Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c572b5ab4b527d8…

MALICIOUS

PDF

87.9 KB Created: 2021-07-02 18:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b8b308a53e8d505a6bbab9cede3953a4 SHA-1: bdf2ee5f347165c7d8ed10121011fafe3f5a6fcf SHA-256: 2c572b5ab4b527d85cc6a437649e81eb0dcbdb74cbba8389d7f7e9acb114657e
96 Risk Score

Malware Insights

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

The PDF contains a significant number of links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed for SEO manipulation or to host malicious content. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, and the document body was unreadable, so the primary threat is the network of URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://forter.vn/hinhanh/file/lowawipipasutug.pdf In PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721e499a36e---fexuxonerevinuxusa.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160889534ae0da---latirasopigisuliwateg.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/guwebupesetuxege.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/19908156a371aaef46bcea2180df4eab/36833859513.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/gejamedemogumutat.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/89469123108.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2d9431a54---vajerutefapunifobeturu.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/65823673580.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/27ab6ac26c795edb1648cd918a17c0e8/44984941588.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608eaab8c0d53---wofexubobidunizezon.pdfIn PDF document text
    • http://anjilh.com/uploadfile/file///2021043023035036.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cd4f2ba1d---rigolomenavul.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/71771941269.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/967856790.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/kosikarazefaje.pdfIn PDF document text
    • http://mousike.it/img_ins/files/61594004181.pdfIn PDF document text
    • http://krikrik.ru/uploads/ckfinder/files/27546877702.pdfIn PDF document text
    • http://poiskvod.ru/images/file/bawewadurawaku.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/81786095560.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1bfa4d8b934747afbca4779a5ca8ca43/gonokesazulofego.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9344edd398---50949950251.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=difference+between+rom+and+ram+in+phonesPDF 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_off0000f2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B0 17620 bytes
SHA-256: 7f1e6deeede31bf48dc7cbcdfaf7f66c2e627806929fc6f3fc97c510c8938ed4
font_01_sfnt_off00012103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12103 11064 bytes
SHA-256: 285d403799534dfd2651487340a54be9fcee8d17b0ee17f70bfc719d59f13115
font_02_sfnt_off00013a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1