Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c5e15fb53108265…

MALICIOUS

PDF

81.6 KB Created: 2021-09-08 08:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b87c32b5008923100ad2fdc81c5761fb SHA-1: 2b4cab595aae5fcd516c0fbea962c654dfcb9d67 SHA-256: 7c5e15fb53108265de2968e7de610a1483ee568ecea47d295ce0920824602a3b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://adamlegal.com/userfiles/file/56065170440.pdf In PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/6e3119c41c76544e35bc7dbf3a7fe4ee/nunidikesurej.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/7284891632.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed982426476---fuzuf.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105040829119137.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109030246138439.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb6a2201fc---76761838226.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/jaziwezu.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/40779956911.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/43821852190.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070385603478---68383840246.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/satusazebimopalubi.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/mezasirisiduj.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/ec563bc247a8fd1a67ea5fd1c4c9ad46/37012885605.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/61409485377.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f32367f07d2---77335396995.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/40f2f40a1f03398879613327e7a6b05b/xololewasasenaf.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/43215019742.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/sekelibugavufejelolofo.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/baa369e2d94934858b437715f9840f5a/savimimin.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/kokipoj.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/94603884843.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/19832713299.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=manual+soil+compactor+bunningsPDF 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_off0000db67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB67 10816 bytes
SHA-256: 0435c009ce8c09aa27e06b5ee53b327b733aa6058c8f66ea966085bccd575652
font_01_sfnt_off0000f416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF416 17336 bytes
SHA-256: 55ea09be5e59dd5c2f2e663015a8539d7fda3b79b1346200c19540de83a4c9eb
font_02_sfnt_off000120e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1