Malicious PDF — malware analysis report

Static analysis result for SHA-256 a374f9fd4b54f630…

MALICIOUS

PDF

79.6 KB Created: 2021-08-27 09:48:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9ef9f9a94f90631695ffcd8f9613c0c1 SHA-1: 07fa6a1432b23f6455fd678edc913d4a8d182fe1 SHA-256: a374f9fd4b54f63058d3e42cd2f4d3119855cb3876479280ebd8915d82d658dd
164 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 WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a12c64bd1e6---93543695097.pdf In PDF document text
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/pelewumamotefut.pdfIn PDF document text
    • https://alutat.com/data/file/fowiserebin.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/b3990f46680c2197b9138c6bc4169bf6/kiwiludopigulivetulusa.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8796df787---44603372456.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/15063068849.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a13554aa327---7111147798.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2f521ded3a---61184310069.pdfIn PDF document text
    • https://slide-bearing.com/d/files/jexaraziromig.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b44565b35c2---wamewikepufaxabejuweje.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/fitonewepa.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/41723107090.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d643577cd3---92339456402.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/bazal.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/lizisutuzamuwalaz.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/4hotb6lqan2mc03rh2ssp5c5dg/45599419962.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/65510064023.pdfIn PDF document text
    • https://esvigo.com/upload/files/roragi.pdfIn PDF document text
    • http://billcolletterealtor.com/clients/e/ef/efe7172bdc9c6addedf700543cb5cb37/File/40358751300.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/bamurevukasuvesuvilos.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021080823441410.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a072799c5f4---binizejuzexaxizej.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/2828120293.pdfIn PDF document text
    • http://riph.pl/userfiles/file/xubikejasokapabisefura.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=functional+analysis+kreyszig+solutionsPDF 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_off0000ced5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EC 10748 bytes
SHA-256: cc3cc90f7b83871ac537700cae3c3c140331a4c958f8d3f297bf10a4874f8a96
font_02_sfnt_off0000ffdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDB 18068 bytes
SHA-256: 66fb782b965a21b537bf5d3b65661ada2caca6ee5a90dc44bffea12d4168abb3

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