Malicious PDF — malware analysis report

Static analysis result for SHA-256 79be141f8a499a9a…

MALICIOUS

PDF

80.8 KB Created: 2021-09-16 18:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 298bef36e4936f1ef295731ac5b4e528 SHA-1: bbdb70b3f24eb278bf29d614f9624e11a1b74215 SHA-256: 79be141f8a499a9a077da867160cc1aa726dfd8e20113ffec6ce33e9f7c03802
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://allytemp.ru/uplcv?utm_term=shadow+fight+2+apk+unlimited+money PDF link annotation
    • http://coreaad.com/DreamDataUpload/file/58331668987.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/maregudasu.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/kipitaditexif.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/8829548156.pdfIn PDF document text
    • https://ultralloy.net/upload/files/bofojovonuwukuw.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/dukubigilakuverekazoxime.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/84544156604.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140e1db046ed---73693798225.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/10622180227.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfb9f3faeb---29593710693.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/47522ea20c69492a4bea674af5339fb7/xituliro.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309d720be87---bexudelajavibarobolitefi.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/gutimosedewokasumobima.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/49895835177.pdfIn PDF document text
    • http://pi-consulting.ch/download/sogarasarukovogoju.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/84439521994.pdfIn PDF document text
    • http://hobbes-group.com/upload/files/rimogekakagiwirarajewadom.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16132711b69dd9---neviviwabemalutapajanujag.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/61973323571.pdfIn PDF document text
    • http://kieryk.pl/img/userfiles/file/40618875455.pdfIn PDF document text
    • https://eliteprotectiveservices.net/ckfinder/userfiles/files/fewuk.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_off0000d5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ede3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE3 17636 bytes
SHA-256: 37a6a8c5aab8a8abe0c3a65c7c3fecd8119440ac780539d3dbee61d6ec392299
font_02_sfnt_off00011b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B87 11264 bytes
SHA-256: a7c2e1133b0f2b5f28615a0bdc66424fc8a9d196e82dfe010ed061af846aaf78