Malicious PDF — malware analysis report

Static analysis result for SHA-256 eba8e2d51e85f2ef…

MALICIOUS

PDF

73.2 KB Created: 2021-09-11 03:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 34da6b93c3c6c4d2b0ca39f30b12d889 SHA-1: 7822da2925cba14acb3155b4227c7722676a7d09 SHA-256: eba8e2d51e85f2ef3fcfad3dd66aad41b5a36684d65c5e6ccf7b533faaccc6df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://www.retake.dk/ckfinder/userfiles/files/lunezexemenaf.pdf In PDF document text
    • https://arrayamed.com/userfiles/file/xatofajoxavanuzanisuvaj.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/613514d7a5e75.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/baxukelumesuwebakiwom.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/16115265875.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/23749914280.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/joroxodunal.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/161351063c3c33---56478861607.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/koxilomujab.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613033ccb7e8a---kasupal.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/9970888119.pdfIn PDF document text
    • http://lse.hu/userfiles/file/33894511475.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/silegowitizibawa.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/rewimosobi.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/9f78a40bc50ffd0101d8cb9bff0cd183/sodazawereze.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/xejikaziverulanavofu.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/zaxoperibediwufokepexir.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/vexado.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/9933611585.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/xulusunavulikalawa.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/40906352306.pdfIn PDF document text
    • http://grupophi.es/uploads/files/diromexupaxuvasosuna.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/pujurowasixevifolim.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/wobagefiwujibulutuxovom.pdfIn PDF document text
    • https://mimpishio.com/contents/files/niken.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/85451589984.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+print+only+certain+pages+of+a+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_off0000bd35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD35 15704 bytes
SHA-256: 8695bbd31c5482cd1a0db4b031cb2883ae777f719b44e8d851853e52ea0be207
font_01_sfnt_off0000e555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE555 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6C 10984 bytes
SHA-256: ef7c5377235eaa8d402ef493f3c16751dc99d7ac73f28d2d3b07e8b43bf3ca9c