Malicious PDF — malware analysis report

Static analysis result for SHA-256 c134e5f83f6ef78c…

MALICIOUS

PDF

74.4 KB Created: 2021-08-28 22:25:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 919ff6af14d26417942b6edd5be34737 SHA-1: 2aa1e4cbed36b97113b13b71e30410f846efd98c SHA-256: c134e5f83f6ef78ceda325094a1aa228147cf87149182d40a1c7c23fa7c6f034
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content. The document body is heavily obfuscated and does not provide direct user-facing text, but the presence of multiple compromised CMS upload links strongly suggests a malicious intent to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/004f0b6s5g2c3p0clogohsnlg7/xodex.pdf In PDF document text
    • https://cottonweb.net/userfiles/file/67842194905.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/51880306789.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/3hhj6psd91eiea7foev8ga7g94/xebimeg.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab850d5da57---biwoseli.pdfIn PDF document text
    • http://apnorajasthan.net/userfiles/file/defakolewujolikuge.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/weponefota.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/619def28c2f35c8e0204c90a1b4fb825/15367886297.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/tam96qq5r8ot06r17u36qt9v9p/zegadot.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/3369280759.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/danofenobadilelajiguxovow.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c13692d4ceb---mumarawajegovukivamapoxa.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/bisorawevodadub.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/madozinegoxafosolikik.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6cb050014---69162022567.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/lexidatafoxukodafaloz.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd430c68d53---58024927820.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/57162967845.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb9d083bc8---81999978815.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/25995887953.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/xulikimemibutuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=cooking+turnip+in+microwavePDF 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_off0000bfa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA0 10880 bytes
SHA-256: 8bf5e0ab250d31bdb166c91266908c0160a04ac570d3291368094de8fceb96ff
font_01_sfnt_off0000d8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF101 16080 bytes
SHA-256: e239954f156044f2a03f81874f7059842e62bbf4f0c6540538b2ff89c286fba8

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