Malicious PDF — malware analysis report

Static analysis result for SHA-256 35c640d34ce057a3…

MALICIOUS

PDF

88.5 KB Created: 2021-07-05 06:29:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: dd368d6bff347314dd9a43745f2071ac SHA-1: 3a6f2e83d0ab1d8cbd3525537c72594867dd8caa SHA-256: 35c640d34ce057a3d01eeb31ec42945ed6a53a63d7d0c947de1c7e905070674a
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute further malware or conduct phishing. The ML classifier strongly indicated maliciousness, supporting the assessment of a phishing or malware delivery attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c392144d98---37805922298.pdf In PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072eb7bd7220---dotiwefonewurot.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/vezadokerafiwumefug.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/gigeguwufujexoxuw.pdfIn PDF document text
    • http://kadernictvo-svetlana.sk/editor_uploads/system/files/tinufosugixexu.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d88ee8b5372---redeko.pdfIn PDF document text
    • http://maduraigarlandshop.com/userfiles/file/56834076786.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/subanoxagawuko.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ce1de115b---3740616119.pdfIn PDF document text
    • http://sweden2020reunion.com/clients/e/e2/e2375cbe45a1e08e95d3a39ca41e84e3/File/raninuxis.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/c47ep7qlm8r146curuu0ssbo4h/65184748716.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160973a8e26916---88733651153.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/jusegatikijo.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6e027ff44---ragibarazakaguret.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16253990441284446747.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/wefaka.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16086e4518aabf---44146859463.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700e57d53c1---bataxewomunavulizur.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/78721134265.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/vm4drvsc2rg2sipvmpmhia1st5/betexarepepawefodi.pdfIn PDF document text
    • http://aurora-c.jp/files/files/novirele.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb9f51c9e4---64730958494.pdfIn PDF document text
    • http://m2mus.pro/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/29838877514.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/73035789044.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/e9a87grerlpoos7ijp8m28se67/41931125742.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077a1624652b---logumo.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/42501899830.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607384ae8e165---lexiloxewibiditapalume.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=what+to+plant+with+cornPDF 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_off0000f972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF972 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11189 10252 bytes
SHA-256: f72b06c43f13ad4ce3944dce0e879db094b232f5fa1aed341db5fc5d954cf521
font_02_sfnt_off0001288c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1288C 16904 bytes
SHA-256: 4394fbca6353051fd0a6b3b2b9b1d51ecb85522d77796bb42de3faa8bf79af82

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