Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b66ee74cb690a5b…

MALICIOUS

PDF

89.2 KB Created: 2021-07-20 04:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d419c2f14ac2c89495415552bc21ca03 SHA-1: 00899906ce9a9b768458a91772704c4ba1e2b444 SHA-256: 6b66ee74cb690a5bb0520badf1fbaa16b61b69e4bf008ea64972d718944b7ef4
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to potentially compromised WordPress uploads and disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead users to malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.aamuhsv-madisonalumni.org/files/files/wonegitikifiliwakawawe.pdf In PDF document text
    • https://discovercefalu.it/_data/images/file/75529806253.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/66238941796.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1d51ed0a8---xoletejirusunawuz.pdfIn PDF document text
    • http://midel.me/userfiles/file/kukurobebixazuru.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081e0cc3ed47---13208189892.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/kililebinuzisexegen.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/22f51c265beff208b9f99663324e1a03/59869522196.pdfIn PDF document text
    • https://aashianarealty.com/file/65066328951.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/wegewebol.pdfIn PDF document text
    • http://talleresjpg.es/img/file/vikapujibub.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/61497099480.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/eb7dcfec1b907c7f27000d860dba5699/juguxujamebofevalujofi.pdfIn PDF document text
    • https://wecareprogram.org/images/file/tiwudis.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/5831507879.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/5b95ef15b4d8ef5484722b0961f5fda0/dukemu.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210617161953.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/nexudinuv.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/2103729957.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/61c93aac5e8f47a88c574870c477f660/rokilavujekigavogorafanax.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/12307432406.pdfIn PDF document text
    • http://budka39.ru/files/malusidin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=education+is+more+important+today+than+ever+beforePDF 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_off0000f7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A1 17344 bytes
SHA-256: 805ca4a28e8afee7e43467c5983e8e0b76a46f2ee2b085121250a73248e95b56
font_01_sfnt_off00012541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12541 11240 bytes
SHA-256: c186bffe10323debcf495d48d05831ffd5d5f67e055c91c3ef382bc69b4b32e4
font_02_sfnt_off00013f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1