Malicious PDF — malware analysis report

Static analysis result for SHA-256 d679552b99a534c7…

MALICIOUS

PDF

72.1 KB Created: 2021-09-11 08:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ddef98a111ad70cde57286acaac31721 SHA-1: 80165dbf91db037f2ceba68f65b39f53890c74ac SHA-256: d679552b99a534c79b4908311a69a9c469a52ce26efd494bc8d2bf21358326c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to other PDF files hosted on various domains, many of which appear to be compromised or disposable. This structure strongly suggests a link farm designed to distribute malicious content or facilitate phishing attacks. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=app+cloner+old+version+apk+download PDF link annotation
    • http://ukonlinedirect.com/userfiles/files/xapaxatujinagabokijadupe.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/68lhtfkr3hg3i0e74dhrs80qv6/24380920773.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/9677308557.pdfIn PDF document text
    • http://getem.eu/files/file/vuweko.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109070322037156.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/wuvaxagefifupizifiba.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/01hi9i36rm5p5s7g095oqfbkfv/85966262536.pdfIn PDF document text
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/69980441220.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/sozumotutowur.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/faxemisojesakotan.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/solagabuno.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/30396457492.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/28260056299.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bee8420bb5---64485527249.pdfIn PDF document text
    • https://pr-dienst.ch/file/26912185776.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed68b717b9---71390094060.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/36087132557.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/98e5aa8bc487843bbdb0bb5a8087a66c/90657129414.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/e31ae30389f8cb054280c068641b2d24/98164623273.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/gazezuvudubowubupusos.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/givew.pdfIn PDF document text
    • https://anaksemut.com/contents/files/welowodukuleve.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135a604241d4---kerivanon.pdfIn PDF document text
    • http://yibetter.com/data/files/zitivap.pdfIn PDF document text
    • 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_off0000b7b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC9 10632 bytes
SHA-256: 49cdbebe28fc6871872222fd34872ad5910b71bcf7d3d1d66f6a008bdb7971e2
font_02_sfnt_off0000e849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE849 16732 bytes
SHA-256: e8d27c4db490b657a23e651306c56c1f8d79881f23aa527f5fcdc5f7026443a6

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