Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cb55c732cb382f6…

MALICIOUS

PDF

78.7 KB Created: 2021-09-05 19:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9cd70ed55c4fad14525ac7d4d28130ba SHA-1: 760a50bda4b4cff6367a12d38c3d25d36f6b3f88 SHA-256: 5cb55c732cb382f6c23ab0372f38b38b461a4625000b9aaa87ab104fd90cdde3
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, suggesting an attempt to host and distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The primary attack vector appears to be a link farm designed to trick users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/95c24c1582631b30e8e999db1a17fece/watemu.pdf In PDF document text
    • http://volkshilfe-ktn.at/images/content/files/40786428448.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607988254634f---bokixaf.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d6619e85132---budipaba.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/sopeguzof.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd842f5c16d---97715555824.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9361f19df8---fipabogukixujusizavo.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/58069993052.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/vawol.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/9017324920.pdfIn PDF document text
    • http://mwcapital.net//ckfinder/userfiles/files/fatojutadekuwasu.pdfIn PDF document text
    • http://edumedcare.pl/upload/files/bipuginagikeverojewomu.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5955de7e1---dizajunuxa.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/kawilebiporexamisek.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/tewajojuvaparane.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e59a39b02---fomibetuvuvizesit.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16075cfea24468---38225578629.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/guxizixetefomomemubafuxin.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210818061629.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/c14i6005g6b57h7c926jj156l1/1604650842.pdfIn PDF document text
    • http://erex.hu/upload/file/pefazarub.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/61352641057.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077218e15311---78713821770.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/kisinub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=reproducibilidad+en+quimica+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_off0000cf9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9A 10948 bytes
SHA-256: cdabdc92fd93a25cdfd0378e22b3a552f934cbb3d0d4bb32402498eb61e9ff4a
font_01_sfnt_off0000e868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE868 17672 bytes
SHA-256: 0eb33af8c9e66c5566b2f8a360d7f5f987c229d51831fd6a1e93c8104b0bde00
font_02_sfnt_off000114d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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