Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce12c7fbc09dc1f3…

MALICIOUS

PDF

74.5 KB Created: 2021-09-03 10:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 65d612e83c8a53e45bc8e54a26cc38de SHA-1: c489738c7626588e7e76cf5edf3512bc85d9781e SHA-256: ce12c7fbc09dc1f3f6529598fa520c1c07da0421431dc13839992d6db4187faf
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a link farm pointing to multiple domains, including compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The primary attack pattern involves directing users to external URLs via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://krisoc.ru/uplcv?utm_term=section+375+of+ipc+pdf PDF link annotation
    • http://wooshin.kr/uploaded/file/129270780260be17ec6ce55.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/6358084079.pdfIn PDF document text
    • http://veitali.com/upload/files/11100206829.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/kukekokigoxonazenulewu.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ef25b6b86---189695669.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7229589185.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/pomudepusebelezatudajen.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/j7evlo68j9sermr36nr6svcd4g/39891341258.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/gejutifovejarugusesobinuw.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/xirupurenusuzotamogoji.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/jupojogivezifo.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/27700801407.pdfIn PDF document text
    • https://termofriz.rs//files/sojikefanarabikuf.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/34851969000.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1ca3b6de6---21770269366.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/putozi.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/68192563910.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/850e6fd84bdce8cd9e547b07f8e52b7c/wugorolulanutuj.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3a04724e1---nobebubibata.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da7d0873957---63343690215.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160f67aeb30d39---7835296924.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_off0000c157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC157 10568 bytes
SHA-256: 2f580864caf9ed22ed688e1712d650d96c8a2f7b5ada357ea71874a31888bc62
font_01_sfnt_off0000d9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A3 16832 bytes
SHA-256: 7cc9d1bb3ec9dfa5cd4ad48fd7db4d0c1cd7b55b11ed5b6670cb172eb9f655e7
font_02_sfnt_off000104f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1