Malicious PDF — malware analysis report

Static analysis result for SHA-256 8251d9ae7a05a727…

MALICIOUS

PDF

72.0 KB Created: 2021-09-04 13:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e375b127d0e4e0e92fbd34d1bd53c1b1 SHA-1: 01229fe46eb4b0f522f4b2a5d88446fa4eeb8b05 SHA-256: 8251d9ae7a05a72706c903745ce835f56754be4bd530c5c0a9bb6919e892a43a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to numerous compromised websites and disposable hosting, suggesting an attempt to distribute phishing content or malware. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 http://truthtube.com/UserFiles/file/99245961642.pdf In PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/09c4090eb7992986e99f25d1f63dc7f5/nedugisesuxebalubakumi.pdfIn PDF document text
    • http://allycatering.com/userfiles/litopanogurijegazivume.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/5b2ff59ea81708152f097acb461af43b/wesemimuxuwumuz.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/2656852421bfb526a6ca32b574959fc3/49478619591.pdfIn PDF document text
    • https://birudongker.com/contents//files/xidujujapesirumajowawug.pdfIn PDF document text
    • http://ort168.com/upload//ckeditor/files/jiwidanimujuzikupokufune.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070894e1a71e---jusofakawubidigenubotigu.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210704072856472318791.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/wijozolonojogot.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/35061274104.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/jemoketavireke.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/cnc443rvtbabnqj4hi2rgnvkg4/49298969610.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/4e63d996ee7a6788945c2dcb09d01adf/91823709435.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/nomulixewa.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074133d61ff7---38390077453.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/64396201397.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/xofozenaxasepizoneluzuwe.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608879be7dd04---giwikarovakiminoditi.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608482e79171b---30871555095.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/kukisisulapijiraxo.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/abnnsbs6e5e456ejoa59ouf8nk/mowawagomuruva.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/97732376089.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/wilanugojakewebamakeka.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/7bce319284e3621560ad6993146d597a/10847851901.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/38169477075.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=guia+practica+de+piscicultura+en+colombia+pdfPDF 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_off0000badb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBADB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2ED 14900 bytes
SHA-256: 67645917e123f9098c1033932ff0ddee34d612485c4984519406fd3f0eb24cdf
font_02_sfnt_off0000f7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D8 11060 bytes
SHA-256: 5292e1120aaf6f2f087fc9b0135c9220f065e417fbe316c1ef6057d5b54fb2da