Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d7a20a11256f716…

MALICIOUS

PDF

82.0 KB Created: 2021-09-01 03:24:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 67f304195bd80464fb861f8072c364ff SHA-1: ac0f7657d1c11ab62d30431613acdabd037c4e7f SHA-256: 5d7a20a11256f716b11d975aaf59d203ff5b497bdd98bb2595bdab128f389910
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites and disposable domains. The ML classifier strongly indicates maliciousness, and the structure suggests a link farm designed to direct users to potentially harmful content. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://synerhu.ru/uplcv?utm_term=oh+sometimes+i+get+a+feeling PDF link annotation
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c45739c99---fugexewibepari.pdfIn PDF document text
    • http://abpaluso.com/upload/file/15993135360.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/562e75a0c1fb1b5e99b8bf3fbcad671f/reduw.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16092635e52e7c---78325519183.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/3735924575.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/sifutalugalajarixo.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/2979424957.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/sugepuxizelafixazaxinusiw.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/kilinomopevedikoli.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/63900446099.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/ad42c798bd61a026a4ac12712d591e63/paseg.pdfIn PDF document text
    • http://qhs1978.com/clients/d/dd/dd8db5a278a7ad55a2ada34b8e38ebcc/File/nutewubixizavedagerox.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878331803b7---vatasu.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/getimez.pdfIn PDF document text
    • http://daiquangsico.com/img_duhoc/files/66852152020.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/7fc06a5dfb6ad63ef239b80f4e286eac/99497813641.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/53b0odtqhdtp5majld5ep8cfqi/vajitegozokusawodo.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/genune.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607635d20ccc3---godudilopikuluje.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/59969201896.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/517aea407d1cf0c7bc3f9513dbc6d562/teruvarimagudejafogaxevo.pdfIn PDF document text
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/94506244778.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1da50b916---8754988193.pdfIn PDF document text
    • 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_off0000d887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD887 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF099 19152 bytes
SHA-256: 060710c8c58bd75b28d849eccae0ceefeb4c8bcf2b1ba24375222a72ddac972c
font_02_sfnt_off00012240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12240 10584 bytes
SHA-256: 8f249795abbea3e0896b5e258bea2aff42869e6c07b0bf2de96edc6c07fe904a