Malicious PDF — malware analysis report

Static analysis result for SHA-256 572fd2a554ae3fe1…

MALICIOUS

PDF

80.3 KB Created: 2021-09-08 10:56:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2ee857dc769e4a36bdaadd48930735db SHA-1: 4819b9b1eaaccd48cb3b513e6cab1d52eda2d4a3 SHA-256: 572fd2a554ae3fe1e54297c02b71d3285040b5ef09b8a6e90b6390fad5dcc8f7
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs a social engineering lure, instructing the user to install a browser extension or update to view content, a common tactic for credential theft or malware delivery. The document contains numerous links to external URLs, many hosted on compromised CMS platforms or disposable hosting, suggesting a phishing or malware distribution campaign. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://huntic.ru/uplcv?utm_term=expert+pdf+reader+portable PDF link annotation
    • http://championshipsportsrings.com/clients/23492/File/62931408562.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/netefajivababozupizoki.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/ritinusinubenuze.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/nujakijekesopalenakopa.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/18052536287.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608274c89a500---32059853044.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/245b17d38edc0f0af726ba38d8562a30/pajaxesabe.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/61936363901.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160adb5c9acead---kowuwutefumovapux.pdfIn PDF document text
    • http://karthikeyanjayaram.in/userfiles/file/86700494984.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/ba6ad79cd2909f7f512f07729c12db75/wuzufidodofowebofofaluraj.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/94f173e0cb496297ee7db9769a9f7aa9/beverobino.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/79ln1uv1cf8ab1gd3h7fhb12v0/23006105974.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b9787be2c1a---wexeso.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/mimipux.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/26812731280.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/50108000453.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e4fbf1bbfb---zekoze.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/zekapemenidopen.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/rk5qjelas1ogr580bu0tqmtofr/25196353127.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/sumolobuwoniluferu.pdfIn PDF document text
    • https://atiksigorta.com/files/raruvewerodolupupotim.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca0644a255a---dibidajotopalavulex.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/27a845q9e6rla26d00vt4crub6/fezetom.pdfIn PDF document text
    • https://roomart.uz/ckfinder/userfiles/files/mifubenu.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_off0000d6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF5 10352 bytes
SHA-256: c7ee0faaea7847b71efa002b766fbf13076e4f97853e78562a4e8ef7cc955366
font_02_sfnt_off00010639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10639 17516 bytes
SHA-256: 16b8044f3516078071e0520deae8d570d12cc28052654384c8b3276dae71fe0d

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