Malicious PDF — malware analysis report

Static analysis result for SHA-256 00d8121c5a3b72bc…

MALICIOUS

PDF

85.9 KB Created: 2021-09-06 02:27:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a308741e964c07037f092df348d93c15 SHA-1: 8b0404beef530fcf17702ea31e824164d3de0604 SHA-256: 00d8121c5a3b72bc5b27eabf7c95b024c6485961c5f2cf83f859e93da987e7df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=difference+between+counselling+and+psychotherapy+pdf PDF link annotation
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/46101603606.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876f6eaec33---9809685337.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/reveniwutabuxakatoj.pdfIn PDF document text
    • https://terracell.pt/images/file/junavawifi.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160716b4ee9bf4---subujilabuxegose.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/93889190062.pdfIn PDF document text
    • http://rivieahk.com/clients/5/51/51325344bd1517f257d6959d5350918e/File/zovenegopedubofu.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/s7t8cn2pbsg8af4fpfei8uhe85/55763949666.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/nubomunijixuvab.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/cc7bed43d045ac631845a6318f59abea/gavafamajipizunuzofegigi.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/zopujagomifas.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/1rs5u1v75n8lr8rdibkcmbrpnc/64879047989.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c8dcbc19a2---gotupukumeso.pdfIn PDF document text
    • http://border-inn.com/CKEdit/upload/files/dadavolupepewegutarutemij.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/notafemawibuvanodusimamib.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/82723229803.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/zarefusixaxabelitofilomer.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c18a85d1c---merisurovekifame.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/xiruvijovoderovupe.pdfIn PDF document text
    • https://myhoteltrip.com/userfiles/file/32825052656.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/sewigulozedaju.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfb034960b2---32958831561.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1606f580f146f4---binovivumiputerovisimolu.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/a840236af5bf7460ffa83a29271a297e/tomaxuregigoxekomiwulu.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_off0000e9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B6 11340 bytes
SHA-256: 6bc319df4ba9e3dd32c5828a06d6569770f6b82d5af3a4532299944f990147fa
font_01_sfnt_off00010407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10407 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C19 17500 bytes
SHA-256: aa4a84836f48f4ce0dca0e746bc5a1b607f48d5f81bec315f8173f4080caa342