Malicious PDF — malware analysis report

Static analysis result for SHA-256 6684df2174375a76…

MALICIOUS

PDF

85.2 KB Created: 2021-09-23 05:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 271d537d4c7d47ff996339f0e3d73a87 SHA-1: 13220602be9513fcc43bc814db3554a87aa4e4de SHA-256: 6684df2174375a76beda018459d145ab5fe4c26a87054759a1af5f6303e58f01
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 or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://carszana.com/image/upload/File/40268712971.pdf In PDF document text
    • http://x-site.by/upload/editor/files/buwam.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/gunogugokenotus.pdfIn PDF document text
    • http://livilgirls.com/files/26068567471.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/gb046h3d6otrvlc822pljchsvu/tuzapujuramusegurukow.pdfIn PDF document text
    • https://receptabc.hu/images_banner/files/80322541980.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/rulunokiwapisanewapituko.pdfIn PDF document text
    • http://school15-tyumen.ru/f/87456446800.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/lovaziramakefud.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/rogesoxisegefekamizalem.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/98576581749.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210921134802_oaky0s.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/mazobifumipi.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/41851914225.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/weloxutawixazovukuxaleli.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/milelalatokumu.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/47523706908.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/2a976280058177b334688a835e2807a0/75228403175.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/widopedojuparosa.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/33430761299.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/paxejegokaxipowinadokos.pdfIn PDF document text
    • http://erfansari.ir/ckeditor/files/files/xareketaxe.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/87583114067.pdfIn PDF document text
    • http://sinners-party.de/media/file/49762982261.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614b8e2c754c9---kawadezozin.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613589d4be029---48394521672.pdfIn PDF document text
    • http://kaies.net/upfiles/21091911495165453565abg3.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/57695913596.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=gb+whatsapp+plus+2020PDF 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_off0000e819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE819 18072 bytes
SHA-256: 784e8dd06045d1a7cf2dd476980cf38557e1978f0f7b218ece624fa62cbb7fe6
font_01_sfnt_off00011708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11708 10408 bytes
SHA-256: b230584c30a383aceb3fba8cd2386562e306915cad68a54ac7030e454a5f10b4
font_02_sfnt_off00012ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1