Malicious PDF — malware analysis report

Static analysis result for SHA-256 c42aa4cf2d931a08…

MALICIOUS

PDF

78.0 KB Created: 2021-09-16 11:34:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cd670c4cb7068769f69e16fcf7a28e6c SHA-1: 43e379b47f1d3b554df2def294a928b5247788a3 SHA-256: c42aa4cf2d931a0844858deeefb8b1ca9408703424676787632dd82667f8f85a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. The document functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly suggests an attempt to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • 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
  • 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://castrolmintabolt.hu/images/upload/file/bamibasupaxifobodo.pdf In PDF document text
    • http://kommunikator.nu/demo/userfiles/file///14908524230.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/pupogevid.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161320623bc6f1---87431544422.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/43318791909.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/111037402292.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/06/varevenuwijisebugafag.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf157bfb59---nodisusaleler.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/kilomibuwo.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/vakilisubakifagiziwik.pdfIn PDF document text
    • http://hongdacable.com/d/files/31738060906.pdfIn PDF document text
    • https://istanajp.com/contents/files/36031560575.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/161301a7d39039---papakurivemes.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1ad2c8981---37399592643.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/vadqnqbhubv6ki15ok555etng4/wugujo.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/21495873706.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/molifazow.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/kiwewulawepugijezamu.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/mivinuwezoxises.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff15a31f80---98254426389.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134c17ccaee4---50385326604.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/kusunomikefobojadarate.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/52521109270.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=hotspot+shield+for+android+free+downloadPDF 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_off0000c928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC928 10672 bytes
SHA-256: 845ecc692dd2b1ba906cbb7051517c3ef2ab0f9822def2e744439a07b8f0d540
font_01_sfnt_off0000e18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18F 18988 bytes
SHA-256: 2681d58c360b10c1ddbb79cc8fea96dec6d7a2386e0c845f4b25fd27937df6b4
font_02_sfnt_off00011275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11275 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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