Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7ad6af624d19b4f…

MALICIOUS

PDF

76.8 KB Created: 2021-09-16 20:10:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e112a189a3d2d1d0438eb835dafe06bf SHA-1: c85b3a045c680e7e035137c309bcd11eca0b271b SHA-256: a7ad6af624d19b4f301855960211fb6ba62a7d97e941d943cfc80154c9d0fbf3
96 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to potentially compromised WordPress sites and other disposable hosting. The ML classifier strongly indicated maliciousness, and the heuristics identify it as a link farm on disposable hosting, likely intended to lure users to malicious content. No scripts were extracted, but the structure and URL distribution suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613aad8ac4671---nefokokatorijokosut.pdf In PDF document text
    • http://lamorenj.com/userfiles/file/vamuduwajetodoxe.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16137b3b347925---7944969350.pdfIn PDF document text
    • http://bojovesporty.cz/userfiles/file/zonapemukuluroganobuxise.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/zuzalajixafefinewifiveg.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/xivediniviniwos.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/41010326348.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/vasabetubexatejasagojud.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1613df14363a45---16172934341.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/vigalulomive.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/77436624298.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109131726506582.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/43079299600.pdfIn PDF document text
    • http://all-premium.com/user_file/files/65841376050.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/c85f8791f6a0644ca95cdf9af6c55bf2/4426733253.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/93504730581.pdfIn PDF document text
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/dakuzoladebu.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/8f9f740a153682977be516cb8d126ac7/zetusaguvig.pdfIn PDF document text
    • https://waelfawzy.com/userfiles/file/In PDF document text
    • https://dmshospital.com/mm_engg/files/21373945503.pdfIn PDF document text
    • https://vientangluc.com/upload/files/36633315228.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/kujudepo.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/21401093145.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/vedexawusudadoke.pdfIn PDF document text
    • http://iknow.pl/files/file/volikukubofobukakul.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/wuxifis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=play+pokemon+tower+defense+3PDF 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_off0000c511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC511 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD23 17916 bytes
SHA-256: 99b538a758bf6a9a50b949b6f645779bec4aae004bee7fbaf63cd525575c671f
font_02_sfnt_off00010b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B90 11032 bytes
SHA-256: 34db62dd5cac59f539cc756e182387652004ee2fc5611c41c67bac96c23f8751