Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac36266fedd5704…

MALICIOUS

PDF

99.0 KB Created: 2021-09-07 02:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a3a2180d90a3edd23dda3ca54b654220 SHA-1: 688666323a51f4c823323f80e81a90e4e1faf920 SHA-256: 4ac36266fedd57040f343419e868bd531a17753373d78448613495224ec35ca9
156 Risk Score

Malware Insights

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

This PDF file was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It contains a link farm pointing to multiple URLs, many of which are hosted on compromised WordPress sites, suggesting an attempt to lure users to malicious content. The presence of external URIs and link farms indicates a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9784

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://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/f899c3f318c0b0fcbe014640483d9eeb/nafevutoroxewok.pdf In PDF document text
    • http://firegallery.ru/img/upload/kelusixawug.pdfIn PDF document text
    • http://minipit.com/data/files/zuzilezotefekokom.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/76b49bb38563351d0ec851379c71f349/kowolapegi.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27ac4148ce---15111722391.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/xemefazibonijifuj.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/nuputum.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/75b37ac0e51435a3346b06c50e32c858/muderofutoret.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8302afda2---14934048168.pdfIn PDF document text
    • https://schmitz.cz/res/file/divakelegexawekudo.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/0vavqqposoulskq77dnhsft82q/66804604536.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/kuvofowadenijibavixajeki.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610d7fa733573---repuwutitux.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/61598691570.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/438npq8q795647fbghgbqaqpm3/vubotobopamejupaf.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/e619beeb0abbab5b836980d335fe5600/wopizenowogajajolonun.pdfIn PDF document text
    • http://brukbet.com/user_images/file/silagogozujizanudupe.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/kaselekumudagexavodun.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f534f377f---86116356009.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d0f789e4a---magogupim.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/jikonizulijuputufoderapa.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/49653747456.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/midadesobu.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/64499349480.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/82325034723.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/juranipujowizudelogupigot.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/jabunuzatoziregubupitim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=kuhn+rikon+pressure+cooker+instruction+manualPDF 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_off00011673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11673 20732 bytes
SHA-256: b369bbf0cdc461ec610ec150a557538a75fc24e9b841dd3d789318e806fe809d
font_01_sfnt_off00014d41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16558 10824 bytes
SHA-256: 4d007b73fa572fc636748c8b5fd0a3985de80513d31f16b453d45bf8b1db7180