Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9c7bb5cc24e349a…

MALICIOUS

PDF

69.6 KB Created: 2021-10-03 08:18:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c39439a27f4f399400632f681868fec1 SHA-1: eb5478cb914ba38368e380c9f79a515dba291aef SHA-256: c9c7bb5cc24e349a639382b37632883ecb146771c4b6336b22550c53bd4e1802
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple external URLs, many hosted on compromised CMS upload directories, suggesting an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://irlanc.ru/uplcv?utm_term=isbn+book+search PDF link annotation
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/0v83glus6vn0u7h2g3nddq7a7t/83292463839.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148662abacee---wunis.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/romiberujobudugenujam.pdfIn PDF document text
    • http://dison.cn/filespath/files/20210926125332.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/98567253583.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/jajuditutobipufe.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/58673314782.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/674522924.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/22715433141.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/21929802749.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/61989290460.pdfIn PDF document text
    • https://priscar.com/documents/files/9689265737.pdfIn PDF document text
    • http://nscenter.cn/upload/files/tujoniluzo.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153c37e89b17---bozigivib.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/wositapitetup.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/59701275491.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/32520877470.pdfIn PDF document text
    • http://anitacalderon.com/ckfinder/userfiles/files/41869743301.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1630518265.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/vijoxorugi.pdfIn PDF document text
    • https://whitesal.com/data/images/file/5196_20210910070155.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/nonotovile.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/32384232266.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/mugopagexeko.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de22f6a1fd---48356502650.pdfIn PDF document text
    • 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_off0000b127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB127 16052 bytes
SHA-256: 322eb5c1a907f10043346940392bb8f945583401a28139b545075908c139a8b9
font_01_sfnt_off0000da25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA25 10272 bytes
SHA-256: ffe0bd3ed4b52c3c39f1cdf55e90254bd8747d446c7b7b1c19f84d84c7588b11
font_02_sfnt_off0000f13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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