Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fc88de19bc64bea…

MALICIOUS

PDF

69.8 KB Created: 2021-10-03 00:15:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 51ec9188d505fe75a7f8a2f09e3c4a80 SHA-1: 42f423ef2fff41f25a980763c5f76e021fa4fda1 SHA-256: 7fc88de19bc64bea5352add5be77a6c430916cf69115f9cf6ef1a675a52948f0
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are associated with link farms and potentially compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://scamps.biz/userfiles/file/10187817429.pdf In PDF document text
    • http://hyunsin.net/userfiles/file/tuxogitabejazofuligas.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/55562582325.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7b4f886e9---88259612434.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/36468362915.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138ecf72c2cd---fakute.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/56776894069.pdfIn PDF document text
    • http://dnestrovsk.es-pmr.com/constructor/dnestrovsk/ckfinder/userfiles/files/deridef.pdfIn PDF document text
    • http://coumert.com/images/file/18859002720.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/45307364773.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/nuwowesarimevilefuz.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/71965553998.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/mufizisudevupojizile.pdfIn PDF document text
    • https://shiksha24.com/userfiles/files/doketadafutogevofenuzopo.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/suzosalit.pdfIn PDF document text
    • https://basisnomor.com/contents/files/femovisazulogegoxesinazes.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/d1b75f69bd47dec5089f9350739087be/wewoxul.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/81903937587.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/wiwaretoderatufugafodojab.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/nipozovimodipijake.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/36a882be2dd75467959c7db83a0450f7/lajuwuravedamezotez.pdfIn PDF document text
    • http://standdominica.org/files/files/jitap.pdfIn PDF document text
    • http://e-hematologica.pl/users/file/72770172191.pdfIn PDF document text
    • http://koutingchina.com/upload/files/13978556105.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=sushant+and+dhoniPDF 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_off0000b0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0BB 10244 bytes
SHA-256: 6e87b5e64c1be5259a7430b87020b459d0155f284ef5685185de3a01b2d81799
font_01_sfnt_off0000c7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A3 16644 bytes
SHA-256: dcfe0a46362cd011e2ac91a47cd57514ffa393a039a97295542bfb1e779c6560
font_02_sfnt_off0000f1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1