Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e5401848c8c95a3…

MALICIOUS

PDF

73.9 KB Created: 2021-09-02 01:17:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2e85983c9ee9e36d8940fde860160e75 SHA-1: e96d11d036f45977cff2085e6c307fd00345826e SHA-256: 3e5401848c8c95a32037c812d8e78cab93d469975a44925a8dbe44f0181e611b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while some are marked benign, are part of a larger pattern of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ahdongjiu.com/upload_fck/file/2021-5-13/20210513213412912085.pdf In PDF document text
    • https://asiajitutop.com/contents//files/68550201326.pdfIn PDF document text
    • http://hopkins1983.com/clients/861771/File/sagujosugikabololomo.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/84711279158.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/85694697855.pdfIn PDF document text
    • http://bptramptour.pl/files/file/berobuwolujatuguzaxejije.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/rmmbgc96vjhct10udrdsu4jclv/liwimuziledoxunelo.pdfIn PDF document text
    • http://lex.tj/img/file/53712450811.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/4081478524.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/b4b44696c24cc4568cb8551fc07f9968/kexikadulijufikuwalid.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961c0350e98---sumukokawisuvaveta.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/of9mrrbaepiqjr4vnrjneh2mh7/tefelefetasadekofulupu.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/ziradow.pdfIn PDF document text
    • http://memphiscentral1969.com/clients/865565/File/rapisofopadumazoroxa.pdfIn PDF document text
    • https://imperfettoristorantino.it/file/1491246907.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fb7009a68---93933595910.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/vadexorukavutezadakikis.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/6509543229.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/0995b0790f770676a3a6dc72d8936031/5697648645.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents//files/fujibaza.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/2edacd8bcf551fd5f6aba2f9adfc173c/zuderozuwolonowav.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160b423c0f2ed8---6131267141.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=whatsapp+business+features+pdfPDF 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_off0000bd88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD88 16380 bytes
SHA-256: 919a30e69eeaa665e0098916530b61dc2508dcd0b3e2aa7e8537d2b1d46d3428
font_01_sfnt_off0000e793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE793 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAA 10664 bytes
SHA-256: a42f6a061f1af833944e4a26da9bd01b36df98bf4655b4d9ace363804e8e011f

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