Malicious PDF — malware analysis report

Static analysis result for SHA-256 96639b6d18222a70…

MALICIOUS

PDF

87.3 KB Created: 2021-07-14 00:42:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7792199664b0415cf7fe90d01b7f6b79 SHA-1: f5a5ce29e4a487e69a41d69779a08ab876481e2d SHA-256: 96639b6d18222a70ab7bdd063565c2698de165d7bd71ac0c7a1123b2c38f868f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Analysis reveals it functions as a link farm, with numerous URLs pointing to files hosted on compromised CMS platforms, likely intended to lure users into downloading further malicious content. The presence of multiple external URIs and a link farm structure strongly suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://jagominum.com/contents//files/mizuluvo.pdf In PDF document text
    • http://alacarte-grafik.de/userfiles/file/zalomud.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a454d5f0a---munagarivepuw.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099b11562736---8967102621.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/cd95b91677ae9decc85f4a1477396846/21668517119.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/420dfdedc77429373a9eac16e6e0e181/faduwisuposap.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/jogete.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797a4cebbf0---rufajevuriwive.pdfIn PDF document text
    • http://biotledlight.com/userfiles/file///8837470407.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/bbfb74401f9e9902503af0b9932b5657/ramutix.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e590b207e---44903239035.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/munalojijigire.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076923fd3c23---wuvomedunabepag.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/xajefone.pdfIn PDF document text
    • http://tuccifamilyonline.com/clients/b/b5/b5aed9f4ae8fd2b300021b46b426cae6/File/63096436113.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/31c37b006b3102b7b1ed869e470c122e/650667581.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/9013951718.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/79375404554.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/22304999408.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c083e174296---wotok.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/30805080993.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/ed08e38381541da16e87e90f1edd6fbf/90966629229.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e62f33929---nizokafofebudedexubobuvu.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a952926b588---74539207590.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/fiporejovifi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=pdf+of+english+grammar+by+wren+and+martinPDF 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_off0000ef59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF59 11144 bytes
SHA-256: dd32103d63c863aafa4952b319aee3d6af12855d90b19ec6281b6e5434e33489
font_01_sfnt_off00010908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10908 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001211a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211A 17720 bytes
SHA-256: 7d4247e2260d8a252659a6d55e8f345b33d5dc36897953cfa5f27f5c3bbac02a