Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e796bcfb8983cab…

MALICIOUS

PDF

72.1 KB Created: 2021-09-01 16:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: fc7ff4d71d8878d144bb9db63d4e699d SHA-1: 7574459ec9ef84df07d153d8dd158906e5897a2d SHA-256: 3e796bcfb8983cab13a2d5efa68f68a8d6cd5be4fb839ae7aeefd3a50323571f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript 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 0.9947

Heuristics 7

  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tonymusic.se/UserFiles/files/64085129273.pdf In PDF document text
    • http://fujiya-la.com/uploads/files/wonekiterivofijarejiwu.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/49972777048.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/meriragenoj.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/77245228707.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/pisirogozekorupodinimuso.pdfIn PDF document text
    • http://hhs63.org/clients/8/88/88ec95b665b56da82b1de85f097fba10/File/71766514078.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccd41a5b1f9---79975789359.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/wizazabimefuna.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7d0381be4485110ef57a1358d24d9182/60781456614.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210624020910_224323840.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/tilalujabelufapezuzimel.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/nemoxarekanowogid.pdfIn PDF document text
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/xevidiwaxefag.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160851b78724ad---vovuxawadologufejevub.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900709aa0c7---nefipixefa.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/ganoguvubapumusilu.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/dimawimip.pdfIn PDF document text
    • https://prosperitas.be/data/assets/file/sazuxumufimovogol.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///69310080281.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/6555179184.pdfIn PDF document text
    • https://unicornccc.com/ckfinder/userfiles/files/67463412776.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/41193697087.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/susoluxubititiwesudegi.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/66294609186.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=natural+extinction+examplesPDF 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_off0000ba15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA15 10712 bytes
SHA-256: 697572d16456ea2f73c042ec810d9254dcd1d5f2b46380da2d98f6ea8f20a93f
font_01_sfnt_off0000d2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AE 15816 bytes
SHA-256: 6288402091a7c206cbee1333338a3551994243e8df4e22413ab7f17decbb325d
font_02_sfnt_off0000fadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1