Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dfac22db2c21dbd…

MALICIOUS

PDF

75.3 KB Created: 2021-09-13 07:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ae42dd9691549cb1d5234d4182f4ee06 SHA-1: 6abc2ab9cf0941659c32ee7a1baecc0824104ce8 SHA-256: 9dfac22db2c21dbd302abd05ad5cce9a1a6147e09c93e76f2ba0647b1fd3cf90
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to websites hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly support its malicious nature, likely serving as a phishing lure or a downloader for further payloads.

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://nail-free.com/ckfinder/userfiles/files/20203024277.pdf
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74180857273.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae3e061618---sixurevamazej.pdf
    • http://driver-jazda.pl/upload/file/xilalubapememenegejame.pdf
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/67122701355.pdf
    • https://nonbodepsg.com/uploads/files/dilobipobowimofitefafe.pdf
    • http://tomgiongvip.com/uploads/files/file/jenomudelamunirijemo.pdf
    • http://web-news.eu/www/pkpar/userfiles/file/8320805573.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133cdbd0195d---74518180232.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/524c1lvtovq50rg7i288uhrf1j/46134858286.pdf
    • http://delfosventures.net/userfiles/files/25677680755.pdf
    • http://janjoling.com/public/ckfinder/userfiles/files/mopevuxizanuguxupewe.pdf
    • https://sportnazona.bg/f/uploads/files/tojemebuloroj.pdf
    • http://dulichtantai.com/files/uploaded/files/9256477690.pdf
    • http://gs-metals.com/filespath/files/20210912114506.pdf
    • http://helloslow.com/data/userfiles/files/15638545106.pdf
    • https://infotechsystemsonline.com/ital/www/img/file/24531636830.pdf
    • http://www.arborvitae.cz/ckfinder/userfiles/files/ravutiravusilodajurabeju.pdf
    • http://amongelite.com/ci/userfiles/files/kizis.pdf
    • http://mtcnx.com/upload/fckimagesfile/gaxakadutesorulol.pdf
    • http://alexlunacoach.com/img/editor/file/86695275544.pdf
    • https://kingwaterpure.com/ckfinder/userfiles/files/lawawejodesawufoxajulavi.pdf
    • http://netinflux.net/userfiles/file/joxuverasugomaj.pdf
    • https://luatsuavina.com/userfiles/file/81060849485.pdf
    • http://geometracosentino.com/userfiles/files/73822019298.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=udaariyaan+mx+player
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c55e.bin
6bb1733cf1be10f17920155044b9fa27a8bf50a2efe0ba545b68df1d51a12d5a
pdf-font-stream PDF embedded font (sfnt) at offset 0xC55E 16620 bytes
font_01_sfnt_off0000f04b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF04B 16792 bytes
font_02_sfnt_off00010862.bin
50e0fa01e458fc0e8ebfe4012987c77583d955d9e906a0bff127b869def8cd2f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10862 10392 bytes