Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f7b52c5f3cb2d85…

MALICIOUS

PDF

100.8 KB Created: 2021-08-01 02:29:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6be982f1485d2ae9df519ac5439c1de9 SHA-1: 8daa7b2dab162ab6ee86c4a80288fa28999b9e58 SHA-256: 8f7b52c5f3cb2d85e4a46ae8dd2c32912742f2c9673fcdbdf56d769f66f41cc6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites. The presence of external URI heuristics and link farm indicators suggests a phishing or redirection scheme designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://medvor.ru/uplcv?utm_term=bacardi+coconut+rum+nutrition+facts PDF link annotation
    • https://muguet.fr/sites/default/files/file/27719586911.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/rixufepanedawisa.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/58a042379e34e42d329814b8bde9af37/kizorixuwivazine.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/prbc4be1rqvfnnm4ei3vbf1ds6/35490028330.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/dkuuln43ajd0dklu6c1qo36ij0/40267761869.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aae17138bbd---16376943069.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/kedinatisumin.pdfIn PDF document text
    • http://ahchala.com/img/file/8260428229.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/3f1e07031afc0425da95f9a3deaab1d6/81728510772.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/93849433180.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/38085166482.pdfIn PDF document text
    • https://argumentua.com/i/file/pixiverogezumoredizude.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/c53d5d8f31120c665a748afbe3615570/jixoxegubodifutobul.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/tulix.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/pilalimiwunoripevigutemi.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/517091849.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/ebd207706d2d7ba7892098dd0fe4874f/vatatovavurikutojud.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075804f0e2a2---85444025029.pdfIn PDF document text
    • http://fairmonteast1978.com/clients/71195/File/mepowu.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/f016781d47e77c15a30c60bad2b9f731/petezubujitewovagu.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/f4b8960e8b284c1ea7a17368b254d957/47102820944.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f4eb0043f---85515406719.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/tvs81a8han05qm0eaisiglt997/rogeparo.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbec173763---kudiwaduxilokujasegaju.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_off000120b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000138cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138CB 10612 bytes
SHA-256: 3acb987cb0deecd1ff2e7e873d0da6205654105e7177810a168618f6b7475948
font_02_sfnt_off00015114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15114 19328 bytes
SHA-256: 4808527caa046f054a57c2d1e58699cd23caa449d6032014b01f6fed95f3f000

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