Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7a0a3cd582018e2…

MALICIOUS

PDF

77.8 KB Created: 2021-09-25 22:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c77b9e23210719d61533c14d2ba84aa6 SHA-1: bf343841234b6042d66ef4fc1a008b36f0d97ffa SHA-256: c7a0a3cd582018e2eeac66da299e94456e839aa54b092bb1c74b8a6d1f55a208
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://coretry.ru/uplcv?utm_term=resize+wallpaper+android PDF link annotation
    • http://bellamy.tw/uploads/files/202109011152456631.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613478371d77e---tufopevoja.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/dowuxetedukusa.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/24701295798.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/52280301003.pdfIn PDF document text
    • http://wacommerce.net/home/integrity/public_html/ckfinder/userfiles/files/25244547805.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/fukuxaxotimet.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/12668231241.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/46116588877.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/11937108447.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/39044639030.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/53c6f8869af4fd2cd01415e4f1a0ef19/gikavujorurufanobakow.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/161405c86cfc1a---53257485590.pdfIn PDF document text
    • https://foulardfotografando.it/file/94165642400.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/9722270679.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/bebowomivagoxavumujoroli.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/38423916305.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/ac4ee6d5a71f2c23abd6b76ae0bd1230/97994684015.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210910075243.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/nelosozepedudoze.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/rasokikad.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/bomujelorapidelexe.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146d46cc8cdc---xidokibavedu.pdfIn PDF document text
    • https://penzion-palice.cz/content/gebajilug.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B7 10476 bytes
SHA-256: c6b246731de7b57f1e6b05061deb169a0cbbf011d0cf09edf4235a847e2a1d5a
font_01_sfnt_off0000deab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAB 19304 bytes
SHA-256: 3f4d3def6cac499ba23d0c7715075bc04d59863297bd597b9d2a4b4991e733fe
font_02_sfnt_off00011182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11182 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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