Malicious PDF — malware analysis report

Static analysis result for SHA-256 01caf85457d14bb5…

MALICIOUS

PDF

82.3 KB Created: 2021-08-21 10:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7bcb4a299adee4d9cefdc30d38ac9885 SHA-1: 3f7c93765f736edffd9704017cf530a84b4a2cee SHA-256: 01caf85457d14bb53dc4d48dc3a1f9d6f34cdd957a2f4900db197046903c521b
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or other disposable hosting. The ML classifier strongly indicates maliciousness, and the structure suggests a link farm designed to manipulate search engine results or redirect users to malicious content. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cructi.ru/uplcv?utm_term=chambre+d%27hotes+avec+jacuzzi+privatif+annecy PDF link annotation
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844bd64746e---90966973391.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/17310347374.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/jiwelus.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/nozeradik.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/moginidajodut.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/xugudekazawijukebizu.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/gujok.pdfIn PDF document text
    • http://edumedcare.pl/upload/files/simivuxitifefi.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b11530f1c4---fapanojadazeg.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607386723d365---dalogepuvubiwub.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/14342588146.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c608b8bddc---mebejutaxabomatesuz.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b53856ed2ed---43174032891.pdfIn PDF document text
    • http://yves-segers.be/userfiles/files/48865988179.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/954cd64967aee77881016b919104b1a4/fezejebedefixekuvi.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/murumiwamemokofilimizenax.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/53l09onrm5fp4cr9mj7hd9hn5i/nateg.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e358366f2bc---bulakezujabeg.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/71f49d70e7117712a359142a97a12bc2/nibapazan.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/91066002777.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/51156645507.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf5b2bb81d---97692901677.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/d7e503bf4f582f9ec1e5ebe3f507e67c/74971878227.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_off0000d987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD987 18700 bytes
SHA-256: bc14b22686781524e5082b86c9837400c3fc053835f8cdaeef51c9756bcf0ac2
font_01_sfnt_off0001083a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12051 11516 bytes
SHA-256: 51d6cdae6ebe330177339c64bad2bfbcac8cd5002f3a7a50c6be17a9e66dca90