Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d6f174ef1892fb…

MALICIOUS

PDF

80.6 KB Created: 2021-09-09 23:34:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ececb9d99520d7f02589fea283472b31 SHA-1: 31b29840aae3469abd2ef05188553505daa40271 SHA-256: c4d6f174ef1892fbbbd66c4be4b6c4e6adedbd09ca328f03db6c3f145695eecf
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://topmebli.com/content/xuploadimages/file/47042576695.pdf In PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133217a2c253---89443088338.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/78655711934.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/vevavakilibeza.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/jibuzi.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/pevenodusefakidoti.pdfIn PDF document text
    • http://4darchitecture.org/img/all/bekeliwewemuratupap.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/62515244750.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/93607035364.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/bajasosetuzabiwax.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/59657106111.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/640fbafb57c8eb8b73c0d2e0b1f36baf/16365057305.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/jegebogora.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/29838081687.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/zirifojamavutuxewolutopaf.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/busenewurejupumopasezu.pdfIn PDF document text
    • https://maturana.cl/upload/file/6836693280.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/76781030423.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137abe5eff69---fabetunuwibezavoje.pdfIn PDF document text
    • http://tayles.com/uploaded/gamawe.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315f53b16ac---90066409877.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/winovaparebekifomafetukep.pdfIn PDF document text
    • https://maymac.info/userfiles/file/71670612396.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395acb45b90---wuboxotitonutumumaluj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=naruto+shippuden+ep+473PDF 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_off0000d64b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64B 17456 bytes
SHA-256: 367e27ac29375e721d26e3ee42edd3ba5eed300f93195ff744e1c608960c6d2b
font_01_sfnt_off00010372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10372 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B89 10820 bytes
SHA-256: 15981b027b7f78a02c3353e6f70ee5a60e0eeda4c1f4558db7074022c3c55939

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