Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6e7bab8262f801b…

MALICIOUS

PDF

87.0 KB Created: 2021-09-08 16:14:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e4567a5e885277ec6940dc1eb8ecebbb SHA-1: b0bf4ad40313c3635678dd12e2b1d0ae361c94c7 SHA-256: c6e7bab8262f801b3a8c0815cbe2d6cc48fca7ea78a83b25d8e8c36504bc7af0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to potentially compromised or disposable hosting sites, indicated by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://assotechne.eu/userfiles/files/81450335660.pdf In PDF document text
    • http://epilia.com/upload/FCKEditorfile/putikevarexofiregomi.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/dezodofubuludezijivor.pdfIn PDF document text
    • http://lifecontinues.ru/images/files/37544525412.pdfIn PDF document text
    • http://www.moyekolodin.com/files/figipipazimofugovosutu.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/bunenela.pdfIn PDF document text
    • http://planbmedia.hu/files/47051202737.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/vejakisefibotedapa.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/mubuxosu.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/77024332827.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/balovubaxabevixuvod.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/33655741401.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/kifatarekozawudepigu.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/10678749169.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/58731394984.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/7a0e39f03ffd74ffd5ea5027619aa014/45561365041.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/fakiditamomesezuseko.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/3bf2dfd54a048c972e01a01f6207dd26/65241886485.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/fopexanupamalibufafepom.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2e32c81d334ff508e16ba1f6e3e60256/mofawozepidubeji.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/35526181312.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/35527157519.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/52292840527.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=beckett+price+guide+pdfPDF link annotation
    • 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_off0000ee2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2F 10440 bytes
SHA-256: e437c7e21445d55aa956dec17d1c6b0a458cc795111c3294f1c2ff0803fe3f84
font_01_sfnt_off000105cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CF 18512 bytes
SHA-256: e8d784dfe5e2ef2173df39594d9c988b4bf677f81885c3d7fb6736b90970b7ea
font_02_sfnt_off000136b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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