Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b80ede640b28f24…

MALICIOUS

PDF

96.3 KB Created: 2021-09-04 08:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f1b1d42cd9f828ba4810e73448fa0ffc SHA-1: ce8176ebe6cbce49e98f43f62532347f62480041 SHA-256: 7b80ede640b28f2485a624257c5639ecf83dd02a2727be0708b20ad04c63bfd5
96 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external URIs suggests an attempt to direct the user to potentially harmful content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://oniceh.ru/uplcv?utm_term=responsabilidad+penal+de+las+personas+juridicas+pdf PDF link annotation
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2e97d389b8---lofigozinabatugiwusob.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/85625868240.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202108182336315129.pdfIn PDF document text
    • http://zubrcup.by/files/files/buwiwedomiwiruvob.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/0d40054f4dfc052ef1926c7ad7858700/42801548491.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/36405021408.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161040fa96a086---gamexalafoxivukajukol.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/27750547015.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/9f8a688daad795929eb287614c87d135/lolenewelo.pdfIn PDF document text
    • https://pindimana.in/uploads/file/81915435458.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086b1ecb7610---75302056414.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/81267985813.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/woguvigivifuwezitagasofa.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/figoseretexosi.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/22703461962.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/qsu0oukd59rt7cvrncqvkejdk4/goxopojewuxedu.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/81620439255.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f4d5619e3ae---pilefufesimesex.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/f392c4385db450c9d017912345949203/91101451021.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/73442312136.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/51674427758.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d7d8b39857---94130796432.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/3fb7c18378fb8a3a1a8b08fa2657ddfe/bukiwax.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021051706243573499.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e1d61949a9---kojewafifuborimu.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_off00010b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1B 10932 bytes
SHA-256: 5789c1ba9356ae4d7ad25064a98dfc2fdbfb62402e43429a13ce66dc51c059e4
font_01_sfnt_off00012445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12445 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C57 21384 bytes
SHA-256: ea94694774a6fdf736832102ce034c02c77bdf05e203213a83e0e06e9c35f309