Malicious PDF — malware analysis report

Static analysis result for SHA-256 884e87a81d8b05ab…

MALICIOUS

PDF

80.0 KB Created: 2021-09-14 08:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e890ff88f2fa838deca9c1be9a636bde SHA-1: f6f5686c6af39738a0f0a23c412e7cacc6bf6d55 SHA-256: 884e87a81d8b05abfd01794882fcb2de8e84214d0729362f897f509a6c80010b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of external URIs and link farm characteristics strongly indicates a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://huntic.ru/uplcv?utm_term=sdk+tools+directory+is+missing PDF link annotation
    • https://hgb.se/filer/file/4408773390.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/podanuwamomofifigilojali.pdfIn PDF document text
    • http://mayingiabao.com/upload/files/28379975645.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210909064834.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/mijoludije.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/82c5feb94143017307c4d8b0ea32b3dc/4032623751.pdfIn PDF document text
    • https://avflash.nl/upload/files/gobonidedovukusoso.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/zinebofezopadumere.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/punubu.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/niwalitilefefegasapufozut.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/13850776059.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/milizigeno.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/161387103ec8c3---vibukowudidagusekutuvoz.pdfIn PDF document text
    • https://bloc-immo.com/images/13547899766.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a429ddc570---mopavimof.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/23492728275.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/75830906057.pdfIn PDF document text
    • http://khunghinhdepphuctin.com/media/ftp/file/88785337595.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/xirokoredaboguwikibemaku.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/538868692.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e07a4192d8---virosepenefigumapo.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109020329487492.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_off0000d40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40F 17392 bytes
SHA-256: 18841f78c81ca3123a7b3fc11ccf5edcf98f6ea94ea6b6b620f70155074568f9
font_01_sfnt_off000101f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F4 10832 bytes
SHA-256: 6a101179cf419ba06a13c571763c444c23d840deff79348ba6fe3e80d2d0e311
font_02_sfnt_off00011aba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1