Malicious PDF — malware analysis report

Static analysis result for SHA-256 adaca8980a11f772…

MALICIOUS

PDF

88.2 KB Created: 2021-06-27 05:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aab109998da588a0bae659f9ce09959a SHA-1: b06a08dc8680ab13b6a13557e9d2847fe0603f3d SHA-256: adaca8980a11f77299eeedcd6fdad191b49abf2ca8b819401004ffd692a6ad0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, but the structure suggests a link farm designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://nomylo.ru/uplcv?utm_term=legal+reasoning+for+clat+2021 PDF link annotation
    • http://sequirk.ie/userfiles/file/81066743188.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/57781364255.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d396a7dacd---wetijubikifeto.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/ginarabedelemuwajutelu.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160be6b8f23fd3---60995138152.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/9sn3g8u0nbla753b1rq2ijs1k0/betosuxedaki.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608fca4badfd6---vozewifisalelote.pdfIn PDF document text
    • http://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/guzidonoreja.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/25ej10qqmtdeq5s8ldmrdac3rm/berafonevu.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/tawinolumajivenitanixa.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/40769431046.pdfIn PDF document text
    • http://northcity.rs/slike/files/65752636660.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/54995455547.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0c8237489---43962348193.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609227d1cc53f---36540461288.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/96t98vr37iemn29n00m0ouckb2/doremikitivome.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/851a2d61fd9abb25e0956e670788e9f3/taterirer.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160812b2a40dd0---gegozelida.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/f560b293e00af87263995a610942acf6/67270498591.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735ffc21d76---56693767380.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/r0gv1ejtjh1cmup60fd5bul7j7/90182050744.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/45b5c4b85f2ec8a8a5a312f606d5709d/purefunimijanulexusidebiw.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c31ac29958---52678110760.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_off0000f607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF607 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1E 10764 bytes
SHA-256: 792c17516026911c33cd3ab24a6426d086bb312a65194f9f60fbcf2d78297f64
font_02_sfnt_off00012716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12716 17080 bytes
SHA-256: 750613ee56b1e962129c6ab7dad4500785f7a34dc06e91f7d0f521072ae9a3a8

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