Malicious PDF — malware analysis report

Static analysis result for SHA-256 fce2aa33c3c90499…

MALICIOUS

PDF

80.9 KB Created: 2021-09-20 03:16:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 999088a98ec20008be698369c2f2a50e SHA-1: e0a457c53c27c51299640a0e7e1976d1f8f5c9ef SHA-256: fce2aa33c3c904997564997812f6f8194fea59155338f57b69705fc70293e1d6
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating its purpose is to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=harry+potter+half+blood+prince+pc+game+download PDF link annotation
    • https://flyags.com/editorResources/file///janonanoboxemepagonezozu.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324599ae65d---62948906190.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/zixibifunobaruposu.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/wodaledobolutidiga.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/23449374928.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/sukuguruj.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/suzurafepij.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/bubavewonuru.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/78086690917.pdfIn PDF document text
    • http://usateatop.com/_upload/files/2619150356.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/161439484c1523---86626477988.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/32632691630.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/kawejukelar.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/pominubesavutaw.pdfIn PDF document text
    • http://cga82.com/admin/File/80341653389.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/rinigodifemazewek.pdfIn PDF document text
    • https://alicantea.centralcms.cloud/galeria/files/vesosidelewera.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131b0aa8299f---68727439106.pdfIn PDF document text
    • http://jadeite.ru/images/file/16969471451.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/xidewulewirogatefukad.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/52473234626.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/dabevomedozodirasape.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_off0000d8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E2 16936 bytes
SHA-256: 4e5071149b06f24739e5aed3854886d428db0d44cb6532c096fa56dae9a069bb
font_01_sfnt_off0001043b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043B 11228 bytes
SHA-256: 0635a5a0bb7d4dbdde59fd963a459be5b36601b7cfb10faadc9638a429dea0cd
font_02_sfnt_off00011deb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1