Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f6eca3cece887dc…

MALICIOUS

PDF

91.5 KB Created: 2021-08-09 08:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 18c5f4e5538c4cd08875c24fe2e08672 SHA-1: acaaeeb097d93d70e33e6e248f6d456aad6c7c1a SHA-256: 5f6eca3cece887dc647fe3a3703cdcf08f396ac8823eadcfc42777cbdc5e17a9
124 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm. The ClamAV detection as 'Pdf.Phishing.Trojan' suggests a malicious intent, likely to lure users to phishing sites or potentially exploit vulnerabilities. The presence of numerous distinct hosts and the use of UTM parameters in some URLs further support the link farm and potential phishing or SEO manipulation motive.

Machine Learning

  • Nyx PDF Classifier clean score 0.1405

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 http://konemara.hu/userfiles/file/renulomub.pdf In PDF document text
    • http://intestinalfortitude.org/clients/0/0c/0cf504f131cb0201443a7bd449519f4a/File/71649680249.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/gemobukipupilixizevesaji.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210623_170231.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/4u0q311f3h9031vqcrkg5n35dn/tusodajosofajaf.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/nafurelorerib.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/49079341196.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/48d3f9b205a7155897773e5847fec291/69716378794.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be93bd9f5d3---siwifaku.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/vovitifa.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/18667508809.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/56827306810.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161025f4d0776a---libojemujawav.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/106lg3rcv8edb67qrjicuu7k0m/ratesokatedosiviw.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b03b308e76c---wosepolepitilulopenus.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/c65331236b8f09e3fc500de818c7f005/kurejixopuwabatevi.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2defca739---96043455105.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a22f6227d---41731940783.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/gamulumuxejegar.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/438d7c89719d4a64778e0e01a0dbbe93/rawabobonevogo.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021080703480173499.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f279decbd18---sejojikolaporoboluwozoli.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d03532472de---70434375460.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/muneju.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6d040eee1---xijekejaxal.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/5gnmbhaah966l5hjkecj8jquv2/peluvosu.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/59447133930.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=adobe+acrobat+professional+7+free+download+full+version+for+windows+10PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C57 11208 bytes
SHA-256: 51d1ae22330217a419b4289a811dc56f65ea34115a325533587e740f1a6ab471
font_01_sfnt_off000146a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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