Malicious PDF — malware analysis report

Static analysis result for SHA-256 d93da747add2d2e1…

MALICIOUS

PDF

85.8 KB Created: 2021-08-23 20:37:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7454977798d23dcb1054e7d0fcfa9024 SHA-1: 2cbab6a05c4ca6d78070c90da1e64938fc25f24d SHA-256: d93da747add2d2e1d1b62d06d556cd4c211651823d3ff64b41230de6f95d024f
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of numerous links indicates a broad lure strategy, likely to mask the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://okeefesreef.com/ckfinder/userfiles/files/91019022706.pdf In PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbdad56d00a---xaresobuwejuxigipopek.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/67313013173.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210718_CDAE0780F5476224.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/2a56f56e1bcba70b044e33e8b1b6e8f2/momoxuzapemijosolulos.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/77040870918.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/rokad.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/jelotosomezezapoxofener.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/fesudozewexonagovepi.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/79225524496.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/u9rdr96nqm42v4mk3bcuhtiopd/46234941930.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/62627973219.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210610081230580.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/f916552b302e22e0c495e2a9f4f1269f/91713999274.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1606f257ae3384---76506872903.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a804c450da4---peduruwutakilapemugefa.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/tesazamidolodilixexegafa.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/ropomod.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/nirutezoboduja.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/1e7bd12b2d05baf748240cfa98b70dba/jugabulidodewurinupovul.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/vezelewipizemepobufavo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=crab+cooking+timePDF 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_off0000eb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB43 17460 bytes
SHA-256: 6c98d2f66be8ad7f96f8d5785f1132628c721534ddaed9ced007074d999769ae
font_01_sfnt_off000118ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EE 10620 bytes
SHA-256: 28ea803b524d764093d1f19dc2b291f22a9b806f02f9b41f2bd62ca2c6edc99d
font_02_sfnt_off00013145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13145 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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