Malicious PDF — malware analysis report

Static analysis result for SHA-256 242408743d89ae3c…

MALICIOUS

PDF

88.4 KB Created: 2021-08-24 22:34:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6188eea4a66d4e43306094a5fd65f995 SHA-1: 3830d6707a8bd6a156da3286c1926d84518a318b SHA-256: 242408743d89ae3c9aa26d0127ccbd1e8cbb47645c6a97dd296e90fd3c23c6e9
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. Heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm its malicious nature, likely serving as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/b4c4085c0264c0d8e643d897578181a8/deropipanapusone.pdf In PDF document text
    • http://madiagranitosilano.it/userfiles/files/1817274049.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d91348e768e---23843068214.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/jovovukupivuwibarozawew.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16091682b1f3fc---sufuvafulowogiz.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/c64755ed29fa6dde75632fec80acbc2a/37355122024.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0664441001628118612.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a269bef20f5---83009493682.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/14755111559.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/eec5e59ee7f2d36046f7c24be0cd7056/botipapijaxujepaxogodibu.pdfIn PDF document text
    • http://sbairs.com/datas/files/xumaminipe.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/4pb3el0fqeemq92bga8n5n3hbu/dozaxin.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/d3578ea2a660b2808279a346a8735f25/lowofo.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/a475a3b7ed286f44e468162f9340049e/nelonatol.pdfIn PDF document text
    • http://clingac.es/d/files/ramupebowisizirosavi.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/jalediz.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609842503de42---44839494594.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/geragik.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/pqlp0u42qfnf93q7m48qujss1i/wegumelede.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2ec896ed8---rugigoma.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/rkqc3e8nbup2oui27qokak2671/vuvuvadowejikonaju.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/31938588972.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c63d24763e2---72940049449.pdfIn PDF document text
    • http://www.alborada.es/ckfinder/userfiles/files/22058895598.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a705aa688---87098095232.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ab8b7aefd---dalajozosugabelexopuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=list+tables+postgres+command+linePDF link annotation
    • https://www.postgresql.org/docs/current/static/app-psql.htmlIn PDF document text
    • 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_off0000f411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF411 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C23 17900 bytes
SHA-256: 0339653a1b88c4b5007a2ab6142b9a912dbad6a7f98198541a2bae046d61f070
font_02_sfnt_off00013b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B02 10956 bytes
SHA-256: d6d29db9b0ed0ec6c0028969a21449ca77e4b614ef49195436d8faf11f5f5038