Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe1864c00c748cbd…

MALICIOUS

PDF

81.1 KB Created: 2021-09-08 23:13:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ff4c77436397c55b1ca70dcae3bca1c1 SHA-1: 954211f543a4f0eb8819e24af1ad2c5c367cea85 SHA-256: fe1864c00c748cbd60fb48c7c288d3ea579e68ad877c096b360ce5cd9140a75d
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is a link farm on disposable hosting, suggesting a tactic to redirect users to potentially malicious sites. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.psoealora.es/ckfinder/userfiles/files/soniwaniko.pdf In PDF document text
    • http://ip-malkov.ru/uploads/files/nanoxeros.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/ninutozisil.pdfIn PDF document text
    • http://i-tos.com/userData/board/file/3430502017.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/aa36a53517ec8cbe1d6e51ffa0101d22/23875894807.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/66669934197.pdfIn PDF document text
    • http://hidropro.hu/upload/fevimewa.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/bilop.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/55747876195.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/61146532744.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/98261399212.pdfIn PDF document text
    • http://ibsdhc.hpds.work/ecdemo/web/js/ckfinder/files/files/7108247511.pdfIn PDF document text
    • http://airmon.hu/images/files/pejodi.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/bejusimafowuworuwolopet.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/20634381517.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/4310794511.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/31735083729.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/23001765395.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/jujuzoxekaveg.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/15720331033.pdfIn PDF document text
    • http://ipai-bg.eu/img/file/nofewitanewid.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613032ebe7b9c---kilakubabibalumo.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/wutefobilegogoxolonunokil.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135965ce98c5---mixawugomukupati.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=phone+services+apkPDF 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_off0000d88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88F 17816 bytes
SHA-256: a6117f433c465548a5208aa816927cf42c93c9fbb9a7bb97771bed990c2d6d49
font_01_sfnt_off00010731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10731 10484 bytes
SHA-256: c6f488c2d8cb71c2ff268838a23f2855645a38352dac1c689ca9f24c00c8873e
font_02_sfnt_off00011eff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1