Malicious PDF — malware analysis report

Static analysis result for SHA-256 2368ed8ac523d0b6…

MALICIOUS

PDF

78.2 KB Created: 2021-09-08 08:01:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1af4ae4f0d5c4f2e98d4f17fd4a69c48 SHA-1: a4c22fce946ab23b40621936bbd1e2ef0bdf01d5 SHA-256: 2368ed8ac523d0b61488945d49ab81cb85ebd6a3f851f528bac6bb0dc72c3458
156 Risk Score

Malware Insights

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

This PDF 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 other disposable hosting domains. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://queure.ru/uplcv?utm_term=phrases+noun+practice+worksheet PDF link annotation
    • http://phone-server.com/userfiles/file/dazegajerol.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926b7c25ed9---kelomapulonifuluso.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/77175120d683837b878b336ea527c046/10639200622.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/38819178363.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d876acb6010---jukupulabutujezagiju.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/72882194446.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///rapidez.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1b2f94817---25375911637.pdfIn PDF document text
    • https://htchninc.com/d/files/65023544411.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/pakubekunus.pdfIn PDF document text
    • http://www.amanuttarakhand.org/ckfinder/userfiles/files/polulifipadatulonu.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/e63bd09ecb53e2be22d2f826225f6763/gufotin.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160adb7f548053---tesivumavojizugipufig.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/91535235306.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073239b1a203---99932604390.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/52165816937.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/sijuv.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/47222928717.pdfIn PDF document text
    • http://orderkai.com/uploads/files/lumuwotakutoti.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/860c8d7d5e79718798e368c127128147/38071871879.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/678cd49708492d11c14b9ebff325bb11/92411996014.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/23qb5q2goo6tnefro43o0gcb4c/60653243705.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_off0000c75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC75A 20444 bytes
SHA-256: f838af047b39ce26565d1b6f963feb2aa0020515967dcbad797baff97885a5ba
font_01_sfnt_off0000fa89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A0 10704 bytes
SHA-256: fcd55297f96d4239861aa76fc67d1a6982514d3d726e5b7f45b987ce414f3284

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