Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bdd9401feca7a07…

MALICIOUS

PDF

99.7 KB Created: 2021-08-04 13:38:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e72a64c9a5852e9e73548d712db32520 SHA-1: 3c576c11f246632fcb4c7c39703ec73ff00e8208 SHA-256: 1bdd9401feca7a07b1a011e11000cb2823ddbb44858c63c6d937622c8e688a50
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS platforms or disposable domains. The embedded URLs suggest an attempt to redirect the user to malicious content, likely for phishing or further malware delivery. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://romanakladatelstvi.cz/userfiles/file/zotawamabumu.pdf In PDF document text
    • http://noithattamphuong.com/upload/files/nabasisotakix.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/69564019926.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/milelow.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/8354356403.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/90039184500.pdfIn PDF document text
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/85438530246.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc5e8b02ab---sumoraponedub.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/zidoxupofupotozal.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/8d526537647c322cc109e7fc81ff1e4d/xololarux.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/86931457483.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/g5hc1henfok58d2jb7ig6qo3o5/junatina.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/pefd5t0qlrh6cb5frl1tm15v7e/29827634528.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160911f9223a13---wonibirisef.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/buxusokupituxowi.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b6035f305ce---65922359138.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b24d67e7fef---sulavolupedubifudebewuwog.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/8496948989.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfee1c229f---wilozigifaze.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/gag0ukc8qn545vog0k0de8s7vc/4071217174.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/b15950e0d12094dafefaa778a49f324e/19649915676.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2850d19d53---43224376743.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/difazox.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83960883c0---lizazaloguvewulurita.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/18646692338.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=mexican+american+war+worksheets+4th+gradePDF 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_off00011d02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D02 18092 bytes
SHA-256: 2d7dabd9a2a55525dda60315442bd325d1610530f9bf56d07ea85c7bb80f5c29
font_01_sfnt_off00014c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C24 11124 bytes
SHA-256: 4c015bc5b7ec5f165dc9d3658a9a64e7c49f708cd91573e5daf3939cbee64b93
font_02_sfnt_off000165d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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