Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cb043f968e5c200…

MALICIOUS

PDF

107.5 KB Created: 2021-09-01 20:10:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8a22c2ba939a296a46e20182ae6109ec SHA-1: ad8a151aac6ccd8686ec9af6d6e22d2ba35481ea SHA-256: 1cb043f968e5c200ed555aff43d9f93c76d0cafd847ef2103d00fa8f9ce37514
96 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains numerous links to compromised websites. The document's structure suggests it's designed as a link farm, likely to redirect users to phishing pages or download further malicious content. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 5

  • 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 https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c997bb8dbc4---97574895815.pdf In PDF document text
    • https://thietbixanh.net/uploads/files/99914014548.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/18615357336.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/90764379155.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/o0kbeg1k4df48pf8qiq5668eg2/72701154531.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16082ae53a4e4e---xinusekifuwetori.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/47907439363.pdfIn PDF document text
    • http://gachbinhduong.com/upload/file/10052549255.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0b59aa13c---3297418095.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/ec0b5b60814876440cffed9daf28aeaa/59185812972.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160745d2766f93---34451164474.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/e6026f18303955df129aa5b93fca9a98/33283229188.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/51070136330.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/95173346986.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084b56d1f489---22587992710.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/ginevew.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/b85e1eca99719cf5db0c600e05f8ce60/mozuzibidasirasegagixod.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/34b0457e4a055225dcbad72c794e2ea1/90456286923.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160700fc7d2666---48289431034.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/83431907677.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/ca4cf668620089d7ed6bb5d75049a3e6/kimakoreforuxelakusokasef.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/18580250075.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/bedelinizudigomo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=the+4+madhabsPDF 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_off00013656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13656 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E68 22620 bytes
SHA-256: 8d0a892aab1fc5307eac0bb4012268e81695f239c812ec43fe6be520548236a8
font_02_sfnt_off0001891c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1891C 10132 bytes
SHA-256: 75a40955bfedb53408cd693e8d18d7e56bc90c8719dbcd0854a7ae4aefc56a6b

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