Malicious PDF — malware analysis report

Static analysis result for SHA-256 5690fbd7b41758dd…

MALICIOUS

PDF

96.4 KB Created: 2021-09-10 21:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d8687fb5760c90ef77fc66e06d68ace9 SHA-1: 56eb9bcfe1cc81583a7c5eed91856d0a87e65d6f SHA-256: 5690fbd7b41758dd68fcc96ddd17062c5de96cca2463e2e3590153b6af9146f1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier strongly indicates maliciousness, and the heuristic firings suggest the document functions as a link farm. No scripts were extracted, but the primary attack pattern involves redirecting users to potentially malicious external sites.

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 http://onlinendttraining.net/files/34112080137.pdf
    • http://hzqljsj.com/images/upload/File/magixinariwujadixotabo.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b629291cf6---tazolixitefi.pdf
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/99147118722.pdf
    • http://bagiez.com/userfiles/file/81605829786.pdf
    • https://momentous-inst.com/uploads/image/files/82382463482.pdf
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/13023028413.pdf
    • http://mamnonkitty.com/webroot/img/posts/files/rizulezagejetejoxevitu.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/c9409dcec756fdc016a1839e830c7ed6/nuwunozunudirixokifet.pdf
    • http://smm-mm.com/uploads/news_file/jijesivuribedadopusuxove.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613100ae7ab3e---28042698188.pdf
    • http://kammed.com/userfiles/file/jagujowofawuveg.pdf
    • http://escritacontabilidade.net/fotos/news/file/65373453978.pdf
    • https://shopexpert.com/app/webroot/files/userfiles/files/xefisejew.pdf
    • https://vidaleve.ind.br/ckfinder/userfiles/files/80180423864.pdf
    • http://saraya-shop.ru/upload/files/66477871395.pdf
    • http://360global.ca/userfiles/file/98283859048.pdf
    • http://wixoon.hu/upload/file/3338076372.pdf
    • http://85560891.com/upfolder/e/files/20210908202853.pdf
    • http://fandimnarodaku.cz/upload/file/karalibunebotaraw.pdf
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/guwawipokibi.pdf
    • http://casavacanzesanvito.eu/userfiles/files/22194394435.pdf
    • https://yourdentist.ro/app/webroot/files/userfiles/files/bapinolerelitujimo.pdf
    • https://cursosadistanciayonline.com/medios/files/roverokejimeg.pdf
    • http://nmways.com/uploads/fckupload/file/43014155369.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=tamilrockers+movie+collection
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001168b.bin
90b420d3cfc2513591889d52ee1c643e711beb273da3ed2fd223b411a5f7bc1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1168B 10512 bytes
font_01_sfnt_off00012e7b.bin
baf521e1f5ce77bf30c75f2a2832e91b77b1f8d2de6a2f69d4707499ed05b87c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7B 17572 bytes
font_02_sfnt_off00015ba4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15BA4 16792 bytes

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