Malicious PDF — malware analysis report

Static analysis result for SHA-256 18e21d4e965e68b2…

MALICIOUS

PDF

77.6 KB Created: 2021-09-12 19:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 48509e76d574f25bc619b588df83fe48 SHA-1: cbb373e7641f921bc35ca6a05c32d5fc8fcf18e6 SHA-256: 18e21d4e965e68b2402b3aeb448722650034c724d4dfbb798bf013ed101540a9
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and contains numerous links to external websites, many hosted on compromised WordPress installations. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the overall structure point towards a spearphishing attachment designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4212

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://crysiq.ru/uplcv?utm_term=handmaids+tale+free+pdf PDF link annotation
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/4ur9hj8fbpqd0h0dl9kjfh5tu8/43004570426.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16130ad5b2691e---95498990922.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/nolakumo.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210911023055.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/falekotovezafotutupono.pdfIn PDF document text
    • http://espicycooking.com/files/file///mowoxosafowita.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-12/20210912202651806774.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/zevuzezew.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/rusivufosebanoxawegux.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/rajexineboxij.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/pamisinejitasinuwurila.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/l1sj9ook83haqd856k1ccp813r/mebaxav.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/23356320545.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec6ff58b39---betopedakuxumedaxafoxi.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/7022669939.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/zudamejepiretuliwof.pdfIn PDF document text
    • https://atrax.hr/files/jupakuvujosikobevazud.pdfIn PDF document text
    • http://xhzhengli.com/upload/51710698414.pdfIn PDF document text
    • http://shamayachts.com/upload/file/92972101132.pdfIn PDF document text
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/8937081214.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/ribizenu.pdfIn PDF document text
    • http://cissi.it/userfiles/files/9659907875.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/sutafonibab.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_off0000ddd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD7 16852 bytes
SHA-256: 8a531e3d1cce50369433b145bcd9da6b112aec7c7d5f1513578ceb5fe607ba29
font_01_sfnt_off00010995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10995 10528 bytes
SHA-256: c72b9baf9ba54ae3ae4f7d38834d286bd1694bc03ef20981a30695a3773f1022
font_02_sfnt_off00012168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12168 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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