Malicious PDF — malware analysis report

Static analysis result for SHA-256 45bfbe2e759d0cc0…

MALICIOUS

PDF

69.1 KB Created: 2021-10-05 16:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6f8f64c99f2c70223fcdec935331a190 SHA-1: 9a811929becc78715b7081cbee33461c6ce9530b SHA-256: 45bfbe2e759d0cc0a4cc03761310590af855bbc52bdf672623946ef5edef78b9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm hosted on potentially compromised or disposable domains, designed to redirect users to other PDF files. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the structure and URL patterns suggest an attempt to distribute further malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://easy2ticket.com/upload/files/sudaxojon.pdf In PDF document text
    • https://1000families.eu/userfiles/file/65091932966.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/sunuvuwukobud.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/jajuvexegovito.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/zarejosefitusibusimoro.pdfIn PDF document text
    • http://enewind.com/pliki/file/43736158888.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/losavizidefaru.pdfIn PDF document text
    • https://technoarc.net/userfiles/file/xepejularoxamal.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/31907622912.pdfIn PDF document text
    • http://villkasz.hu/editor_up/74845239734.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/92221427607.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/fd37c1860fdf32f998e14e1bd74ce7e4/34019328879.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364a90348c7---10961450280.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16156149593f3f---58775638084.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/71037149005.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/damaxi.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614094071bf20---lijadarewisipogiz.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/16416762026.pdfIn PDF document text
    • http://cripper.de/media/zuzovebezidifafunefa.pdfIn PDF document text
    • https://ibextrail.com/editor-images/govijafesetanenaja.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/22706861774.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/63209673939.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=directions+to+trenton+train+stationPDF 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_off0000b048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB048 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC85F 10180 bytes
SHA-256: 962df4552d40bc0fb00ad92014c4c77ddfc25334d6e7a996b83ffebfe7a4c9db
font_02_sfnt_off0000df50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF50 15480 bytes
SHA-256: 70ab9689bf16df13f4bb84ea41b120b9493b0518fecb31a3c75e9f6b27b54412