Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d57d2fd4018aea0…

MALICIOUS

PDF

92.8 KB Created: 2021-07-02 09:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6b1a5ad5c2f41d713ef23e5da279bb16 SHA-1: a2a0358a6c338a3b1330d6e9a841bb42888cfe76 SHA-256: 9d57d2fd4018aea0ab538141587c7627f44d7bbcf99e441abe6d9b7726d34b9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as containing a link farm pointing to potentially compromised websites. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing or trojan variant. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a7774c7a200---wevif.pdf In PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/94e9f6cd9e4e630abedc8b7d0c3f1ee7/12258226823.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb5db84895---58348308962.pdfIn PDF document text
    • http://praguetransfer.com/files/file/lulofivibetedininapufet.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ad94d5b79---dupesisad.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/wejukagazewewivositofu.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/j242uicui916tspif534ivqkf0/98496927783.pdfIn PDF document text
    • https://shopabrang.com/images/files/8836498389.pdfIn PDF document text
    • http://propellerclubsandiego.org/uploads/files/zabamojijedexukinelanebe.pdfIn PDF document text
    • http://starkhigh1972.com/clients/d/dd/dd83d6d7846a033806cdb512e10d7d7c/File/47654108305.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160b687b671394---54927725191.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/rixiged.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077aa3a34ac1---mafemogosidigajewex.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/12782359331.pdfIn PDF document text
    • http://atomleasing.ru/media/File/memovupitenigupomakamis.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098573aac629---74014580716.pdfIn PDF document text
    • http://rcot.by/pics/files/vekisipedatuwumabefuvef.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/joxotabil.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e338d4cc2d---67736541740.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/65803614495.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/2ebcf58e02ab9394e55ba16805a0b338/siramibuvegozimujugit.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796117a064f---26394940387.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/47898688160.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fb7dd5778---81525239453.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921fb944576---padavojafowodo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=best+free+live+wallpaper+app+for+pcPDF 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_off0001097b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001218d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218D 16836 bytes
SHA-256: a4623aff329474cfbdea9fc7efb27a242e3374bfd4dce596f56510fd6edff03d
font_02_sfnt_off00014d52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D52 10576 bytes
SHA-256: 56b1195dc878c7857f8a78e10b9a5e99e470a8c58335bedd690c1cd31cc3b89a

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