Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d3561cc52586884…

MALICIOUS

PDF

96.4 KB Created: 2021-09-01 21:16:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 247df6c889e0745187c7f839ed748d8e SHA-1: 2e820122c6ffe02f629963f996ce8d05941cee52 SHA-256: 8d3561cc52586884423375496a9954c484102eef1e024cd947156ef6ed38318c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution attempt. The embedded URLs are likely intended to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://homenet-spb.ru/userfiles/file/24483034722.pdf In PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/c8964280f05cbdb797234f60bec8e026/xobojaxebexokibin.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/dewesamefigefep.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/7f77e210a12f891b295a291c51a64664/xuxatiwi.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/fe37d649a22b4bd213a5f3d2a5c42b61/3119066799.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/0328ba72c17fa1dae91d53345c8bb5d4/lomexuxiwolaroxufoxonawit.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/37196160842.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/94253467635.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608608a8df3cd---tedasedazagus.pdfIn PDF document text
    • http://teknis.it/userfiles/files/41778800083.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/ralemakizaserebimobobut.pdfIn PDF document text
    • https://soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/bugutebubibujab.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/33069302882.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/vakodo.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095bdd9600e0---50067457162.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916db1477ac---nujabuwubebajobevox.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/gidezexuwexi.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/2082694137.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/d8acbdd970de871689273fe56a41dbde/61915741447.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098b20a0e68e---javawuneki.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/08a6e725ae1d606a4ce3605ce5b4f943/pogulukojenekowarosin.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/vogomawakozaroluzo.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/74718b3f7536ffbc0998d8c69793256b/43026577236.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/muwipasunawikaxasinelos.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f41042e93d---98241675709.pdfIn PDF document text
    • http://imbirimbir.ru/files/17986638922.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=con+170+test+answersPDF 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_off0001131c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131C 18428 bytes
SHA-256: bd7c80bb1ed2ffb3774a3d95bb94c1b078801f1afedd7f230b9b0e85bf5591c8
font_01_sfnt_off000143aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143AA 10304 bytes
SHA-256: 4f2fd29b2d5cac945ec3e3be81f8bfb25ec31427bf7d902ee10bd7c25b31172f
font_02_sfnt_off00015b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1