Malicious PDF — malware analysis report

Static analysis result for SHA-256 e291a01f006e1df5…

MALICIOUS

PDF

79.0 KB Created: 2021-09-12 22:25:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: affc1fe7cdca5f8e0880ec9bae3ee10e SHA-1: ab8f7a9f1f68a1bb20b9209d161e63d1ceb69ad9 SHA-256: e291a01f006e1df58ac1e69d79a8c579826ee14bc7aeb9735902f56d31e25e2b
96 Risk Score

Malware Insights

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

The PDF file was flagged by an ML classifier as malicious and contains numerous embedded URLs. Several heuristics indicate that the PDF is a link farm, with many links pointing to domains that appear to be compromised or disposable hosting. The primary purpose seems to be directing users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://asiadomainstore.com/userfiles/file/romurata.pdf In PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/66278105327.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/tukasejazobosoga.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/83388250483.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/riselone.pdfIn PDF document text
    • http://jump360.co/upload/files/20210912202354.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/95342511556.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/9d8f8fe7a2e7dfcd1d0a9fbf3a25e96b/43175735319.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/96176359917.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/rixezujavij.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/67859632776.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/26209409170.pdfIn PDF document text
    • http://dobermanncz.eu/files/xawotolij.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/bupudaluxofowaveta.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131ad8abc625---xazisasadofovami.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/73516238303.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/24494852292.pdfIn PDF document text
    • http://ifap.it/images/file/90207406100.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/girakilobigitivokuvitatos.pdfIn PDF document text
    • http://sql110.com/pic/bixafosekarebugafosem.pdfIn PDF document text
    • http://dolonchem.com/upload/files/vunojajavazonedorumas.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613502f2813e2---perizag.pdfIn PDF document text
    • https://kvizek.hu/ckfinder/userfiles/files/nuxupefoxekagexurotego.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/xixunovegelugolabimuxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+root+pixel+xlPDF 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_off0000d189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD189 18004 bytes
SHA-256: a2ba8233ceadc5c6767ef545ccb65e41680369fc46e887a91882a6074f03656a
font_01_sfnt_off0000fffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFB 9992 bytes
SHA-256: 12ef6a812c083dc891a61b530b943b109df7dd809981dcd08ae3887641e917b8
font_02_sfnt_off00011636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11636 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1