Malicious PDF — malware analysis report

Static analysis result for SHA-256 c500776ccf6e37b5…

MALICIOUS

PDF

84.6 KB Created: 2021-08-20 17:32:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d48f2ef657afe85172eac1700b99b711 SHA-1: d801ef91ba687b7f2b303bb68f79e02679502c23 SHA-256: c500776ccf6e37b5fc8299f288aa39bb1174c8a56baddf1a1c7c31ee6a35c694
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users to malicious sites. The presence of a link farm pointing to multiple distinct hosts, many of which are compromised WordPress upload directories, further suggests an attempt to distribute malware or conduct phishing. The primary IOCs are the URLs associated with the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de194fcdd0d---bijitud.pdf In PDF document text
    • https://mintowncoffee.net/uploads/images/files/97118025480.pdfIn PDF document text
    • http://mwcapital.net//ckfinder/userfiles/files/kemetuteb.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/xeximigebizifedavesibomuk.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/zikuvotilagoke.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/7027040930.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/14369453504.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/bimakabivaxamasoso.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/60706799359.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/c4b164aa7518f76ea0fb9ba908b1a12c/tisikebozusuzoxorudalut.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/81579147900.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/21844515086.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/aaed35144edc925fad2ebc8031cecd54/wukomepanojidob.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2nget6c330vsj9juidmtctk7q0/xirenisozadasesavinufejo.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dceace8c07a---35386485978.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/jiwoweziwuv.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/27528452163.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/jedigeratopobazaj.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/zepirerasobatavalexegabuf.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/34c8e3dfffae6bbd096d3fae33ac74d0/44895061342.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cee999e0914---motop.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d988a9b26---xanotirus.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202108/file/72644493265.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/95323392213.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/abh6hhume8gp5jeia7s4lnsrt3/tijuvi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=teorema+de+la+m%C3%A1xima+transferencia+de+potencia+mediante+el+equivalente+de+nortonPDF link annotation
    • 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_off0000de59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66B 18924 bytes
SHA-256: af1ed0b5de2b1f57744ff7c74039fb59266bdd5620f7ff7e3e3a8c983d588c07
font_02_sfnt_off0001259f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259F 11340 bytes
SHA-256: 3c121ad53f1f193922d3548a9e1638e9f5e7a3ced59d5b711853dfc2a47f228d

Open this report in the interactive analyzer, or submit your own file for analysis.