Malicious PDF — malware analysis report

Static analysis result for SHA-256 a338f2f08523618e…

MALICIOUS

PDF

69.2 KB Created: 2021-09-26 01:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 154f6a822a43fb02793321f699bef075 SHA-1: ebcb62d9bd261d67c8e851463393f5e4c9778532 SHA-256: a338f2f08523618e5d018c2e45c242b749f492f190acbb972429b9736f4f5ed1
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various websites, many of which appear to be compromised WordPress installations or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/828c4f960811f858438ac0f224407b21/nonefatodopobozowafiw.pdf In PDF document text
    • http://rent2day.ca/ci2/userfiles/files/84224827253.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/64345903600.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/66995339594.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/19157562213.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/7b964031b35fc5b62b65f188ce006f41/dufisatepibomegax.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/bff3a4d8062545e2481da6651b40db57/livilubalexunejadigunebub.pdfIn PDF document text
    • https://sinarwaja.com/account/files/zokowuzi.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/9c499e173637b266a59a346a02f2d43f/xasosuverubufadajofameti.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/3480604686.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/vafigilam.pdfIn PDF document text
    • http://feg.vn/uploads/files/59014129742.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/nonaxafij.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/sijevokokelesumovilod.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/81827617054.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161307dd241b07---84576808686.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/lubixikekuwipavez.pdfIn PDF document text
    • http://hospitalityroyal.com/upload_files/file/81742727368.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614b60780eb9a---12520765799.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/12131308260.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/2878973199.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/36521683935.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/gitibaxilokamizumop.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/42836056902.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/12837198251.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=android+send+notification+from+servicePDF 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_off0000b010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB010 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC827 10640 bytes
SHA-256: 711242e77c0ee4b9817b06941ed7d6e710d69049f1e83ba55d694c7dae89fa20
font_02_sfnt_off0000e08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08F 15504 bytes
SHA-256: 2d21d5c7748866f42ddb6750f004748bf223e935e7a2fd0ade0ba8cb24854c95