Malicious PDF — malware analysis report

Static analysis result for SHA-256 115ef8fd1e945fe4…

MALICIOUS

PDF

80.4 KB Created: 2021-09-03 07:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5da4791a100fccdafe0aa9ea1ad59da9 SHA-1: 243f82f16f5c2ea7d839440ca9b76a4e6f9ab0fc SHA-256: 115ef8fd1e945fe48e0ee5ac4211f149224b07d2b2c758b5528a0d6eaa305b5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The primary purpose appears to be distributing malicious content or facilitating phishing attacks through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://tunhuaduytan.com/upload/userfiles/files/35776709325.pdf In PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/a0eb2136652472273a881d957f58c2b3.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/422c501ff601a0b12bd6e0bbf8e468a4/79809957100.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/15435652783.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/3418acvcs9el6muqsmhaljc66t/poxagokikotagajilig.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c02a6de48aa---sudenurenetob.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/23974446602.pdfIn PDF document text
    • http://ccshecea.org/upload/files/79054762641.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///valosaruxilisofuj.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/55282262169.pdfIn PDF document text
    • https://jcpcdesign.com/upload/ckfinder_temp/files/20210706063510.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecabbc15a85---xokerisuxinafukujixebuxos.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/62236180796.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/5588674161.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/10798529206.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/85670230324.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/6bc33ebf1e9f7f2eb89aca35624ae4ce/ziwibesadinedixasugenexe.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/80118709019.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/0c296301332967763ea11c348f4111d2/zovemuxizuzifivanuze.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/sozevowu.pdfIn PDF document text
    • http://haki.vn/uploads/files/jijetupe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=patterns+of+inheritance+worksheet+answers+key+chapter+9PDF 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_off0000d518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD518 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2A 17488 bytes
SHA-256: fe66a85a7af70a9b82ab0041e9fdca6fd5bfb3d2d128f0c9dfcd0a904668c3b1
font_02_sfnt_off00011a6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6E 10992 bytes
SHA-256: db9477a2cf51558454154dcc62800a93cc230461d6ee1fb63fd1bf8da06b8a9c

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