Malicious PDF — malware analysis report

Static analysis result for SHA-256 b22232d7766a5f81…

MALICIOUS

PDF

63.7 KB Created: 2021-09-24 08:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2bb9c495e2aa83afbd23be25dda5787e SHA-1: 2a5004964bf4a0e0a59271c41637900360bca7bd SHA-256: b22232d7766a5f81c405b75c0c679107c59b30f18306618ebaa226f2bf901275
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating it likely serves a malicious purpose. It functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised CMS platforms. The presence of these links suggests an attempt to lure users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9183

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://rilta.net/userfiles/files/23015416974.pdf
    • http://dierenwinkelindex.nl/images/uploads/gexuxosunilemabewiziwuweg.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415dfa2b7bf---11826570612.pdf
    • https://alteanetworks.fr/img/file/xifexuwojowibefubesores.pdf
    • https://bahia-group.com/ckfinder/userfiles/files/doxagovidisawaxegajuv.pdf
    • http://bbmeti.it/userfiles/files/pajefopelubifujij.pdf
    • https://aaaxxion.info/images/file/94725545881.pdf
    • http://vit-physio.de/file/69930708363.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/cc6287471b1915c67f1f58ea8f743f25/26955234042.pdf
    • http://ukkies.be/userfiles/file/12620049712.pdf
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/30317328964.pdf
    • http://kadh.kr/bobod/upload/file/12598425002.pdf
    • http://ville-dammarie.com/ckfinder/userfiles/files/21697498190.pdf
    • http://acelybio.com/upload/files/vutevaxigenokokatapaniri.pdf
    • https://kristinanamaste.eu/files/96558404013.pdf
    • http://hsaltsj.com/uploads/files/24167715872.pdf
    • https://tempatpasang.com/contents/files/jutukorifagugubezisijoz.pdf
    • https://ibshospitals.com/userfiles/file/kewixajebatetimumoxafek.pdf
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/wazijegowibukiguza.pdf
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/vixizobepat.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/356d501d99d2e8f7ad55a48dc1d724b4/somusex.pdf
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/52677924168.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613a65bb8d05b---96334030337.pdf
    • https://ipic.vn/userfiles/file/rujajubij.pdf
    • https://greenways.at/userfiles/file/52565807946.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=golden+sun+ds+rom
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c65e.bin
0724caa7b86df522229760c143fc2e61fe2e87a8b34e74ea7c716e9ed294c25a
pdf-font-stream PDF embedded font (sfnt) at offset 0xC65E 17828 bytes