Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c9bdfb7aff4b577…

MALICIOUS

PDF

83.3 KB Created: 2021-09-07 23:28:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b4b54849efbd499fb893fcbaf4eef918 SHA-1: 92c1be1717d777e4c7ae7146b7a0998dfbfffbe1 SHA-256: 5c9bdfb7aff4b577450e7ae5938760cdec7c6749c275cad76a5b0ecc14ef182a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs and is flagged as a link farm, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a malicious document, likely delivered as a spearphishing attachment.

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://medvor.ru/uplcv?utm_term=essay+writing+vocabulary+pdf PDF link annotation
    • https://f27szerviz.hu/upload/files/37458533876.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/doludupedaviviwijawalope.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/ndhia0i0up5m6m0tr1a2n3vl48/68999182852.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/rmh365k0v5d6rcb1ihhar689ak/21966774190.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/qjotn9l4qtpf54uq3kv3rf3ccm/rugewezojikajoko.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/timazawinidopalujidod.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///83269383088.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/88482903430.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa08f414c88---gugonewusonuval.pdfIn PDF document text
    • http://daiquangsico.com/img_duhoc/files/25728686665.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/vorolifitegisinaj.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/5fhnstfdd91bbc5pja5lgprjt7/wavivojedakage.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/33807061791.pdfIn PDF document text
    • http://ubest.ru/images/file/28986968877.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071eea62e218---kiponexajamasakibirejid.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/791a2247d55404aae2fc9a1ac82299f1/jajuwuribarejurisu.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/27500393319.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/gidiliguxisa.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/0d3d852ea1f84208072e41fd132bec79/91603311917.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/a7f80a390a37933dfc8234ff750ae9c9/vakeviviv.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/7695140642.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/kodovelad.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/kerabojakugakazope.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/f323970a15262e6d9f9d2eedd1f8d758/bumoji.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/9e0d5b9d3068fede24627db94c042a47/87358157021.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_off0000e213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE213 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA25 16948 bytes
SHA-256: f58e223cebe439755cfb4b3300e07c674be1570e242306780fb0c6cb92ea6e4a
font_02_sfnt_off0001257b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257B 11152 bytes
SHA-256: 751cd542855edf95401dc105382b8da291f1af0dab03b334033a3589e0487c8d

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