey/file/pubumateko.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/27e4722deb3db1b71019a127e7c319c8/femukinoge.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/86682310169.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/41349528734.pdfIn PDF document text
    • http://aurora-c.jp/files/files/36976064203.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/16929376856.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210701182439143.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/62311100274.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/20375313844.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/73549739534.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/7e1e111ac0f1e4c4810c6b1f8ed96d6b/23353897024.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/6d196cb6a48bf44ef63de65e55a9130c/tajapaziruzavevaf.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/vepiwopulob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=what+do+girls+like+from+a+guyPDF 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_off0001025c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025C 10996 bytes
SHA-256: 96ae378a4132fed40328484a083b40217e5c667dc81793d096b2c6cf002bdea0
font_01_sfnt_off00011bbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBE 16852 bytes
SHA-256: ba752caae5733515e1806db886abfcf5eb013fc6e16fcf1c36f51e4a2cb3a791
font_02_sfnt_off000147b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1