Malicious PDF — malware analysis report

Static analysis result for SHA-256 48a8aa649e01f959…

MALICIOUS

PDF

95.4 KB Created: 2021-07-08 10:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6664f524a1ac15f754d27841661a6e87 SHA-1: ff494bd781fde09f2d205a5e62e0e7fc1358e8b0 SHA-256: 48a8aa649e01f9590abbedb8fe4b92117f34e31f752343bb7d7e68f1f823af8a
96 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the presence of multiple external URIs and link farm heuristics supports a pattern of luring users to potentially harmful content. No scripts were extracted, limiting the analysis to the document structure and embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://nomylo.ru/uplcv?utm_term=stomach+flu+meaning
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/n062vf569i3v2ajslqdvl5i4h7/59012363105.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb106ec97fb---gafidufivo.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160871dba66bd4---lelakitefig.pdf
    • http://accessiblevehicleservices.com/userfiles/file/99613585577.pdf
    • http://hoadondientu-ptp.vn/images/ckeditor/files/29177116803.pdf
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/70332360572.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbb54a361cd---bajabavujabi.pdf
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/32cac99ec2cd3ac36ffab05b90d3d779/sijajometapa.pdf
    • http://yngc.ru/admin/ckfinder/userfiles/files/34851380731.pdf
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/xavogi.pdf
    • http://9meclinic.com/ckfinder/userfiles/files/fezoz.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/2ld20c9om9cle5udvttjf6mtqj/zovuginupatumos.pdf
    • https://mondialardesia.it/file/pewajofakar.pdf
    • https://www.alapan.org/fckimages/file/fagekuvomabom.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1c17816d1---48655933753.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609479e95e58d---35022247750.pdf
    • http://capmar.eu/userfiles/file/vogudonilefovisalaboludop.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a61d43762a6---gofuxezes.pdf
    • https://10glazsikeyrosa.ru/file/mowivibelegebunowis.pdf
    • http://arcomproltd.com/userfiles/file/gebepedorataruko.pdf
    • https://inverpalmas.site/aym_image/files/debuvomem.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/a19caf1830fae38bb9b1c8d37cf7079b/30460198379.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b290673c5aa---52540269141.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001117c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1117C 16792 bytes
font_01_sfnt_off00012993.bin
d63b4fa267ec38861919fbbd2edc179f961affcc9ac9f6a5e5b08fe7977ba889
pdf-font-stream PDF embedded font (sfnt) at offset 0x12993 10692 bytes
font_02_sfnt_off000141e8.bin
a18745e3f1b49ffa9625d6eda08fa5d824f703d6f0da8ea8233b8b6d188d0126
pdf-font-stream PDF embedded font (sfnt) at offset 0x141E8 17224 bytes