Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3805dff54e9622f…

MALICIOUS

PDF

75.7 KB Created: 2021-09-05 01:43:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cd63c238e16f782c91b11bc562af5c3f SHA-1: b4be9ee563c1b1e0c4403028b575a2f569d9d629 SHA-256: a3805dff54e9622fde9a680a4e2aa8aa80873ab99fb6471a996739ca7c9fc08d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple PDF files hosted on compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of numerous distinct hosts and UTM parameters in the URLs further supports the link farm and redirection tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0ab6623d6---1126025718.pdf In PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/fisiwugilowuralizup.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713b0e24a86---3138727895.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160f6f763c97f4---jetulurivido.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bde66c35b4---15018577090.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/238b8b6245421d5094ab355d022447fd/48044101983.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/linufo.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/puwuzedob.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/cde8350922daca8edfb02d0af01bd1dd/wadubavof.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/18869022554.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/16fa7de42cb165291e337db4b1d922fc/lenasatezetusesaganegodud.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/sobesamoviwinakofazasi.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/86111608494.pdfIn PDF document text
    • http://maydangson.com/vietkiendo/upload/file/46191169690.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948ba837a2d---nilasaduximo.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130711920065---67588002270.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/jutapat.pdfIn PDF document text
    • http://ihdbd.org/upload/files/82891202571.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/resenul.pdfIn PDF document text
    • https://www.nitdgp.ac.in/uploads/userfiles/files/wineb.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/78503344726.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/j8ebcqncpq83c0bq3ufo9rigmu/vegiwemifomolusuxidet.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/5uusqqu37bh61ti7c00epitdva/24514720207.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=vitamina+b12+absorcion+pdfPDF 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_off0000c3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E2 17076 bytes
SHA-256: 0e944cea13c42525fc902d4db4ed1e4aef749fca4e6cf9c3449f0323f2bb3ce3
font_01_sfnt_off0000f009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF009 10884 bytes
SHA-256: e93802b6a3e9c94afe475ffa1774311eff438dc36d80523805d41d26accc04df
font_02_sfnt_off0001091d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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