Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb12af03d8c4b08…

MALICIOUS

PDF

93.4 KB Created: 2021-09-02 05:54:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 0038d0106b1b266f8ea68291e5ff8a7a SHA-1: 9bfbe0725d477ccee6b72bdeee7bda4597f7bee4 SHA-256: efb12af03d8c4b08bd8e89f9f29e69f2fc7ca8378e4387a0f268c112009d6a7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or serving a secondary payload. No scripts were extracted, but the structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d959905b98f---supupitapub.pdf In PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/93eh481fhgbn74v5cn48lqr6s4/4771882600.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/7bd18ac6f1819436cea6f8a4b890dc33/juzawawag.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/44866564730.pdfIn PDF document text
    • http://sgpeo.pl/users/file/memig.pdfIn PDF document text
    • http://kisito.com/userfiles/file/43067242692.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/pizinu.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/1e2bf2dff8b97ba40a9721ebdda59561/kowudesubogikufujesoko.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/799918775612396ba94363.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210726064335.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8621ef1253---newuluvunibupewixi.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/96741993301.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/junowun.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/nofiv.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/fapavukonogomogesi.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/1ue4add3f29h5fmvjr8cdud5p6/36469263989.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/biterogerilozebub.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610c316f9eede---79094967618.pdfIn PDF document text
    • https://amblamy.ee/upload/file/54490737021.pdfIn PDF document text
    • http://savannahcentury.info/clients/4/44/449a5b3489ef279447e90cf6cdd72f1c/File/5125277577.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/fc6211990e3e93831b5c2d765b9246eb/sububel.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608db77eef7fc---35308152880.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/42001882171.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=the+indiana+torture+slaying+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_off00010490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10490 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA2 18800 bytes
SHA-256: ca10111c2f8956d8f568b18628174f845a9990aee694f19d66671194af08d1e4
font_02_sfnt_off00014def.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DEF 10952 bytes
SHA-256: 9c7b60b5558a57e1e32623b3054cbfab85c54a9906bbc88c4fe40897c655bc18

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