Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ee190d3cdbd23b…

MALICIOUS

PDF

104.1 KB Created: 2021-09-07 15:20:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ab0da6d3ef6f97835af059123ac827e1 SHA-1: 2fdcee3b11f4d9a62778cc2d7101598851c8ed7b SHA-256: 81ee190d3cdbd23be65dcd95821cfa002304cf66adc57bae1a1f93e94f586e09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting domains. These links are likely intended to lure users into downloading further malicious content or visiting phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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.
  • 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://archism.ru/uplcv?utm_term=lady+in+waiting+full+pdf+free+download PDF link annotation
    • http://utuin.net/files/fckeditor/file/kibodiravevekidazepolama.pdfIn PDF document text
    • http://cn-noah.com/uploadfile/file/54178028967.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5430a70f9---84421818042.pdfIn PDF document text
    • https://pellevah.com/upload/files/rubopevivukerirenoge.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/687891653036c77e97f8c88fab04d97e/66331075038.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/79395113023.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/47778456058.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/2a747a1e971675f411bbaa4a6400e97b/45993491661.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/38673842778.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/kutigakafemaki.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844212a045b---kemasitamumalo.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/92199091712.pdfIn PDF document text
    • https://architektor.ru/uploads/file/xirer.pdfIn PDF document text
    • http://pneusmarene.it/images/file/mogakiwem.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/6abe7fbc1cf8086031a2abd7e063d7c0/gafuxawupisawawekelumok.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/gupasodejeronofisawapap.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/du646aavbqvha1koj1pd86qkqo/wuxakorifazun.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/geririma.pdfIn PDF document text
    • https://manenshop.com/upload/files/77345569805.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608397d733c70---93921469297.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/murenidasojaruwuxowekexeg.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd49a1a81b---29756390908.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/tavavavag.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbcb9467eb---1295595210.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_off00012f0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0E 19360 bytes
SHA-256: c558c30cdfc366f7c3b8cb55031319ec7288cd3580e0ca2af87c360c0b77b90b
font_01_sfnt_off00016150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16150 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17967 10764 bytes
SHA-256: e379b36e90ec138fb83593a36d3833bb442f1cf7ebb7ef59210e0e30ced3f17e

Open this report in the interactive analyzer, or submit your own file for analysis.