Malicious PDF — malware analysis report

Static analysis result for SHA-256 efabdcda85d27265…

MALICIOUS

PDF

83.1 KB Created: 2021-09-21 02:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b6e96d1a86e1ca62d15449adb8ecd70b SHA-1: 461fdb8d32cc330ed835fa342542c1bcd720ab79 SHA-256: efabdcda85d27265f9373d7dbd949537f506896d543751697745fe9290e253c9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to execute malicious code or redirect users. The presence of a link farm pointing to compromised WordPress uploads and disposable hosting further supports a phishing or malware distribution attack pattern. The embedded JavaScript likely facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://georgekoldun.com/var/upload/file/25922755178.pdf In PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/55845278876.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/63f1eaa6699c818fe318e96266ad818d/50828671635.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/61703184590.pdfIn PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/tavukijakukuxid.pdfIn PDF document text
    • http://haitrungkim.vn/uploads/userfiles/file/wefutovepixegitomunorulis.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613527b283011---3787237945.pdfIn PDF document text
    • http://geonatlife.es/ckfinder/userfiles/files/15201987254.pdfIn PDF document text
    • https://siltri.com/fck_upload/file/nefesaf.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/96873635516.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/sabezakemogubebaxebud.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/nanidufimiruxuwedixujow.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/muxowixew.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613c38d67325f---23067984433.pdfIn PDF document text
    • https://viktorina.ledoritulys.lt/files/11587847005.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/fosidakijizu.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/89659564881.pdfIn PDF document text
    • https://777mto.com/contents/files/sopejotajal.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/jogetikakosop.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/zegakatixate.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/neselulipij.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340c0a6858e---32868595217.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161392d29b923c---wiwalinojotid.pdfIn PDF document text
    • https://stvietnam.net/luutru/files/tomixovetaxuwepatewe.pdfIn PDF document text
    • http://ipublicity.cz/data/file/lovifatafogowasali.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/64533202055.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=meaning+of+111+angel+numberPDF 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_off0000e22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22B 17440 bytes
SHA-256: b055e67262312bcb47238fbaf5e5ea9e6efb1dbb6f04404ddd57fa940bd16add
font_01_sfnt_off00010e54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001266b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266B 10576 bytes
SHA-256: a32a6c6547b761d336caa1459d51e0d9938066c39487fd7d15782f70092c2850

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