Malicious PDF — malware analysis report

Static analysis result for SHA-256 626696ce60566fb8…

MALICIOUS

PDF

80.9 KB Created: 2021-08-09 13:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d52ad5c48dc28f2d4f9a2404398b84dd SHA-1: ccb735c65c93ba5604313426181385c1e09f2664 SHA-256: 626696ce60566fb81268d87df04bc2f0d6e9e5b11a2a5898fe7938144f2adb88
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous external URLs, many pointing to compromised WordPress upload directories. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to lure users to potentially malicious sites. No scripts were extracted, limiting the ability to determine specific execution methods beyond the initial document access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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 http://www.advokat.com/app/webroot/img/fck/file/webulowazipurogisepapum.pdf In PDF document text
    • http://rahway1968.com/clients/5/53/53e48f2724afc57738bbbcfbfdbdad27/File/zipojivugesogawoxudi.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/zogumiwuxelapola.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160789b7281be4---wopezuxosuwireba.pdfIn PDF document text
    • https://ijpdua.com/contents//files/21994337751.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758885a4c1d---72262075019.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16085170acb059---vepesijefa.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/56862728246.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8e6831e7a---fifegejat.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b548b08858f---67635505454.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/12268026831.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/191968f7052c3f67925adbadc995c75a/65692915378.pdfIn PDF document text
    • http://airsoft1.ro/files/file/jefanokikovovaselabameb.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/gufis.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/7205734650.pdfIn PDF document text
    • http://hi-techfiber.com/userfiles/file/tomogudorejusafikulikeli.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/61077129273.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea6a87c3d0---jotofitetuzateroxod.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/l8v46fe3scp4dlkuk8ok4f8pj2/29341818630.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/kotamigokelitixet.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/kefobisoj.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/22014536082.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c49ac6603---58188548362.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/figunikew.pdfIn PDF document text
    • http://www.heksan.com.pl/file/53494012187.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=can+i+make+lined+paper+in+wordPDF 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_off0000d9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EA 10496 bytes
SHA-256: 601cad29c6cee7fc1a6133548b418662b3b3f021ee286625683f4e7f0de9b2b3
font_01_sfnt_off0000f1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C9 16532 bytes
SHA-256: 0c8a1bbc1dc1f0f622f4e1dcde821d378adc22020676351dc50b2f1fbbc844e8

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