Malicious PDF — malware analysis report

Static analysis result for SHA-256 364e6ed94bbe52aa…

MALICIOUS

PDF

97.9 KB Created: 2021-09-18 21:13:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ef6f78ad29f4f26115dd07f5792448cb SHA-1: 46a7f31b4e9c5855372ccdb2669eed255e965ff8 SHA-256: 364e6ed94bbe52aa26b4ce0ff8e3f2c1f2c0b6ac633412de589fa984dec86b7f
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of link farms hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick the user into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://venusnvs.com/userfiles/file/85948280947.pdf In PDF document text
    • http://namlinhchisapa.com/userfiles/image/file/bomekinirad.pdfIn PDF document text
    • https://koratspring.com/upload/file/90602154534.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/l65dm2s7d4lltv12789ag2ggeg/wofodiwep.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/787dcad1afb44e20b7e38e7e7d937db7/genero.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/20999849708.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/41234989495.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/fuvuz.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/ludidefisero.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/56fe712c195c9e17ab96041c704c92f0/rajuredijip.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/poraberizixukanudamifut.pdfIn PDF document text
    • https://asken.as/bilder/file/53913361300.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/88451000395.pdfIn PDF document text
    • https://chptravel.ir/data/file/mufuzubizawa.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/nexabeseva.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/45418577113.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/nebutuxirakuwezo.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/23874610176.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb8549db90---92945655821.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/35511597480.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613503db43184---nubewezuxunuriloke.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/kujafapigojezudu.pdfIn PDF document text
    • http://ping-property.com/user_img/files/nemegixizuzokopiw.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/84028500658.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/kafotifixuzasuvedu.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/guzamexogoved.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=zuk+z1+romPDF 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_off00011981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11981 9736 bytes
SHA-256: 43dfb5dc1c6d0ac805607994e71e5c416bca9c83a69b154dcc65de3a24c8aa5e
font_01_sfnt_off00012ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000146e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146E4 19252 bytes
SHA-256: 17fd93f1dd587cc8b4d5d726ecc6534f8a08654a89045f971d1391c587ef7b44