Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7393c88c2fb2d2b…

MALICIOUS

PDF

71.5 KB Created: 2021-09-26 16:20:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6ec35bd7c00e97b3a0731369f95ca4d2 SHA-1: 6195dc0bcc3f107e5f9528c238ffa0e3bdce1caf SHA-256: c7393c88c2fb2d2bb829af993026e413651c33eb34da34da8c863fdafe195c29
156 Risk Score

Malware Insights

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

This PDF file was detected as a phishing trojan by ClamAV and a machine learning classifier. It functions as a link farm, containing numerous URLs pointing to various websites, many of which are hosted on compromised CMS uploads. The primary purpose appears to be directing users to external, potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614266aeb6970---somituwejumefapap.pdf In PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/29312951027.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/57847187122.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/55714802394.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/26abd945b7c87484da4e1baff94d158c/wesurib.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/31912285910.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/bekumox.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ef1d114585eb949e74c2a9bb8b680446/bizumoxofagizi.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/2782731177.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/75359874571.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/xorigokezodojufipirekori.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/vokoxegefoxavixat.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/74603023526.pdfIn PDF document text
    • http://aprt1day.ru/file/nopuniradorow.pdfIn PDF document text
    • http://checopharma.com/upload/files/bakomuzotalipowup.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/43405409537.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/8390023330.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/nilirozexitikim.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c91fdde85---86748266352.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/kekupovuganonezuvupi.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614deb4a2d76d---nabipezifanilafexuwoxuze.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/dorazokix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=nonton+film+seed+of+chucky+full+moviePDF 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_off0000b129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB129 10828 bytes
SHA-256: de05cd210601e648a16c5a7adc2a3bd53fdfacf27d2b1a648e7edfff007bb88a
font_01_sfnt_off0000c9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FD 18104 bytes
SHA-256: 9c6197e729eda00fc4920683f2d602e5aa0a74d4dc818b8c87a757ef417919b7
font_02_sfnt_off0000f8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1