Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fc5217e8fda27e3…

MALICIOUS

PDF

71.7 KB Created: 2021-09-11 13:15:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fca8cbbf99618b212b70e8e46fdd8523 SHA-1: 7e464fec90aa4019fe9a65c6d85ccad87b74f647 SHA-256: 2fc5217e8fda27e3dd4179f20cea90b02c2c410851eccbdb5c4246c8f2e5c684
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://swhos.com/upload/files/purudimimabenag.pdf In PDF document text
    • http://ranjitabiswas.com/userfiles/files/90380298747.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109051856529739.pdfIn PDF document text
    • http://haki.vn/uploads/files/6745755797.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/55865876735.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/78u33t6cgunfnmi8u0v0gha446/25631588417.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b961a46e26---56307021187.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/vewopabejiduzopibon.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/rasetuse.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/34171086664.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/gidonitagamepisivu.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/69898017521.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/65758059806.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c26afe42bb---rafirapadizugo.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/66409724724.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/60191577740.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/dopezi.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/578279393.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/pezulavenutaxoligajenirun.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/budimo.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/85238695955.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c398b3448b---49394189823.pdfIn PDF document text
    • http://villaroyalenews.com/userimages/34332661177.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/37730385419.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16134fececa044---30773306414.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/2d72debdc56d4188ed8e1ad99d098970/47123749351.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=landau+quantum+electrodynamics+pdfPDF 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_off0000b80b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB80B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD022 11100 bytes
SHA-256: be31d34ab137a00f2b64cf52fdf94214fc2e0fa7256b6405c2de75829aa3047e
font_02_sfnt_off0000e9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BB 15396 bytes
SHA-256: e3ea9a85fe042a091becad18f23573e86bebf7305c16f970ebcabe30396c2c92

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