Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eece266863665d3…

MALICIOUS

PDF

77.5 KB Created: 2021-08-27 19:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 1826ac2119611a551c6d69a5a45b6a37 SHA-1: 2b7683fc372a18be82b8e2b045992728dfd30c02 SHA-256: 9eece266863665d346d03cfd50250cdcac1dca43b23248dbdb4c318aeb4cac1e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with several pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://vanharteyoga.nl/uploads/files/55724690122.pdf In PDF document text
    • http://kaiyudachem.com/filespath/files/20210825035459.pdfIn PDF document text
    • http://newmob.it/userfiles/files/mabejizitejesojepob.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/uq5q7q8j5q8d7gopif7u3j21n5/6433764050.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/dujikaxebelodo.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/pubimutupapezagomu.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/malumewariwaputavasox.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/nebajudekinoxifunur.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/52642855117.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/valepofefojekiwivoxoxoj.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/pofuj.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160726ef0045ac---xajolanepuromipagomuvodol.pdfIn PDF document text
    • https://actor-conseil.com/files/file/92313168480.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/kupem.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68863302065.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/20600739076.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160744330f1728---99379136773.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///37185943349.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/7jl4eoluvqu8tfalhm4cne8th6/muvemibebaxekuxifav.pdfIn PDF document text
    • https://beatmuellerfoto.ch/userfiles/files/83673938173.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/65021992464.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/1238703195.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/fonijadiresa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=swat+on+mapPDF link annotation
    • https://tes-sys.com/uploads/ckfinder/files/20210701/16251275819568.pdfIn PDF document text
    • 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_off0000cdc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC9 10036 bytes
SHA-256: 9a068d9aff264ced3c35dfca317878fe145bd9e09b672da40531d2850a232256
font_01_sfnt_off0000e423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE423 17200 bytes
SHA-256: 7bf40474ed232bebabfa6901966efda379f5decde4c4bff2548ab46625ed06e3
font_02_sfnt_off00011065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11065 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1