Malicious PDF — malware analysis report

Static analysis result for SHA-256 669873b64378e3a8…

MALICIOUS

PDF

76.0 KB Created: 2021-09-08 14:37:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6451fb917215dd5d76c04794e08d8667 SHA-1: 21fa01e4a7814c83462d6f98f682a6218236e2d5 SHA-256: 669873b64378e3a87d18e74a07f8a85925345dda48187fa16fdfee1b44642a3f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress sites, indicating an attempt to lure users to malicious content. ClamAV detection and ML classification further support its malicious nature. The embedded JavaScript likely facilitates the redirection or execution of further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/992ae7816879b116ce4ce1b87c40d170/80252424428.pdf In PDF document text
    • http://geosond.pl/userfiles/file/jalajijojojopulunaselu.pdfIn PDF document text
    • https://performanshost.com/calisma2/files/uploads/89917544438.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/16361312952.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/m2ucdp3refv3fcl9ljqf8ftm6n/69786588517.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134648ac22d2---71846524207.pdfIn PDF document text
    • http://domario.ru/userfiles/file/22882813456.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/87910142962.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/foriwotifaxozujexafuvanod.pdfIn PDF document text
    • http://p-jtech.com/userData/board/file/morevojobefobulawidu.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/pobezu.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/92259710238.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/23077193937.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/vojabasafimilifir.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/e8a1f2591091c9a1733c9cacf7e42e33/bodexiwi.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/22082516469.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/83472758951.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/gisoj.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/43593436955.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/davogaxofekeneju.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/legidoraxokinuv.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/49139743067.pdfIn PDF document text
    • https://33mobility.net/uploads/files/43110108636.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/83688015768.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/70255761143.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=anglomaniacy+numbers+worksheetsPDF 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_off0000c4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DF 11188 bytes
SHA-256: a68a823446922f3d8cb96a36f8893ba7f7d98eb2074b725c7801e15371c4538d
font_01_sfnt_off0000defd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70F 16900 bytes
SHA-256: 924023bed7f4cca1daf46c081aaddb1939fded4919723f1d3d093683ffa95767