Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d78ee73f6559ee1…

MALICIOUS

PDF

81.4 KB Created: 2021-09-10 11:06:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 76542d2ae6f3b32b0e6ea4cdd04731e9 SHA-1: 115dd0cb0b9084c6e3ed64d10514ddeaa5be9e55 SHA-256: 7d78ee73f6559ee1a7e6e56025d8a16c1cb3e5f76b8af5cc73a4716e8760defa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the document is part of a link farm, directing users to potentially compromised or malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cattaneoarchitetti.it/userfiles/files/80107550211.pdf In PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/96523125320.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/60471789232.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/genatob.pdfIn PDF document text
    • http://birdwatching.sk/media/file/12870542403.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/tigudifabikibo.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/2ddc84fc23ff4b7f1cddffb598584760/mulizovezul.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/14825855480.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/57360429113.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/kewedanomuse.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/worigerobide.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136895adde7e---fivob.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/jegorijizegekesukefelube.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/bufarexofukefelurigula.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/99310598537.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/guzazuxukodatateji.pdfIn PDF document text
    • http://headrepublic.pl/images/files/rapekafuzejejotaraxeba.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/mubugowapatije.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/gunijukenerasevaji.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/3746627688.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/15701360133.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/39499651498.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/53454876895.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/56f9jdeg5d72mvf25r4f0ralf4/61947228598.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=notification+history+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_off0000d648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD648 10584 bytes
SHA-256: 7fdcaddbfef6efe551d7bdc2a98b08e191fd0d873ff40344721d8982f2038c1a
font_01_sfnt_off0000ee6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6E 18776 bytes
SHA-256: b25e1ba7bd4a23c0b33f8d4e788858d1caf1366aca256dd0eda1a57f7c5c3e78
font_02_sfnt_off0001200b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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