Malicious PDF — malware analysis report

Static analysis result for SHA-256 310cd285949dd0a7…

MALICIOUS

PDF

73.0 KB Created: 2021-09-19 09:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 23de3eaca5e8d5f2d6da59eb071ec8f4 SHA-1: adb7172b90ca3d8e5306f50ea68485b4fbd5752a SHA-256: 310cd285949dd0a7fd46e3d4f0689e04ffdafa7f232ce91fde4b9a49408b93ec
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The presence of embedded JavaScript and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a malicious intent, likely for phishing or distributing further malware. The ML classifier output of 0.997 further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=excel+bible+pdf PDF link annotation
    • http://secretinvitation.net/images/files/98282048060.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/75060678778.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/50832691003.pdfIn PDF document text
    • http://jonellchem.com/upload/files/99061034822.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ab3901d82---34969134528.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/xamuminejadonur.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/99790280527.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/63567969863.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/83409211788.pdfIn PDF document text
    • https://datajournonepal.org/files/9185130814.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/72605002287.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202109041930439361.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/tafotisimubenewituvegozi.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfa8fae08b---kerinitufez.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/xarudulobuwew.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2109191126563144300amzwd.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/10013435907.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/a35d7bb19e165860a72f58efad51bcad/30662262600.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/bivetitiradavere.pdfIn PDF document text
    • http://nasledie-sluck.by/var/upload/file/79248231775.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/35465658435.pdfIn PDF document text
    • http://eva.am/files/3c866ac824a573c7.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109062302179118.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/fidiguxefezo.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/86334882131.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_off0000bfa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA0 15856 bytes
SHA-256: 9455c0bdf6b8f139cc7da7279fb466cefbc6024cbd4373828d3c28a021071b8b
font_01_sfnt_off0000e7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFB 10088 bytes
SHA-256: c85dd8af349b002952e2f8abe4081973def27820714f5757d12b8161bf8cc300

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