Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6cd942d09fa6035…

MALICIOUS

PDF

76.7 KB Created: 2021-10-13 11:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 106c2b30c725f646aae652dfe6eb0e3f SHA-1: 65c7086641e2b314842cc28551ef6018fc211c9b SHA-256: b6cd942d09fa6035548617e46981823de40ecdeb89f5b373d10f4264c961fb87
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. These elements strongly suggest the PDF's purpose is to redirect users to malicious websites, likely for phishing or malware distribution. The ClamAV detection and ML classifier further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=congruence+real+life+example PDF link annotation
    • http://columb-sklep.pl/userfiles/file/mevuleraxutatarotigebuser.pdfIn PDF document text
    • http://vo23.ru/upload/file/zaferanuduxaraf.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/likekesef.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/45294156093.pdfIn PDF document text
    • http://zzquansu.cn/d/files/34428343560.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/fivebulisikoverimi.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615c73180bf4c---14194956523.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/87952828823.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/73682868370.pdfIn PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/10604587639.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/33312084430.pdfIn PDF document text
    • http://pataibicaj.hu/userfiles/file/43416237011.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/78958685039.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/murusiwizaberojisub.pdfIn PDF document text
    • http://kvrhousing.com/uploads/71422714673.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/goniluxiwelubagijipoba.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161405b295dae4---wijakukube.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615f6a9178e15---lojijevajelofeletitijufin.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/kevukegipev.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/39967199608.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/23091142273.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136c276a82a5---96447386527.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/34356029320.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_off0000c91d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC91D 10788 bytes
SHA-256: b65e5ea904d20c8682f2f2411f046c799829861bdad6b3868d5d5c40ec94f112
font_01_sfnt_off0000e1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA09 16980 bytes
SHA-256: 2824f6eac32d7401c91d84bc7cf1712e95850c7a8bec92ccfe0a0ff46050bff8

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