Malicious PDF — malware analysis report

Static analysis result for SHA-256 3db71dcd1ecb365d…

MALICIOUS

PDF

76.1 KB Created: 2021-09-12 13:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c90767fff7c29cbe379c0e5142400f24 SHA-1: cce9c0f7ac752ffd93d2d91ae81dc7f6fc59da36 SHA-256: 3db71dcd1ecb365d5ae38b1f2d09ef9c3047a043c0f227cddf303cb9aa680a1b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The file also functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. These links likely serve as lures for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://ataru.site/js/ckfinder/userfiles/files/kigivulogizojakitobuwu.pdf In PDF document text
    • http://kapsalonvogue.nl/files/file/64779538740.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/gitimezeloru.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/fa5315eee000c350b719ee074042b0e6/24594194713.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/xifanasexiberuwumutu.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/71244656779.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4cb6a09a9---87496259164.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/xosegasejozeliparatajigax.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/tazovuxoduvezuronalodese.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/novebirekelibowe.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f722ac3d6---foxibupegemoxuzoxuganox.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134dd193985b---doninisowusaruvejujeguk.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/davc9lo86pm919jbdg1ii61b74/79092139407.pdfIn PDF document text
    • https://derfo.info/resimler/files/warugijuremukekakutumeka.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/merusasemowu.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/kijugegekob.pdfIn PDF document text
    • http://dafangtour.com/fckeditor/userimages/file/16334256993.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/zetuv.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/lajamuwuzibuve.pdfIn PDF document text
    • https://777mto.info/contents/files/kizabe.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/pozopebajibebaxerur.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/87049832292.pdfIn PDF document text
    • http://accronline.com/userfiles/file/87006708526.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=hex+hacking+simulatorPDF 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_off0000c2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C0 10960 bytes
SHA-256: 9ef2607621f8d0079c51722e7f2333c23c87c1837799a1551af58631e87fff3f
font_01_sfnt_off0000dbf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF8 17856 bytes
SHA-256: 8bc06c5aeef7269ce7efd553db24c1448b02e315e07ec47d79f58faf63e59687
font_02_sfnt_off00010b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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