Malicious PDF — malware analysis report

Static analysis result for SHA-256 24bbc2708e2cad50…

MALICIOUS

PDF

87.4 KB Created: 2021-08-09 11:29:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ec9df2a013a1a91c0a9976aeb0c25168 SHA-1: c59961eb48fee6a0c1c5239c79d55d478c09b62b SHA-256: 24bbc2708e2cad50fbe46a7e1133afdfe4d5f6757f6b318bb860b722aa303826
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, likely intended to redirect users to malicious content or phishing pages. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7598

Heuristics 5

  • 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
  • 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://pixomot.ru/uplcv?utm_term=how+to+find+someone+on+meetme PDF link annotation
    • http://deryalvincotokurtarma.com/userfiles/file/mibedajagirevesitej.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/6470268828.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/jotuwewejixejozunadapaxuv.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfe25e531e---94263518077.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/89177885726.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/37068550567bc3bc3415310d948a3afb/vofevuxotaxi.pdfIn PDF document text
    • https://btegypt.com/file/25930377717.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1610a2cb1155cd---86685849981.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/f1gqh0uk60rhtnn7urda86vc7f/72973931378.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/2985b2146011bfa34709a002fdaca831/26678357913.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/tejujaxifumebiv.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/gedenopunuvix.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/belemoligidovikezubajolif.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/1236a86ee7358da211da88b62a397a7c/74598329747.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/66816543915.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/foranirodozepavogozotu.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/jiwobuwagukutuni.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/ziwesujavinetil.pdfIn PDF document text
    • http://www.sanruou.com/app/webroot/uploads/files/satelivajijitobitixugafop.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/26632098005.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/zikazifagagozurosam.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/fafilapirug.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/41445333446.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/b559192c714b61040ab4dab71a7a2b23/44025855682.pdfIn 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_off0000eec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC9 16680 bytes
SHA-256: 3c3e7d6ade04958cfbea21299068071ceea9f8437ed1469117f33a9c28b3d02d
font_01_sfnt_off00010612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10612 19892 bytes
SHA-256: d11af1d9a36f9925cd4615fa1463166026e51e5feaeb8b5f9324f425786ce8e9
font_02_sfnt_off00013986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13986 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1