Malicious PDF — malware analysis report

Static analysis result for SHA-256 86b1198ded1ffb0d…

MALICIOUS

PDF

80.5 KB Created: 2021-07-04 01:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2d23ae59cb83ffaa408fa1985de0d259 SHA-1: 0e8123428ce93650269676ce019c861e96767716 SHA-256: 86b1198ded1ffb0d2dedca99404878ffbac13d9a44caafd564e4be1a9fe90669
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or conduct phishing. No scripts were extracted, and the document body was unreadable, but the presence of multiple external URIs and the link farm heuristic strongly indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/b843d51a41bc91c7347537ef7f932d4a/89021966674.pdf In PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/b64d35ed6ac5938b74df66533615adc5/58919423401.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/naxakovisiwebila.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/5gmtu0h9ig2uejfuam5h4ktlc4/ridunusapenabejafedege.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ba7c6d1d3---32837473693.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/ligixenewo.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4d3a32e7eefddf603b7167b652c7ec90/lanelobopapifupax.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/cltraubjm6jkmtkuteg5k2c72e/8770094970.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/rirabiger.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/fe63aadac17b014b8b176b7843c42f11/wekefuvumebakozaxaj.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/69321652946.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/guzida.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/xojikatul.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5ef21ed02---69153020141.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/guxaxu.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/a06e9d101e1be0fd4dbcc194e2a66cb9/pakamulevawosalapubamul.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf5885ae75---mosepodofunifabirep.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ab44ce046---30952237058.pdfIn PDF document text
    • http://rjt1.org/upload/files/wimunukedaxeko.pdfIn PDF document text
    • http://coss-wynn-reunion.com/clients/d/db/dbe3622004495b304d8703879a486b7d/File/40204634250.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/81e0079ffb44cb9e64d3a84141134baf/sowobu.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/044ea9b71814a79cfe286a4973c1fcee/35264123911.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/66tdor6gdmdemu1kd54op7nnlq/wejuruxalijusijerek.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/b4c2b7632f8e763698ef50a5b2901f02/74059752008.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=easy+writer+andrea+lunsford+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_off0000d600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD600 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE12 17456 bytes
SHA-256: f3ddc7b430841312b62e086b4333b4714518f13f3c3f60d9af1e07d269963a8c
font_02_sfnt_off00011bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD1 10776 bytes
SHA-256: 8a188857ff1655fff3e4d645f4ba4d46d298fecd94698c0431e7e4da11b9b10f

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