Malicious PDF — malware analysis report

Static analysis result for SHA-256 78b98f4b9ed804ee…

MALICIOUS

PDF

84.3 KB Created: 2021-08-01 08:35:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b9351d1d156f38f049a528b1e5e47209 SHA-1: 36471456f12f48f1b25da44e60c2f3f220850bd5 SHA-256: 78b98f4b9ed804eec68f00d4bdfeca3f9e86a300f17d4e1b121779678e9473f9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, indicated by the presence of a link farm pointing to multiple distinct hosts. The embedded JavaScript stream, though not fully analyzed due to obfuscation, likely contributes to the malicious functionality. The ClamAV detection and ML classifier further support its classification as malicious, likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://beateromer.com/bilder/file/tuliripuzi.pdf In PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/7eddaf80d18d342451c978dc00008087/tusoto.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/20550460980.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/diwewodewexugelokemel.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084767e53d3d---dovovejowip.pdfIn PDF document text
    • http://aps-mes.com/files/file/vezoxosamoma.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849341924a0---7036405178.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/29390226235.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/sexivaguditozamizivimo.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/kejulavepovut.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/bemubosi.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/c4fecdd7e73a112e68f98387d03fa0b6/20511492239.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/xuxolubekepiz.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/lkld4llepaclru24afhu7emj20/1548258007.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/4f41d25434e9b785df196f30f40b7af5/zijenatebu.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a184a324d1e---94779583173.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/zaritiridovoloxis.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ef4f96349---fomubasugalifas.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/72506980553.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/56181490418.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9a7b9a1cb---potowu.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/72738889602.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=carrom+pool+mod+hack+apk+downloadPDF 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_off0000e74b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF62 10496 bytes
SHA-256: e48d637fc4d14221c8cc6e3acc1f204e195189a8fc16600c78604012526dcf2d
font_02_sfnt_off00011711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11711 17068 bytes
SHA-256: d7bf4ae531f3ef8e0bee2b39220533c948cef00541e3de956e4da094637d5bf5

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