Malicious PDF — malware analysis report

Static analysis result for SHA-256 de588ec479daabf1…

MALICIOUS

PDF

89.4 KB Created: 2021-09-08 13:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 65688f51d45dde7af6ec5d76a80c7a5a SHA-1: 3688d8c932a9092ddeb6b1c9b8b9e34b347809c9 SHA-256: de588ec479daabf13e9e5c8f6a74ad0eeb7a6ec6dd757bab15ddd99904cfb1ea
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to potentially compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript (T1059.007) indicates the potential for client-side exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://print-resource.co.uk/ckfinder/userfiles/files/44205533889.pdf In PDF document text
    • http://confidenzacsapagy.hu/upload/ketudu.pdfIn PDF document text
    • http://siamintertrade.com/file_media/file_image/file/totaxovujorigakeven.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/mipibeluwufalotitisafotev.pdfIn PDF document text
    • https://anakmeong.com/contents/files/pugonuvanipimifobimazalup.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/suwibiluninezo.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/nujivovamufug.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16130230f7f2c4---kunulezoxi.pdfIn PDF document text
    • http://herve-coiffure.ci/files/zeretamosopofalaxomo.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vowodivoverep.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/72837236791.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/lozagurokuditizizu.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/87637207756.pdfIn PDF document text
    • http://maihome.hu/admin1/file/komupusazajis.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/sozeserivugavulefopi.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/xalir.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/tubapose.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/4e7ee5238099eeec70d4706b45f6b8f8/jodotagurujiwolora.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/jevinis.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/doxetulekitigufemaxigut.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/fagukekukula.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/29088561300.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/1413998414.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/1b1ca6507259794a7d56f3a822c1a8f0/41254238886.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=pdf+management+sciencePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73C 10556 bytes
SHA-256: be1731e523e555a2d324cdf30d3ff9a39109098c5a3fdfd86580a4455b0d69ff
font_01_sfnt_off0000ef17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF17 16228 bytes
SHA-256: 6de2e4de3e01fd5ed443d1209e1dacf3a9d2e38faa1ffa722a59a0423b67245f
font_02_sfnt_off000104f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D03 23232 bytes
SHA-256: 1015b5a9fa645167492db004ce04a63a47982ca1e6c09d12bc07002efaba0cc1

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