Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fe0243a454a82c4…

MALICIOUS

PDF

85.2 KB Created: 2021-07-26 02:42:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2f6f4dee3d5bd9caf8b33dd6ca0bfb5a SHA-1: a918fe77bd13aed93dd16d2cda3cdff31ff3fe90 SHA-256: 3fe0243a454a82c49a56cfb4f351700f2f2e092914452175ea04b990ccc887a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains multiple links pointing to compromised WordPress upload directories, suggesting a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of numerous links to potentially hosted PDFs on various domains supports the attack pattern of a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160915a0e2c9c9---22246726144.pdf In PDF document text
    • http://compsult.net/userfiles/file/68143301324.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/33439103358.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/98655642275.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/laxotodo.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/6609b62eebdbab2d122e5c29c364b273/sejitokapuzugugevumub.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a02c82ae26---9858377453.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/uhf8u0m9hmkq3v558ljvmsipl0/66895518088.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebe2e48812---34271347465.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608382cfe9a5a---bupawobomul.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1ee9b391a---gavawovemokotoxebo.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c03a7dcf27---99001281418.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/vivirobeniruwirefanizuwa.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/3af46c127926b3478650128ee914b3bb/renevokarirapomivikox.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/7a291dd49ecd7e3d0ace1dd204e6d742/62925446288.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088657cf26df---pepuvorusinid.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/vesilarilojotevobilaligom.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/a52a39b90ed7977f8c4e09b4e5840e1c/kavogiboloxunafimekezow.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607827ca20af0---rijapukokugataruwekaj.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160b74481351dd---mejazezebuve.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/15565971647.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+set+up+voicemail+on+home+phone+verizonPDF 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_off0000e789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE789 17484 bytes
SHA-256: 3f6c19460474569f97fbd54b5e8fd6292735eac4d71a93693df11010040c1734
font_01_sfnt_off00011593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11593 10944 bytes
SHA-256: 7a1ef4f85293296afb5d80368a56466704c69d3497f302d9cef5a4ab6beb60bb
font_02_sfnt_off00012ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ECD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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