Malicious PDF — malware analysis report

Static analysis result for SHA-256 88994a8058ad46dd…

MALICIOUS

PDF

84.7 KB Created: 2021-09-08 00:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 35f21cd8734704ff0fb58e9a64178a40 SHA-1: d9c4d945184ffe4d04513b03e938941af00df5f3 SHA-256: 88994a8058ad46dde3c716b5b7134e9e72d1f79fce7bf06ae453c15d59bf2852
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/ffbe3c611ce144ad8873a4d747ba8de1/mutonedaxagutukek.pdf In PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/jo749973ed9ohdrucdjt7b8np6/15476829475.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/568199e181643b11f077513c34a93a56/xuferomemafu.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/57113535870.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/rinalojodakigibitezedumin.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/20391803796.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/67802151451.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/15978728397.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/wewija.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/57757809757.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/6048074303.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/2d2losf4g28rd6pt055er01gc4/vojekopikivitaduko.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/lijegex.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9bfd8373d---towutuvirazoti.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/puvowet.pdfIn PDF document text
    • http://hanbangrd.com/userfiles/file/20210727154731_574691249.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/0e87gm9nrig2orqvubkt7mn4tn/vawarakitozasefelivisusum.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0038dae097---1684209902.pdfIn PDF document text
    • https://mollis.rs//files/73344131323.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/5317934345.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/12171298797.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/numixafiriretuvevipipoz.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/161292e72d2cf2---48914694786.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/sivanenogara.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/73247482153.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/lowafepesexegasepenu.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/578ddc6728eb311d38a1e75a9ba29a8e/nulafimozupe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=yoga+sutras+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_off0000e650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE650 10516 bytes
SHA-256: 5cf75dfa6944c7222dcc7a391020336a0aee2f9d67ac17711b68e788c103ebfa
font_01_sfnt_off0000fe38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE38 18136 bytes
SHA-256: 37dcd9c23761dbc07bfb33a851c77674414dd2fc4e901c71c1e2d621d6141ea9
font_02_sfnt_off00012d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1