Malicious PDF — malware analysis report

Static analysis result for SHA-256 61efa6bf6f5514d4…

MALICIOUS

PDF

73.2 KB Created: 2021-09-25 10:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 32cecae1bcbbfbb0f909782b51f8c5e3 SHA-1: 03053163476c2785e489f7066f47e0b561e1c421 SHA-256: 61efa6bf6f5514d46ed235eb6e75f637535c5a674a606a8d34aa42c7301f21bf
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. The embedded JavaScript and link farm suggest an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://betonkeritesek.eu/Content/files/93213740133.pdf In PDF document text
    • http://st-johnson.com/Uploadfiles/files/15233115069.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613888802b09b---suxuxumebigisan.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/44815264105.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/tojotepezotulegegivagiguk.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/kukesazokiferif.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/48790772117.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/joguxafu.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/80286684169.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/zujekejipo.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/89280072036.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/86527694396.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/93711337008.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16136d6ad409f6---jugofuzefa.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/26940245350.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/25878952293.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/47544553677.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/1546212166.pdfIn PDF document text
    • https://tiemhoamo.tiemhoahaibara.com/data/dulieu/files/10102115222.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/tugedafak.pdfIn PDF document text
    • http://strandedtattoo.com/file/pezevizim.pdfIn PDF document text
    • http://findusafranchise.com/files/files/zapoxemevolutakugen.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/95376764864.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/4fdf2868d606cfa281805d221552aa74/77718696612.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/22925503401.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=office+android+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_off0000b8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C2 10420 bytes
SHA-256: 254ea77f74904acc59c91dd5e9c9832b2bf43b4255d2301c3524fb3d46d10506
font_02_sfnt_off0000e86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86F 18280 bytes
SHA-256: 7b964ba4757d76f2e9cbf4f17a31488560855b9af86bd2264562e26367f1cae5

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