Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ca7d5ea7792ad75…

MALICIOUS

PDF

70.9 KB Created: 2021-09-25 15:25:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 42f05604450375f09e5ebea452cf6c45 SHA-1: 4a422a79a1d47f5d13f9886e01971aae6c01e645 SHA-256: 7ca7d5ea7792ad75cbcfe293b11b5aca15bd54f6da60f285c45790ed01c81eed
96 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple domains, several of which are identified as compromised CMS uploads or disposable hosting. The ML classifier strongly indicates maliciousness. The primary attack pattern observed is the use of a link farm to redirect users to potentially harmful external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e61dd93595---zitufobebafojijijibok.pdf In PDF document text
    • http://tsuiteru66.com/userfiles/file/sevativupojidix.pdfIn PDF document text
    • https://biomisszio.hu/tmp/gebevononezebipus.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/ziwivitoguge.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/33210549799.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/jiladexoneponup.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/2089647578613867007caaf.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/zakodisatawesi.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/12538047402.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/65805631633.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/9639201888.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/wasosupoxetutebozejigeje.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/14842943431.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/voloxerim.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/acf8b9f4a17a7b429dc623ea320bcc81/tipixowoge.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/wopipiraketatolib.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/nawazafalegaramofive.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/35777563150.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/sosegikumunurajekuz.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/smgb1u9ehb0ugrjlbuhvp0vcbq/29132202939.pdfIn PDF document text
    • http://allycatering.com/userfiles/xibafakuwisi.pdfIn PDF document text
    • http://esejsc.com/upload/files/77576947735.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/44184729333.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/83837545280.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=haruki+murakami+hear+the+wind+sing+pdfPDF 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_off0000b162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB162 11048 bytes
SHA-256: 861b33279e7b915f87d610fa53304e48783c42ef9a56ba31e66beb9c129072f8
font_01_sfnt_off0000cab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB8 17100 bytes
SHA-256: 09207df2c613123d88d594b56b2c9c2e0144eb8a137bc4b5c8ca498e7334071b
font_02_sfnt_off0000f614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF614 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1