Malicious PDF — malware analysis report

Static analysis result for SHA-256 fff851b87f1d181b…

MALICIOUS

PDF

81.3 KB Created: 2021-06-26 16:45:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 57ba6bbcf93edf2c223f09845322b90d SHA-1: 4997a2c582538c6b3dbd55ab7933d95a1617f7a8 SHA-256: fff851b87f1d181b1ffbcd3e985272387843bcc8fb49ff1d321f774c1abe589a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and link farm heuristics, indicating it is designed to redirect users to potentially malicious websites. ClamAV detection and ML classification confirm its malicious nature, likely serving as a phishing lure or a distribution point for further malware. The embedded URLs and link farm structure suggest an attempt to exploit users through deceptive redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://irlanc.ru/uplcv?utm_term=convert+ocr+to+word+online+free
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/krut5gmmnbieoaj3qpukva0ek4/wabijugibolomogaf.pdf
    • http://webinaris.biz/ckfinder/userfiles/publics/files/51553971807.pdf
    • http://kpdb.org/userfiles/files/75923993561.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/o16c4nu3cjrcar7jse4q0o61mg/66149219839.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/9a2dc5d0e7b30a3ab0b6a9e05cd0b3eb/42926343726.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b14a7806d---15472826564.pdf
    • https://thekolkatapackersmovers.com/ckfinder/userfiles/files/zavesij.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/1out799jcg56f21hbmi2vaals2/11765098251.pdf
    • http://shqinze.net/admin/upimg/file///56460450496.pdf
    • https://sce.tw/uploads/files/60bd1acd2ab25.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/tcn494pav8sd3ct5u8cjjg2sk1/6660407512.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af763717a96---tefidobemuli.pdf
    • https://bandai-k.com/userfiles/file/bobowoted.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baad51a7154---58860794703.pdf
    • http://amandatravel.com/userfiles/file/pepivadasetawej.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070d1c960467---23295401304.pdf
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/2650549869d50ee052469dfac089b44f/62000976453.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec06ed6499---dawunivoronaxupob.pdf
    • http://childconnect.com/swi/fckfiles//file/3943681682.pdf
    • http://cosmickino.ru/sadm_files/fixilofukafup.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b49f16c671---16672419997.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0144dc03f3---15126717847.pdf
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/f3ee00ce4d0f988d870b28f27e309c5c/4042247526.pdf
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701861ef58f---vatoxonozebofekenamef.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/1c2824324699f0b2d4d3ea8738d9b1ed/rukumafagasan.pdf
    • 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_off0000d71b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD71B 16792 bytes
font_01_sfnt_off0000ef32.bin
f5dfe5b008111039ed3a7a8ccbc29ef5d4e16e81872ef463f6f84f9c83634970		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF32 10320 bytes
font_02_sfnt_off000106a1.bin
95051159a5045c5e646e58975d85e0ecda409e5010ff02d722ca2033fb82a92a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106A1 19308 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.