Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8316cdc1c9da1ab…

MALICIOUS

PDF

84.3 KB Created: 2021-09-01 21:18:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5f7a27d577d3d418834e429f6269e48a SHA-1: 10dfe3411330274e5b2a853d5120f434ec6b4234 SHA-256: e8316cdc1c9da1ab533900df96ad80678a51682031cf7a14635968f7b66c209a
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to manipulate search engine results or lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=the+legend+of+zelda+ocarina+of+time+all+bosses PDF link annotation
    • http://alhouti.com/userfiles/file/kebexaruvowozefuka.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/39658395217.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/dba4c6dcc379389a845c463d1b9623f5/wisilizol.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c05fca7eff6---regolofavemoxokok.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/52559368050.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/dacjlvs42k8pkebh2kle3qdi45/54378261177.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcfd36ba72---rojikalefimaseke.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/14655542971.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/74322829309.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/75882088e242e2cf5c0c80d9dd7998f4/boruris.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/fexanisotiforaxukizasof.pdfIn PDF document text
    • http://talleresjpg.es/img/file/nudikotafekosuseli.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/vugerupi.pdfIn PDF document text
    • http://better-pharma.com/images/file/files/tupewifi.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608f77650f19c---dagiwezu.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/fapejum.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607cba07e18ef---71761151154.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/26467026751.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/9svma2dmim241bodhvt5c00dgo/natazalefimotunevalafati.pdfIn PDF document text
    • http://ahchala.com/img/file/899157249.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/d3c3c64bd419423d925373a8ec1d3e93/29149336016.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/27774596495.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/74586863577.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c553ca70a5---pimez.pdfIn PDF document text
    • 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_off0000e4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A1 17328 bytes
SHA-256: 538de5f2d0906ab6646b83335993e4b287de2f2ea3b4a225470686a7b2697b80
font_01_sfnt_off000111c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129DC 11088 bytes
SHA-256: 7f097856e215251642d9a360b7100775849da84dba1433c37fdcdf8cd26c9a82