Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd1a4c050fd764d7…

MALICIOUS

PDF

87.7 KB Created: 2021-09-10 11:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 90b790bcaea18e5f818a116fcc2cf2e5 SHA-1: 3d9ce2bc49b08496e99bae8b2b474dba4142bbca SHA-256: dd1a4c050fd764d7f73eb1f433450847412aed503099bc1e9cc31b1e4cfaaff0
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The file's structure and the nature of the URLs strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613957876ef73---lodobofezofovudi.pdf In PDF document text
    • http://sydjpg.com/images/upload/file/20210905_073702_180.pdfIn PDF document text
    • http://uhorder.com/upload/files/detepebadetibiwixelexokis.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/rolupokeramaxifilepapomu.pdfIn PDF document text
    • http://sake-tori.com/images/library/File/42759736825.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/21015587897.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/poporemenalefugaledipipip.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/67584792421.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/93403760449.pdfIn PDF document text
    • http://timebymtm.com/upload/files/dojoligimozanavamu.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133ba34255bc---kixuw.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8796692c8---penim.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613305e168695---luzozaxomora.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-5/20210905110333370729.pdfIn PDF document text
    • http://keramann.ru/uploads/files/nikulag.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/57871208643.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/sorexagakujalarifa.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/sugizexitupobetumiludut.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/xewunipekokisizikonavuj.pdfIn PDF document text
    • http://shopabrang.com/images/files/munafu.pdfIn PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/sevukoviw.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/97664299855.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134915ae0f6b---17214119946.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/64833634944.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=family+resource+management+3rd+edition+pdf+freePDF 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_off0000f17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17E 11324 bytes
SHA-256: 321af437362ff3a459c48a32882c10a3da24e4a354d67d6369958e1a1744ff2c
font_01_sfnt_off00010bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001240a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240A 17336 bytes
SHA-256: f9ba70fee00af31c77451bc8a45f7b2244e4e8775e3fccc10072e25e8f4a6ba3

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