Malicious PDF — malware analysis report

Static analysis result for SHA-256 812a225a58308fc9…

MALICIOUS

PDF

80.9 KB Created: 2021-09-12 02:48:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c98c267b9e4df4ceb0114a9d0901250a SHA-1: 42025be0a21a5cb9a18e5afa9a0bffe9a853246c SHA-256: 812a225a58308fc9cec6556ffcb9c96acafee18f4756eec0a8bf81f292d62906
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URI heuristics and link farm indicators points towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://standsimulator.com/ckfinder/userfiles/files/tizubuxoroli.pdf In PDF document text
    • http://nemochem.cn/upload/files/11434996559.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/wefiwelero.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/bubegawadesufumifim.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/lidipafukekikebomax.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360e9d5100d---14026860942.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/gonifotamitodipi.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/kapogo.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/44757061441.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/jimeginagisag.pdfIn PDF document text
    • http://infas.cz/images/wiswig/file/paxorozif.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/36h81v87qhus3vkdknipjmspgr/xinaporovadazobu.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/ab8e1576d966d851394a35993d5f465b/81616791203.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/legugewiduwazefigema.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/9213701104.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/dajilukosizofopuzexugamo.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/zavufivubur.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/66927215973.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a9978752d---wafadebixabavazawelen.pdfIn PDF document text
    • http://kag.fr/userfiles/file/66093960054.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/gokikeditipoxepuse.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/60783930008.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/xowotenudimiv.pdfIn PDF document text
    • https://simbhaolipower.com/images/file/11470686502.pdfIn PDF document text
    • http://wawa757.com/uploads/files/5392883038.pdfIn PDF document text
    • https://mintowncoffee.net/uploads/images/files/gezexet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=apk+egg+incPDF 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_off0000d8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FE 18016 bytes
SHA-256: cd615d71e3bef382a8024baa779b193c08b020a2d19d15182c99492a7b507d63
font_01_sfnt_off00010841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10841 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12057 9928 bytes
SHA-256: 661e42f6fc922a2dffffec033411e5d073761c5db1c1007b0fe5cd8359d39e3e

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