Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d3b1235beb8e2f0…

MALICIOUS

PDF

80.4 KB Created: 2021-07-04 23:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 90a9af1f60eb81f901dcfa01a8ad93d2 SHA-1: 01533bdbc6633f7ad07263fbdfa20de4a075a7d8 SHA-256: 4d3b1235beb8e2f012628fd390175418a36d075f7f52d6e8db97a9680c880e40
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress sites and other disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farms suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6061

Heuristics 5

  • 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
  • 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://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/87kjooggi937bo7hbng754ch6t/gumopavigogapozapifeje.pdf In PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/mi02l7s2i9d8os7l6lhm89u5s7/28543701058.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/bb65619b5b13e307e9eb336d46882062/40141060637.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/gukuvabo.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/newezipakazidulusox.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/0a4286b35062db9de34fdc1fcaf47632/batefare.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/vo61795a287aaj58thpq0q7ul1/jopolowef.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/eijda4i6mrlgms0rnk325tmihd/dorokopifedenebupirabu.pdfIn PDF document text
    • http://honda-vo.com/upload/file/25313292229.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/20457a6df7bd83cd87254e2e2804378c/fopaledogeremesivabomij.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16090bf0d93bd9---18955945599.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/3b19663282de5bcb5ec3dd2bb6e359b6/jurofagododob.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/89636780216.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071cbf65602f---nowoxa.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/32320369806.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/20885494997.pdfIn PDF document text
    • http://glcore.net/ckfinder/userfiles/files/18102077792.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/43014266024.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/c0e4787c81e462dc44fe0fb05732856b/mazamanolixumujex.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/gpo9kiqcpv1vastl69f7s4hum6/simipolugifatuzibojan.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/04a50f45f58663899be912556f46500d/87166697814.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/zipewofopuvobuluvidofo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=chester+county+court+docket+sheetsPDF link annotation
    • 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_off0000e61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61D 17368 bytes
SHA-256: 069b72c0695f6d3dfa21adff9d5be7b8401eb06ac979432ebac65d39bf16d6f4
font_01_sfnt_off00011308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11308 10504 bytes
SHA-256: f4a9204f22fd9dc2d1851733dbbc4710edbab020e88e289406c7413c6081d7e1
font_02_sfnt_off00012af9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1