Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffb93805d8cef408…

MALICIOUS

PDF

75.9 KB Created: 2021-09-07 15:15:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a22f8733b5f3f6d77dac6a42f14f8363 SHA-1: 6992d17dd720b683daa771b4c930fa209aad932d SHA-256: ffb93805d8cef408b81ea4d27697c5f115a17b23d9c4e4d67ee48e56ea464be1
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a common tactic of using link farms within documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://wannawwannie.pl/userfiles/file/64284722157.pdf In PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d549710b7d---lijusevenorebur.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/pokotiketerutubekewesaj.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/musazigejowabaf.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/zobotikivi.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/35826580190e9cd206f38e041fc8bfae/ralilejizagobegunaxo.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/15313252887.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/5eb46f785bd8e605300bb4ee4d750a2c/xewotimeped.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a5348e1f9b8---vesigatufanuriranixaned.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202104/file/27989361797.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/bozagilogilonoxejemitona.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/39392508031.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/57760449422.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/3127681102.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/xegos.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/2221c224664c20116a8469eadc50b89d/dafilabepuwezove.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/od4j9s9o2snpjil39uv9n6vic3/96695505709.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5604320e7---pusutofepar.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/7593218496.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/6ace842db1f653eb22094d411fb25499/61772335525.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/70332876179.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/90721234447.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=jbl+lsr305+manual+pdfPDF 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_off0000bcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F0 20336 bytes
SHA-256: 0dbf6c1566dbeb11392796b4e7aaad2952640e5217b1f70656ba1fcbdd81884b
font_02_sfnt_off0001091b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091B 10876 bytes
SHA-256: 91f9c8c6d8bd3c282e3ca33c4e0eae266c2361a1c196699ae37518a3ab512795

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