Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bbec89c355181a1…

MALICIOUS

PDF

76.8 KB Created: 2021-07-02 11:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ec22f8897c7714c0dfb99b9f37b296c2 SHA-1: 88fcc0d2080963ff9e1bce6e7750a48cc0cd556b SHA-256: 9bbec89c355181a167b0e245899fc066be6a34d2f6f31bc70fb20c4c11c248b0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to distribute content from these compromised hosts. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/dh2vpsoprs630k1lfr5vbmjhbu/78925714122.pdf In PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/br55fotcp8ot431s2mdeks7vlq/dogeje.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/pelepuvuw.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3f48c2aef---22648422895.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e81dd4c811---11962628344.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/670567fe101c03fb4e11f865eab8db3c/kumodidemazefepapap.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/83031441905.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/kkpkl8l2ohdcic5t7fbmneadpb/razedamit.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/81716370448.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0e4339bab---84953506664.pdfIn PDF document text
    • https://gangnampools.com/contents//files/xalabizifokolujavevasaj.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/vidopugedebaz.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/2rggdgocf3ma3v9s2f6j2u65u2/butexo.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/bezifex.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/7de1499c7ac89a92d098dcc53baa39bd/80218791025.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/1b701aefe47b57f0f3cea0c95c9ec52d/bevuwir.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd99a0cbc4d---rekokotemi.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfed2d9d40b---xepimidobavawirus.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/4396307e8d7bfaa96b9372c37bb3eab2/94489639047.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/sokosikub.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4736e5dd5---27267949024.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/vibibuge.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751d7cc807f---pulotizori.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/c6307da24f81e8a9662d840502eee262/87488246598.pdfIn PDF document text
    • http://jhferry.com/data/fckeditor/file///topududapuxifibasu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=goldstein+woods+and+alaghaPDF 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_off0000c783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC783 10552 bytes
SHA-256: f2beabe04528f8766256747b8eb259313c5869b45a86ee160cf3daf18c215e2b
font_01_sfnt_off0000df57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF57 17688 bytes
SHA-256: 2d0da365a4c7b9ee76db8f475f83e86db1f2ae356abb7324224b39e342c829bc
font_02_sfnt_off00010c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1