Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad4b0e792558119e…

MALICIOUS

PDF

93.0 KB Created: 2021-07-16 04:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: aadf57e259f471b633108b9a8c7ffede SHA-1: 97c066dadbf3620f0c86a2a1a54e3769757b589d SHA-256: ad4b0e792558119e2ee465c08d34b7228e321f07dbfdf3cde6ccdae214872897
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, but the heuristics suggest a link farm designed to redirect users, likely to phishing sites or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095314d4fb07---92843691204.pdf In PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b6da81b2d---36477768395.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160838054ea69c---9630030147.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d29e4da8ad---jikozewivovipamaletigobe.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ce15b02c1---71123510542.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160919853e9f79---venajawowunujotatusifular.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e21ad2ef597---53514332471.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/kemasenenozuxike.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/m4dfrhfrdtoe108jtn14oc01ie/lowoxinutuvijat.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/81297004617.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/zoxusugaridutalibiwed.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/9319602e7c6d0d6bdae7422148f215cc/nadaruxibolilaje.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/10845550827.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/583849ab2aa2ec4df43d79e6692237ef/34156936779.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/54196568305.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c22a660ecac---91427931145.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160703146e4f2b---27716155579.pdfIn PDF document text
    • http://sammyurias.com/userfiles/files/gejobosidenalig.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/80814246146.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/cdc553a23c016384740ed0a30dc16101/rafajilurikofubowemid.pdfIn PDF document text
    • http://balone.net/_upload/file///vezuda.pdfIn PDF document text
    • http://nature-revive.org/files/file/7947483856.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/79efaf98c0675dbd0ec8d154959d7dc9/kegudajumigobipalumagire.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/9194293804.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=coin+master+unlimited+free+spin+linkPDF 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_off00010803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10803 10884 bytes
SHA-256: 966131d9bbacba1a7a938d9d9713f242fff4df57383fb2745deaa76075729f68
font_01_sfnt_off0001212b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001393d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1393D 17428 bytes
SHA-256: fdc81b52060bffcea94ff358fe006e473ad74e2a09de3bc4027626b67014e556