Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3fa1e8860683711…

MALICIOUS

PDF

92.5 KB Created: 2021-09-06 14:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 39f96ba6db23483546b8f1468895c79c SHA-1: 85e31b149e432229b111442eb4d55f7976a9370d SHA-256: c3fa1e8860683711f7c04d1f2ba6d1cc490465e3349662a74a00f638420ec2d2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the PDF structure and URL analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://tndgdemo2.com/ckfinder/userfiles/files/xavitavetimasadozafuwul.pdf In PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/442o58dsbrieq4tfr1bk3qugr5/tewonuzewedazolikusuvinu.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/rowakenilugoto.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/zefolufamakaretul.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/murav.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/dolina.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756678cbc17---togizegisagewimowevu.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/80186700287.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///waxij.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/xizonolifuto.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cacfa5e80---dakuw.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/bdb946eb3527df21d998fddd8b708d2b/95817395353.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/33e7438731303ff9a19086a16e025b69/kagodasepatadubelimixajuv.pdfIn PDF document text
    • https://renetravel.ro/images/files/pisopasozepelevazu.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a97595c0eef---xuxesifijekod.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/ac8366c2b11196912752c2e52d6b29d2/35787032655.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613175dd0aecd---85674788788.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/sonupavepogusarofanoriril.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/f4785ca1eeecb5cce29935807ed80fb0/96513389969.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/665811a9e91972962cac9ac299b1ea2c/togubufukunabunenaganisi.pdfIn PDF document text
    • http://otohyundaidanang.com/uploads/image/files/pawozozagorobudina.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/714gh2i63b7t9bjnltfq38a13n/gefali.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/30206867388.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/72639801818.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=political+stability+in+south+africa+pdfPDF 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_off000104f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F3 10940 bytes
SHA-256: a4c0647e08b620159d224087f960711ad48b6e6e4ddcacf1b3eca0878dd10e35
font_01_sfnt_off00011e0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0A 17988 bytes
SHA-256: 6f9ca7d5e4e7a9d68b9ac8bdf335b461ab801bd8f0dd850ec033ca3176f9d28c
font_02_sfnt_off00014c76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1