Malicious PDF — malware analysis report

Static analysis result for SHA-256 50c61c3eb73f7102…

MALICIOUS

PDF

71.4 KB Created: 2021-09-01 10:11:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 84b085e8a7d0c249da08bed7fcf888e4 SHA-1: 4a0b8245690cb4d3a5bbf05d07dfd79e031af295 SHA-256: 50c61c3eb73f7102baec25d825238762f30a04aa4619db8076a2c89dddaba259
154 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous URLs, many pointing to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URI links and compromised CMS upload links suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9898

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://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/6aa37f30c92b8e5994eff06eeb56af15/60623659826.pdf In PDF document text
    • http://royalgoodviewresort.com/Uploads/file/fupiwivawesorivokigel.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210605_A86614FD7BE7A4F3.pdfIn PDF document text
    • https://ikima.fr/uploads/file/teposimezepef.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bea6d7056ad---89560350566.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/86022430350.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/pesedejapegixutegirizoxa.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e18911dec9---25409883.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/99c72e2c34082af2e8f6d2dcc762aef0/70762130238.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e2a3245b4---99090316118.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/refotovujukakarosokera.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bccd11edb5---punasepaboragepibow.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/58882601945.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/70859660088.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/sojekakuvulowumexasadaw.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/nukivatov.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e273a338661---repugogowik.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/muwilifenajavuxidunusan.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc30c1a596---74992182038.pdfIn PDF document text
    • https://agatanorek.com/files/file/25568868173.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/98042473233.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/28105210389.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/9678028477.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=boy+skins+for+minecraft+pe+downloadPDF link annotation
    • 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_off0000c309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC309 16228 bytes
SHA-256: e5cac269d54f17d4accd87470f9238815f24b2943e582b23b6911e6a0b18c9de
font_01_sfnt_off0000eccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCB 11128 bytes
SHA-256: c0399934c11f0f6524872796fb6575576b08825dd49ed9aaff90a4a86dd1f624
font_02_sfnt_off000106e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1