Malicious PDF — malware analysis report

Static analysis result for SHA-256 00f6c3c5e1ec944a…

MALICIOUS

PDF

86.9 KB Created: 2021-08-07 00:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b6d7d55429a27d2f41b9f04eef45bbad SHA-1: d0ccd796aecf6267b770661449f30125767d9ec8 SHA-256: 00f6c3c5e1ec944a75a66c2bf70393b8a28637c3afe6aa3237c6c82ff3df2f0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS upload directories and disposable domains, a common tactic for distributing malicious content or conducting phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://monyetmesum.com/contents//files/51025342308.pdf In PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a614bd08813---35722753736.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1d07bced6---kutogifovutisizesujofud.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cd64c7c0c---97165815094.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/65425667319.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/95960414604.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/kixazuborulotisunufutivam.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/xugovekefosugit.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/majisaretutul.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/sebivat.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/voziranezit.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/0b7b4049412bf91e6d0b74d7f6180c52/38391502666.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9d33612b1---najipawiduvode.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/6uq3ca63oj49jtjjksgv86sisq/zebidawebikarumo.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/07551029f70ff9af0a4f343412cca9b1/xofuxofituv.pdfIn PDF document text
    • http://richardarnoldalumni.com/clients/a/ad/ad1dcfa6f69ac51e3fe6bec18f6cf6d6/File/kisosatuzelugebamobi.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/midunowoxoje.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/15972269681.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/5v5l3sdsoab6nsj1j9397hls50/mefizipazivozeramimububu.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202107file/2021070103421670554.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/jidad.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/80427398332.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/721c5e7da794a2de7d1cca965f68246f/32247750033.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=what+weight+qualifies+for+gastric+bypassPDF 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_off0000efc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC2 11232 bytes
SHA-256: 25004e48209b9bb82c3121d2d4b5f0821a2bc79234bac8c506816be6e3a58fe8
font_01_sfnt_off000109c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C6 16656 bytes
SHA-256: bb2c4d6cb879e4b81a7fe062e952a6fbbe73fc9a7ae765679c5d1d033e7ca462
font_02_sfnt_off000134db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1