Malicious PDF — malware analysis report

Static analysis result for SHA-256 b590c6147d8caab9…

MALICIOUS

PDF

88.4 KB Created: 2021-06-30 11:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 051ab1eb6c27b28d07e0e1c0e3fb921a SHA-1: 3f9c3ecacf051a59eb42e5f41c7222c2f96e3721 SHA-256: b590c6147d8caab9f3a126b2d2b1d29f404ce1e84427f149e15fb137d9155a2e
156 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to numerous compromised websites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting it is used to redirect users to malicious content or phishing sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.aqsclimited.com/EditorImages/file/fijawerax.pdf In PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160843629267ec---gozozesegobejivuluvafufa.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/a48b5ffc6de37e6750f972c420cd3a79/lerupalibunoxu.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/l85vtn17pi24r6ff3tr4krnago/70989949097.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/ae6bf4828476496b14053f59df7dda3e/futabozazofapu.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/2fae118ffb29e343ad82434a4f4108d7/8068954650.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/79380908341.pdfIn PDF document text
    • https://amblamy.ee/upload/file/fezexoz.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/d44514acf2b7ce5c4a188f7e8ec436bf/vulenukezaxekiwavegopesuw.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/jimivetisonebu.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/893fb98c4e4094b59806d5598124f286/pipiweli.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a74f72dc707---42826346148.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/83804296536.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/sizudat.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/89100ff6758e7890919afc10555b210e/mumoguruda.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/78206418025.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/6dvotj0565in9o2f568j8c34qo/16506780446.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca3d88a2e5---nazeso.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/15novo759mnpu2nfbm9a7j3nqg/60128873902.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/94680081472.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c19c2ec3eea---xusokufiwudezetof.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/a81c2c6c65c8d973435fdc8c1195ae16/mesoguketazogug.pdfIn PDF document text
    • http://citra.cl/userfiles/file/56979539520.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609439f75c174---39151917338.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=find+out+meaning+in+englishPDF 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_off0000f77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F96 10672 bytes
SHA-256: 2270f984f096cd3020489d8e3376a43611df1fcabe2e78b3974033ccef3da82a
font_02_sfnt_off00012795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12795 17508 bytes
SHA-256: 860cc9bc4112ab5f172f3a37be700d3545a54f7b6b43338f61148abb22fe1907

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