Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b688eed922b7a25…

MALICIOUS

PDF

84.0 KB Created: 2021-06-26 06:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0a9e0c114df6fcc29ceb865a5bfaa72e SHA-1: 64bc708785a85ed331048b1c5c846ab654cb04f5 SHA-256: 1b688eed922b7a2522c19a2c9ab9682ac384a9e5c40f7f7f1f3651b272a059a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains numerous links, many pointing to compromised websites or disposable hosting, forming a link farm. The primary purpose appears to be directing users to external malicious sites, likely for phishing or malware distribution, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://crysiq.ru/uplcv?utm_term=ultimate+douchebag+workout+2+cheats
    • http://hum-lucknow.org/test/fckeditor/file/xegisi.pdf
    • http://rld-carbon.ru/file/71067169991.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/ase2121kob8e2mo1a42flsfofs/boxufamuxu.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/5655551c314e224ae8c7c27e4de22a38/zidezinixamewomalax.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ca37a380e---25557878482.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/qc5l07oifq15ffenmkevriok4d/rosib.pdf
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/eca66735823ac7fd765ac8caaa0d692f/nulafenaxidazadetefesudux.pdf
    • http://toanlinh.vn/upload/files/liwubudotokelesovezugox.pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/30ef0f1b1624ab6c5628393bd4c0e100/17226487934.pdf
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/dgh47a9itg4voirq2eib5bf883/80073643403.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b321d747533---78304681292.pdf
    • http://mikailang.net/userfiles/file/20210508232242_1977781976.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a19961bb98---67572627739.pdf
    • http://hotelsandmartin.cz/files/file/31623698333.pdf
    • http://midel.me/userfiles/file/lufuz.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/8ebh8pk0vbks001aqschi4j0g6/mogopipedibepurenijor.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789b48f0617---17847402349.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073d8505f90d---17862843209.pdf
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/5a3613d31ecb2e717d1c0b79ca2d3ce2/fifilijajudokova.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/2493ca2c150103b4211dbd997d28ae29/97662315521.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7629f01259---2370512158.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/56b96aa76ede90cad9400e1d3268ff2b/25709444765.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a908cfa5921---kidovaso.pdf
    • http://elcampoeco.org/FCKeditor/file/48879136444.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3ac.bin
e5ba5b1890a5b790bb095e2a8cffbc4545081c85b03530b69aa9c0dcc46d9f4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AC 11256 bytes
font_01_sfnt_off0000fdf5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF5 16792 bytes
font_02_sfnt_off00011607.bin
ff811cede119d97bd9ac23c56cbbbe187b0d0f6f9a002fedb633983578fe50a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11607 16608 bytes

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