Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc67d962c5dfee1a…

MALICIOUS

PDF

96.3 KB Created: 2021-09-13 05:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cf4988152923e33cb469f03b703bd3ad SHA-1: c71d54c61620ac71c23a65154927076fa06e76c7 SHA-256: dc67d962c5dfee1a9b7965309bb2932a120990ed1c19c32e7c92497947b93bca
112 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, many of which point to link farms hosted on potentially compromised or disposable websites. The presence of a visual download button lure further suggests an attempt to trick the user into downloading a malicious payload. The ML classifier strongly indicated maliciousness, and the overall structure points to a downloader or exploit delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.jacenter.org/js/ckfinder/userfiles/files/19713301022.pdf In PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/69844705182.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/reginepewosizadupuwe.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/gexuwofugisumugolabaduno.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131c25c1fa54---42722939295.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d2fcebd15---38026565378.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/54353334332.pdfIn PDF document text
    • http://teifsepahan.com/files/file/82626023289.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16134a7e4f3ce7---parib.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/7767841463.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/78540838193.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109031905552062.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/kajufudagulekonipoj.pdfIn PDF document text
    • https://aurorabersinar2.com/contents/files/75938282439.pdfIn PDF document text
    • http://upakuika.com/img/file/mapisorawedidera.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109121742435044.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/zazovibatimujolufisuwel.pdfIn PDF document text
    • https://halkapsikoloji.net/userfiles/file/18648609088.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/mevibowegu.pdfIn PDF document text
    • https://kaparatt.com/images/File/nujabiderezufekataletiso.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/jojowebimunit.pdfIn PDF document text
    • http://asvpp.fr/pdf/waduvigotef.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-11/20210911225610183107.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/luseluxemaromenufidowatul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=ofilmywap+movie+downloadPDF 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_off00011671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11671 10584 bytes
SHA-256: f0e10f8490b2db617eebf51eecd5b665102dc4797465443649a3a6367cd5d5b5
font_01_sfnt_off00012e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000146a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146A9 17460 bytes
SHA-256: 15f8fdbffe92f9b4735405e1d35412d381617990c0a01a369995c6c1a6787dd4

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