Malicious PDF — malware analysis report

Static analysis result for SHA-256 80e3d6b28bc7009c…

MALICIOUS

PDF

72.5 KB Created: 2021-09-03 03:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e0a312f8b6b7fc57d071a35a25faadb8 SHA-1: 0cf9a74d0f61c054f6b6f64d4eb5b839c8a75860 SHA-256: 80e3d6b28bc7009ccd32a95e546e033fc0c4a01f5415a39a3f3c61981f89fb75
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to other PDF files hosted on various domains, many of which appear to be compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the link farm structure suggests an attempt to manipulate search engine results or distribute malicious payloads indirectly. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://ulleungroadtour.com/FileData/ckfinder/files/20210728_BF4118A1B89B5558.pdf In PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767534338f5---87489284269.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/1iau0qjl3osdc3to6hbqpddc1c/buwibetonumawe.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/11719001815.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/a4ek7vejjg8b4qk0d6l43c9lcl/30561710053.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8720a3a74---pozovurewusudiwikebomo.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/nujip.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/xizuxa.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160af7475af978---38731072214.pdfIn PDF document text
    • https://digicpictures.com/downloads/27489492072.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/53946170467.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/31c3ca6dcd4674dccf20284ba562e178/17172872178.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/sakamixozero.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/2778337135.pdfIn PDF document text
    • http://aps-mes.com/files/file/nubopezukuraxevulipofat.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/32987544817.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/posilebe.pdfIn PDF document text
    • https://hsse.cl/files/dibalevadameg.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/ponutupi.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/21655467439.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/45566785355.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/juxojuta.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/3a15a98c8bac7ebb3f61c46a64611f40/80673980119.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f70967bea---pojatu.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/jugolufanunemonilajof.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/63368948299.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=wasp+synth+manualPDF 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_off0000bc0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD422 10280 bytes
SHA-256: 6b8e3a16084d5af37997adf3e9e5dd275a6e14b9bd09b0c574a4d92bee22ad36
font_02_sfnt_off0000eb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB13 16300 bytes
SHA-256: bc221e117d487e36ff7c317f30349fdc4a464f9489220beff04f1e95b45e50b6

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