Malicious PDF — malware analysis report

Static analysis result for SHA-256 70d8d2771e564d4c…

MALICIOUS

PDF

82.4 KB Created: 2021-09-06 17:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e50f5d79f29525019159359d1833aef4 SHA-1: f98e29a5d2e07f9d8d82b298e202f7bc651e891a SHA-256: 70d8d2771e564d4cb9ece0269ff6618194c8f300be50174809e8a9bb8bcf3907
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The heuristics indicate the PDF is part of a link farm hosted on compromised WordPress sites, suggesting an attempt to obscure the true malicious destination. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://abril.pe/wp-content/plugins/super-forms/uploads/php/files/s8d4k6ecgtaacheovehfer3psd/wurisur.pdf In PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/9ab57e87d32ec5455d1bcde3339486ff/duvakatolul.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/52564250698.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/49030667363.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/vajawepenewogirudalukib.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/46269365056.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791af004352---80704624906.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4c5fa8b6e6---pojexigipude.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/8766855956.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/cf0350b18bbe8c6ed6b06af0ccd3a6aa/waganunomipad.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/91328815491.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/98552293129.pdfIn PDF document text
    • https://frontlinetherapist.com/wp-content/plugins/super-forms/uploads/php/files/53dbd177cfaf3a5558534759a16ae59b/xixar.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/25777177803.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/6e8b74f7786c54584eb0e1376acaf685/4356623341.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/donabumikepeposibovazi.pdfIn PDF document text
    • http://simpelms.nl/userfiles//files/49033619363.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608985d2d6a30---87115863142.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766d214ba93---51766422807.pdfIn PDF document text
    • https://qnzar.com/files/junizesedazotipapubid.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a26b30c35a5---pelit.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/15896487552.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/dasoxedesalejajejabupuwi.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612cd08edd678---40521297720.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/fc8edb10be0ade65fc31e448ca8c4546/disumozenidudadizu.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/fudesoset.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=jazz+chords+pdf+guitarPDF 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_off0000de5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5D 10768 bytes
SHA-256: 4957d810c8c50ce86fcb92ccdf57007ad160e6fb5466a5875782eb09d38aa4e9
font_01_sfnt_off0000f725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF725 17404 bytes
SHA-256: 0c5d89a25d750a97f7fa61c087d8bd6cee99854042a27fa575539d9912a25a5e
font_02_sfnt_off00012435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12435 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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