Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cf3dd5e2dd0630c…

MALICIOUS

PDF

86.0 KB Created: 2021-07-10 00:21:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fa56881b7376e4892582618b1cbf76c2 SHA-1: b9ca1628b57150f2825a3daa4b6795d2c9e4974f SHA-256: 8cf3dd5e2dd0630c36617678128ccd326f401309691581c082462b11dc08ece9
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This pattern suggests a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16091891a95cd4---jewogisalotozixiguvifunus.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/9c156ae33d5b442979ed9b51fcc0ecee/fuwejedakajenuzev.pdf
    • http://learningkey.org/userfiles/86701136751.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/slrj4andbck42f4i6rg4o6io3l/40805727725.pdf
    • http://kimhoatra.vn/upload/fckimagesfile/77199431299.pdf
    • https://bancodevida.com/bancodevida/admin/images/image/file/10022295745.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/rt5rhbtvfg084q0j9p99sanar4/vabevupiwotasifikisek.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16075dc4fcf1cf---bukulup.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944c9c4c371---87537545561.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1e66ddb8a---kuviwi.pdf
    • http://rajskiewakacje.pl/userfiles/file/miwesoparulon.pdf
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16207789908987.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/6hogkjunieo5206699bjipor20/pobigububavok.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089a07922da0---nibonulajidofozobafimokux.pdf
    • http://apsencollege.org/test/fckeditor/file/wokodugarikilafitu.pdf
    • http://bobmeetin.com/media/galleries/files/lapalekelitijudofukiferu.pdf
    • http://robbes.nl/media/files/71589081956.pdf
    • http://buildinggodskingdom.com/webcms/file/wovate.pdf
    • http://noahjohnsonsark.com/clients/e/ef/ef24418f2336b9480f3353ee42fa3f58/File/kujadotelezetefi.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076066a5c0d8---dofiraz.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607615974d4a8---jenopo.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fd85baf1f---jawebojovabitoxitas.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607374896cffe---bivaripamusexezu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=3+ingredient+mac+and+cheese
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edb9.bin
7c1aa6d1f929bdc747507b595c50d596a3066e60d9d902440cca44b373f02623
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB9 17176 bytes
font_01_sfnt_off00011a9e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9E 16792 bytes
font_02_sfnt_off000132b5.bin
735ab2ceda161fc039b4532f3b94301c12ac100893f8e84b22511579fcfbc696
pdf-font-stream PDF embedded font (sfnt) at offset 0x132B5 10724 bytes