Malicious PDF — malware analysis report

Static analysis result for SHA-256 262522ea1f701a31…

MALICIOUS

PDF

79.7 KB Created: 2021-09-05 22:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 39106d9ce7ec5e366f22e6db70e2b5fa SHA-1: 271e49c2a621e7951b4d687ec7412ce90637c927 SHA-256: 262522ea1f701a31de56f327ae8da5000fee11a46a6fc4a7e204810e9c3f985b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. The file contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting it's designed to redirect users to malicious content or phishing sites. The presence of embedded JavaScript indicates an attempt to execute code within the user's browser, likely to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://huntic.ru/uplcv?utm_term=rift+valley+institute+of+science+and+technology+courses+pdf PDF link annotation
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/52fe5052c409c474be72b1cd8516d4f3/retajikifinele.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/92584635191.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085762f2a9b7---45948993383.pdfIn PDF document text
    • http://midlandhigh65.com/clients/6/68/682e31fde28f8c6bff7ebba57332ef5f/File/82183578781.pdfIn PDF document text
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/0da99206aad55ed3d3e0f6bfc4ea6260/tezawuxurekenawiz.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/47139886084.pdfIn PDF document text
    • http://albertaracecar.ca/clients/49797/File/dezurike.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/wedajejinebunegadukikit.pdfIn PDF document text
    • https://local-atlas.ru/userfiles/files/6068531024.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609827157440b---xozinabenoxepexotot.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/a3md1giu4fa6120t5ll2i12vls/moligizoxixuwigogivupev.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/wopozifekotesowerune.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/5ulmur93spr2b7en9hoemeq1c5/gixokoruzafofif.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/mezoroxabidilifow.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/luxikigubewometuz.pdfIn PDF document text
    • http://findplusltd.com/file/kapepofibatabagutomudinem.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/57799717227.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/siwiriferuxamuvivev.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/2cd3418c6c2d59baee85c51575f1402f/todezutuj.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/04639682cf7f297194b21f3bf3aa4865/29801517416.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b96202396---musadapuxibezinar.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc7149ad5a---folobogoxititot.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c28d98396d6---25786640320.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/92131621557.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/75c377e1063bdd62c182376cccd9e818/wesujuvixojoriwe.pdfIn PDF document text
    • https://vansuloi.com/uploads/userfiles/file/vuwufuxobajoragu.pdfIn PDF document text
    • 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_off0000d226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD226 17048 bytes
SHA-256: 7316bcea0f04c74143f26c8fef81e91d659d9cd383eac12d8c8666951dff213e
font_01_sfnt_off0000fe10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE10 11224 bytes
SHA-256: 5bf02fc575bb68ae477545adf05f53bd22c510a6edd0637fcf35e821d0f79e3e
font_02_sfnt_off0001182a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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