Malicious PDF — malware analysis report

Static analysis result for SHA-256 93b59cb042360549…

MALICIOUS

PDF

84.6 KB Created: 2021-09-05 09:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 32ca9de5e45a32cc0ff2da1957aa2fc1 SHA-1: 96a58105bcabcf0e2c8fd3975ad660ea9a7e539e SHA-256: 93b59cb0423605491801b0e1d32b151748f6648fe9732d3218bc45b6ebb140a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links pointing to various websites, many of which appear to be compromised WordPress installations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://pistant.ru/uplcv?utm_term=reasoning+with+democratic+values+pdf PDF link annotation
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc60b977e6---76521882005.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a47dff4d157---15684600354.pdfIn PDF document text
    • https://noventa.cz/media/files/file/rivumixesuxiza.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/12248328867.pdfIn PDF document text
    • https://primer-spb.ru/files/files/mavulinuw.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16075dd607eef1---vogej.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e31f776a1---72948624151.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/83112622049.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/08/25/file/88108286741.pdfIn PDF document text
    • http://thecobbfr.com/clients/4/43/4363d5a08aa72aedcf7f7d4dd0675897/File/bitowererozi.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/42gnbrbnbvr4trmhbrkr92aoqh/85577835176.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/rhlensrb6net4pdclnbjg4g7sf/52840150763.pdfIn PDF document text
    • http://envigest.cz/upload/file/pewovujigotoluri.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/86353411831.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/matek.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/578a63119014212d0d8c34866bf884e6/dekusorulifirup.pdfIn PDF document text
    • http://wamer.org/userfiles/file/fusagavep.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/58101217338.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/aede44877146d008e34dc405de4c7f05/luvalufipatifidaged.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16084169257c53---vevovejizumexewu.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aaae0868d1---86746755820.pdfIn PDF document text
    • http://casms.org/atts/news-files/file/welefabej.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfe74b8f9a---91396209863.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/35291744765.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000e041.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE041 19152 bytes
SHA-256: 40401058ae4b506b1e16eb8671dc17f2d3fe7897f60af2e450e496ddc06bd03d
font_00_sfnt_off0000c5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5DA 11364 bytes
SHA-256: 4b74a5b991e776c5bc90e68a542102ec9212c77ce234ae429bc883a4714cf938
font_02_sfnt_off0000ff3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001174e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174E 17120 bytes
SHA-256: f9171dc9d42d45954d7fa0aaee07bfd268ca59558c5254e42e8529cde4d00fe8

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