Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5c4ca617b3cb78a…

MALICIOUS

PDF

87.5 KB Created: 2021-09-22 13:12:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 101b1dcf545f9454d9b3263adf565eb2 SHA-1: 7fa8082414f00523a6033be777cc7ef208543436 SHA-256: e5c4ca617b3cb78a63cc47257480ddacc11ccb087472279da9fced27224832e4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded JavaScript, while not fully analyzed, is a common vector for further exploitation in PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://triatlonshop.cz/userfiles/file/kovodel.pdf In PDF document text
    • https://art4you.sk/editor_uploads/system/files/8220221163.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/41135436253.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/39996107612.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/nuluwuwabolekifeb.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/joboxabap.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/bizerofexaxaj.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/tatovogimexebunamupo.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/wamiwufajukisoxatemavajib.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/81120522197.pdfIn PDF document text
    • http://weldingplaza.com/files/file/34442938595.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161361122dedb1---vozanoraribadugigibupunek.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/zofixadegipanewipomezeti.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/wenisaxudiguzul.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16143447dc2407---monedusopoxozoguxulojori.pdfIn PDF document text
    • https://nhatthiengroup.com/files/uploaded/files/wirudegagivagalo.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/jikafaturamojosonudokigo.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/roxemeboxutilonedemerugu.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/89a33c2998687b7dfdcfa95fda0b004b/rufuwapav.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/jopolonusili.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/15035162571.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/kotevekar.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/pajejofafofesaju.pdfIn PDF document text
    • http://suurelepa.ee/data/file/16689097665.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=android+get+list+of+installed+appsPDF 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_off0000f310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF310 10656 bytes
SHA-256: c634fd7a6b274fccd474f8549f0d34afaf58142d5aaa469e2d9059bd7615ffd6
font_01_sfnt_off00010b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12376 17436 bytes
SHA-256: 877fc5a353d7579d7ae9f8db9e39faf9ab722b827eb62223c53ec008b2630a07

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