Malicious PDF — malware analysis report

Static analysis result for SHA-256 577600690278f85b…

MALICIOUS

PDF

91.4 KB Created: 2021-09-06 01:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: be956878db8a3a31196dfbd7e01119e7 SHA-1: 86e61e7b0376cdd34462040db6a505965bbf062e SHA-256: 577600690278f85b3a4c1daec4d6c7834d6fe306eec2475c3e7590428d337dba
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised or disposable domains, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly indicated maliciousness, and the presence of multiple external URIs and link farm heuristics supports this. No scripts were extracted, limiting the ability to determine a specific payload delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://cructi.ru/uplcv?utm_term=porcelain+laminate+veneers+pdf PDF link annotation
    • https://papersacksfactory.ae/images/bulk_images/files/wivuziranusexar.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcfb77e980---8449230863.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/54194452925.pdfIn PDF document text
    • http://usagimatur.com/files/others/73553718184.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/73952257186.pdfIn PDF document text
    • http://dentali.cz/files/files/vanefukelozoxapojazo.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/8e967c88e10b8407ebe6b55e8a356b09/11659692288.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b93bbb1a0---56080897592.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/ae2sov7baun078c9k4vbp5bodo/82043876756.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072bb22e920e---balamotevogikixegelopuxi.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/3f152cd3062d6dc588c67b00c81a5540/94345125121.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/51611868979.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/63968404949.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2d5c0f754---9667387779.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/4735fbf90063f215e762d8b3d98c40fd/18883281236.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/md2nuq8v997b3co761lt3bj10h/rivawudamaguxalezitenuno.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/29956244405.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b21dbded6d4---79286683128.pdfIn PDF document text
    • https://clove7.com/userfiles/file/49355806548.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/labobefu.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/75100190153.pdfIn PDF document text
    • http://nktrading.qa/file/files/34013889731.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/3sihoju61m9deuhd5uvni8e9te/kumifa.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b97c71a8e2e---sipovekokixada.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_off0000fdbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D5 10848 bytes
SHA-256: 2695aa9e5e1f057858ddb7240c98aebdbd061af79494b90eb9bdc1eb9ee4c699
font_02_sfnt_off00012edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EDD 18776 bytes
SHA-256: 5ec599aefe0dfdbbbd55d014b81ca01cff8958cf23670da2268b36403a8e1864

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