Malicious PDF — malware analysis report

Static analysis result for SHA-256 29903e3a29c6d4bb…

MALICIOUS

PDF

81.2 KB Created: 2021-09-06 04:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: efbe0358c29c632c0b3f1128f6d8e457 SHA-1: e34e2f680c09b45aaa22b3a9d7fd6279714ff739 SHA-256: 29903e3a29c6d4bb34c2a4a86cc6b362b43deb7a3c0255e9fa2003ed4aa2aba3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm, as indicated by multiple heuristics including 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The embedded URLs point to various domains, many of which appear to be compromised or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://aviatroglo.fr/IMG/file/febumulumin.pdf In PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/84ca1729dedf0f69b5bd69fb05086e33/vinakafegonuras.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/vuzive.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16082610ab71a3---jubudajasusobe.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc386ea084---13119496536.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/bemusagoguwawulowejukexo.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/32872385934.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160f9d354c4410---27639403312.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160b97fa7985d5---55106192269.pdfIn PDF document text
    • https://churchofgodinjamaica.org/app/webroot/files/wiwafixategimipatipaz.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia//files/zitudot.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/melugoxinunebelilof.pdfIn PDF document text
    • https://tigaintan.com/contents//files/47099331765.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/711f7e2a082add27aef574fdd4cb1fbc/81317851609.pdfIn PDF document text
    • http://miltonhigh65.com/clients/874455/File/walarasu.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083700b315da---3904138700.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/o3g1fat1447enl6mm8h5pjkscr/jituxexo.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/42202199707.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/bapetewopetakarad.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/ee8e478976bf208c741ff852196d9ea8/24746384781.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/39493176269.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16118fbae97ed6---sorenotapuwebepatakozav.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/o1pvjlm3pcbd37mukmisjs2cb3/92964804012.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/lawige.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=adobe+acrobat+pro+join+pdfPDF 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_off0000d863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD863 18068 bytes
SHA-256: e767753716062cf4215d4b934397bc8ff3280797db51dcadc8a0bc9ed0b964d2
font_01_sfnt_off000106ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AE 10652 bytes
SHA-256: 09048e30d2490e8ce9c160f7c3ccecc333f0b4dcc6433d3d4e74914d2f6bab7f
font_02_sfnt_off00011eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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